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boost-1.33
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@@ -1,2 +1,2 @@
|
||||
bin*
|
||||
*.pdb
|
||||
*.pdb
|
||||
|
||||
137
build/Jamfile
137
build/Jamfile
@@ -1,20 +1,18 @@
|
||||
# (C) Copyright William E. Kempf 2001. Permission to copy, use, modify,
|
||||
# sell and distribute this software is granted provided this copyright
|
||||
# notice appears in all copies. This software is provided "as is" without
|
||||
# express or implied warranty, and with no claim as to its suitability for
|
||||
# any purpose.
|
||||
# Copyright (C) 2001-2003
|
||||
# William E. Kempf
|
||||
#
|
||||
# Permission to use, copy, modify, distribute and sell this software
|
||||
# and its documentation for any purpose is hereby granted without fee,
|
||||
# provided that the above copyright notice appear in all copies and
|
||||
# that both that copyright notice and this permission notice appear
|
||||
# in supporting documentation. William E. Kempf makes no representations
|
||||
# about the suitability of this software for any purpose.
|
||||
# It is provided "as is" without express or implied warranty.
|
||||
#
|
||||
# Boost.Threads build Jamfile
|
||||
#
|
||||
# Additional configuration variables used:
|
||||
# 1. PTW32 may be used on Win32 platforms to specify that the pthreads-win32
|
||||
# library should be used instead of "native" threads. This feature is
|
||||
# mostly used for testing and it's generally recommended you use the
|
||||
# native threading libraries instead. PTW32 should be set to be a list
|
||||
# of two strings, the first specifying the installation path of the
|
||||
# pthreads-win32 library and the second specifying which library
|
||||
# variant to link against (see the pthreads-win32 documentation).
|
||||
# Example: jam -sPTW32="c:\pthreads-win32 pthreadVCE.lib"
|
||||
# See threads.jam.
|
||||
|
||||
# Declare the location of this subproject relative to the root.
|
||||
subproject libs/thread/build ;
|
||||
@@ -22,32 +20,107 @@ subproject libs/thread/build ;
|
||||
# Include threads.jam for Boost.Threads global build information.
|
||||
# This greatly simplifies the Jam code needed to configure the build
|
||||
# for the various Win32 build types.
|
||||
SEARCH on <module@>threads.jam = $(SUBDIR) ;
|
||||
include <module@>threads.jam ;
|
||||
import ./threads ;
|
||||
|
||||
{
|
||||
template thread_libs
|
||||
## sources ##
|
||||
: <template>thread_base
|
||||
## requirements ##
|
||||
:
|
||||
## default build ##
|
||||
: debug release
|
||||
CPP_SOURCES =
|
||||
barrier
|
||||
condition
|
||||
exceptions
|
||||
mutex
|
||||
once
|
||||
recursive_mutex
|
||||
thread
|
||||
tss_hooks
|
||||
tss_dll
|
||||
tss_pe
|
||||
tss
|
||||
xtime
|
||||
;
|
||||
|
||||
template boost_thread_lib_base
|
||||
: ## sources ##
|
||||
<template>thread_base
|
||||
../src/$(CPP_SOURCES).cpp
|
||||
: ## requirements ##
|
||||
<sysinclude>$(BOOST_ROOT) #:should be unnecessary (because already included in thread_base)
|
||||
<define>BOOST_THREAD_BUILD_LIB=1
|
||||
# the common names rule ensures that the library will
|
||||
# be named according to the rules used by the install
|
||||
# and auto-link features:
|
||||
common-variant-tag
|
||||
: ## default build ##
|
||||
;
|
||||
|
||||
# Base names of the source files for libboost_thread.
|
||||
CPP_SOURCES = condition mutex recursive_mutex thread tss xtime once
|
||||
exceptions threadmon ;
|
||||
template boost_thread_dll_base
|
||||
: ## sources ##
|
||||
<template>thread_base
|
||||
../src/$(CPP_SOURCES).cpp
|
||||
: ## requirements ##
|
||||
<sysinclude>$(BOOST_ROOT) #:should be unnecessary (because already included in thread_base)
|
||||
<define>BOOST_THREAD_BUILD_DLL=1
|
||||
<runtime-link>dynamic
|
||||
# the common names rule ensures that the library will
|
||||
# be named according to the rules used by the install
|
||||
# and auto-link features:
|
||||
common-variant-tag
|
||||
: ## default build ##
|
||||
;
|
||||
|
||||
dll boost_thread
|
||||
: <template>thread_libs ../src/$(CPP_SOURCES).cpp
|
||||
: <define>BOOST_THREAD_BUILD_DLL=1
|
||||
lib $(boost_thread_lib_name)
|
||||
: ## sources ##
|
||||
<template>boost_thread_lib_base
|
||||
: ## requirements ##
|
||||
<define>BOOST_THREAD_LIB_NAME=$(boost_thread_lib_name)
|
||||
: ## default build ##
|
||||
;
|
||||
|
||||
dll $(boost_thread_lib_name)
|
||||
: ## sources ##
|
||||
<template>boost_thread_dll_base
|
||||
: ## requirements ##
|
||||
<define>BOOST_THREAD_LIB_NAME=$(boost_thread_lib_name)
|
||||
: ## default build ##
|
||||
;
|
||||
|
||||
stage bin-stage
|
||||
: <dll>boost_thread
|
||||
: #<tag><runtime-link-static>"s"
|
||||
<tag><debug>"d"
|
||||
: debug release
|
||||
: <dll>$(boost_thread_lib_name)
|
||||
<lib>$(boost_thread_lib_name)
|
||||
;
|
||||
|
||||
install thread lib
|
||||
: <dll>$(boost_thread_lib_name)
|
||||
<lib>$(boost_thread_lib_name)
|
||||
;
|
||||
|
||||
if $(boost_thread_lib_settings_ptw32)
|
||||
{
|
||||
lib $(boost_thread_lib_name_ptw32)
|
||||
: ## sources ##
|
||||
<template>boost_thread_lib_base
|
||||
: ## requirements ##
|
||||
<define>BOOST_THREAD_LIB_NAME=$(boost_thread_lib_name_ptw32)
|
||||
$(boost_thread_lib_settings_ptw32)
|
||||
: ## default build ##
|
||||
;
|
||||
|
||||
dll $(boost_thread_lib_name_ptw32)
|
||||
: ## sources ##
|
||||
<template>boost_thread_dll_base
|
||||
: ## requirements ##
|
||||
<define>BOOST_THREAD_LIB_NAME=$(boost_thread_lib_name_ptw32)
|
||||
$(boost_thread_lib_settings_ptw32)
|
||||
: ## default build ##
|
||||
;
|
||||
|
||||
stage bin-stage
|
||||
: <dll>$(boost_thread_lib_name_ptw32)
|
||||
<lib>$(boost_thread_lib_name_ptw32)
|
||||
;
|
||||
|
||||
install thread lib
|
||||
: <dll>$(boost_thread_lib_name_ptw32)
|
||||
<lib>$(boost_thread_lib_name_ptw32)
|
||||
;
|
||||
}
|
||||
}
|
||||
|
||||
@@ -1,12 +1,26 @@
|
||||
import os ;
|
||||
|
||||
# Declare the uses system library
|
||||
lib pthread : : <name>pthread ;
|
||||
if [ os.name ] = NT
|
||||
{
|
||||
reqts = <link>shared:<define>BOOST_THREAD_BUILD_DLL=1 ;
|
||||
}
|
||||
else
|
||||
{
|
||||
# Declare the uses system library
|
||||
lib pthread : : <name>pthread ;
|
||||
usage = <library>pthread ;
|
||||
}
|
||||
|
||||
project boost/thread
|
||||
: source-location ../src
|
||||
: usage-requirements <library>pthread
|
||||
: usage-requirements $(usage)
|
||||
: requirements $(reqts) <threading>multi
|
||||
: default-build <threading>multi
|
||||
;
|
||||
|
||||
CPP_SOURCES = condition mutex recursive_mutex thread tss xtime once exceptions ;
|
||||
CPP_SOURCES = condition mutex recursive_mutex thread xtime once
|
||||
exceptions barrier tss tss_hooks tss_dll tss_pe ;
|
||||
|
||||
lib boost_thread : $(CPP_SOURCES).cpp ;
|
||||
lib boost_thread
|
||||
: $(CPP_SOURCES).cpp
|
||||
;
|
||||
|
||||
@@ -1,28 +1,70 @@
|
||||
# Copyright (C) 2001-2003
|
||||
# William E. Kempf
|
||||
#
|
||||
# Permission to use, copy, modify, distribute and sell this software
|
||||
# and its documentation for any purpose is hereby granted without fee,
|
||||
# provided that the above copyright notice appear in all copies and
|
||||
# that both that copyright notice and this permission notice appear
|
||||
# in supporting documentation. William E. Kempf makes no representations
|
||||
# about the suitability of this software for any purpose.
|
||||
# It is provided "as is" without express or implied warranty.
|
||||
|
||||
# Additional configuration variables used:
|
||||
# 1. PTW32_DIR and PTW32_LIB may be used on Win32 platforms to specify that
|
||||
# a version of Boost.Threads should be built that uses the
|
||||
# the pthreads-win32 library instead of the Win32 native threading APIs.
|
||||
# This feature is mostly used for testing and it's generally recommended
|
||||
# that you use the Win32 native threading libraries instead.
|
||||
#
|
||||
# PTW32_Dir should be set to the installation path of the
|
||||
# pthreads-win32 library and PTW32_LIB should be set to the name of the
|
||||
# library variant to link against (see the pthreads-win32 documentation).
|
||||
# Example: jam -sPTW32_DIR="c:\pthreads-win32" -sPTW32_LIB="pthreadVCE.lib"
|
||||
# Alternately, environment variables having the names PTW32_DIR and PTW32_LIB
|
||||
# can be set instead of passing these values on the command line.
|
||||
#
|
||||
# In either case, libraries having the names boost_thread_ptw32<tags>.dll
|
||||
# and libboost_thread_ptw32<tags>.lib will be built
|
||||
# in addition to the usual boost_thread<tags>.dll and
|
||||
# libboost_thread<tags>.lib. Link with one of the ptw32 versions
|
||||
# of the Boost.Threads libraries to use the version of Boost.Threads
|
||||
# that is implemented using pthreads-win32 (you will need to #define
|
||||
# BOOST_THREAD_NO_LIB or BOOST_ALL_NO_LIB to disable auto-linking
|
||||
# if your platform supports auto-linking in order to prevent
|
||||
# your build from attempting to link to two different versions of
|
||||
# the Boost.Threads library).
|
||||
|
||||
# Do some OS-specific setup
|
||||
{
|
||||
pthreads-win32 = ;
|
||||
|
||||
#thread library name
|
||||
boost_thread_lib_name = boost_thread ;
|
||||
|
||||
#thread library name with "pthreads-win32" library
|
||||
boost_thread_lib_name_ptw32 = boost_thread_ptw32 ;
|
||||
|
||||
if $(NT)
|
||||
{
|
||||
if $(PTW32)
|
||||
if $(PTW32_DIR)
|
||||
{
|
||||
local install-path = $(PTW32[1]) ;
|
||||
local lib = $(PTW32[2]) ;
|
||||
pthreads-win32 =
|
||||
<define>BOOST_HAS_PTHREADS
|
||||
<define>PtW32NoCatchWarn
|
||||
<include>$(install-path)/pre-built/include
|
||||
<library-file>$(install-path)/pre-built/lib/$(lib)
|
||||
;
|
||||
if $(PTW32_LIB)
|
||||
{
|
||||
boost_thread_lib_settings_ptw32 =
|
||||
<define>BOOST_HAS_PTHREADS
|
||||
<define>PtW32NoCatchWarn
|
||||
<include>$(PTW32_DIR)/pre-built/include
|
||||
<library-file>$(PTW32_DIR)/pre-built/lib/$(PTW32_LIB)
|
||||
;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
template thread_base
|
||||
## sources ##
|
||||
:
|
||||
## requirements ##
|
||||
: <sysinclude>$(BOOST_ROOT) <threading>multi $(pthreads-win32)
|
||||
## default build ##
|
||||
:
|
||||
: ## sources ##
|
||||
: ## requirements ##
|
||||
<sysinclude>$(BOOST_ROOT)
|
||||
<threading>multi
|
||||
<borland><*><cxxflags>-w-8004
|
||||
<borland><*><cxxflags>-w-8057
|
||||
: ## default build ##
|
||||
;
|
||||
}
|
||||
}
|
||||
|
||||
6
doc/Jamfile.v2
Normal file
6
doc/Jamfile.v2
Normal file
@@ -0,0 +1,6 @@
|
||||
|
||||
import toolset ;
|
||||
toolset.using doxygen ;
|
||||
|
||||
boostbook thread : thread.xml ;
|
||||
|
||||
58
doc/acknowledgements.xml
Normal file
58
doc/acknowledgements.xml
Normal file
@@ -0,0 +1,58 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<section id="thread.acknowledgements"
|
||||
last-revision="$Date$">
|
||||
<title>Acknowledgements</title>
|
||||
<para>William E. Kempf was the architect, designer, and implementor of
|
||||
&Boost.Threads;.</para>
|
||||
<para>Mac OS Carbon implementation written by Mac Murrett.</para>
|
||||
<para>Dave Moore provided initial submissions and further comments on the
|
||||
<code>barrier</code>
|
||||
and
|
||||
<code>thread_pool</code>
|
||||
classes.</para>
|
||||
<para>Important contributions were also made by Jeremy Siek (lots of input
|
||||
on the design and on the implementation), Alexander Terekhov (lots of input
|
||||
on the Win32 implementation, especially in regards to boost::condition, as
|
||||
well as a lot of explanation of POSIX behavior), Greg Colvin (lots of input
|
||||
on the design), Paul Mclachlan, Thomas Matelich and Iain Hanson (for help
|
||||
in trying to get the build to work on other platforms), and Kevin S. Van
|
||||
Horn (for several updates/corrections to the documentation).</para>
|
||||
<para>Mike Glassford finished changes to &Boost.Threads; that were begun
|
||||
by William Kempf and moved them into the main CVS branch.
|
||||
He also addressed a number of issues that were brought up on the Boost
|
||||
developer's mailing list and provided some additions and changes to the
|
||||
read_write_mutex and related classes.</para>
|
||||
<para>The documentation was written by William E. Kempf. Beman Dawes
|
||||
provided additional documentation material and editing.
|
||||
Mike Glassford finished William Kempf's conversion of the documentation to
|
||||
BoostBook format and added a number of new sections.</para>
|
||||
<para>Discussions on the boost.org mailing list were essential in the
|
||||
development of &Boost.Threads;
|
||||
. As of August 1, 2001, participants included Alan Griffiths, Albrecht
|
||||
Fritzsche, Aleksey Gurtovoy, Alexander Terekhov, Andrew Green, Andy Sawyer,
|
||||
Asger Alstrup Nielsen, Beman Dawes, Bill Klein, Bill Rutiser, Bill Wade,
|
||||
Branko èibej, Brent Verner, Craig Henderson, Csaba Szepesvari,
|
||||
Dale Peakall, Damian Dixon, Dan Nuffer, Darryl Green, Daryle Walker, David
|
||||
Abrahams, David Allan Finch, Dejan Jelovic, Dietmar Kuehl, Douglas Gregor,
|
||||
Duncan Harris, Ed Brey, Eric Swanson, Eugene Karpachov, Fabrice Truillot,
|
||||
Frank Gerlach, Gary Powell, Gernot Neppert, Geurt Vos, Ghazi Ramadan, Greg
|
||||
Colvin, Gregory Seidman, HYS, Iain Hanson, Ian Bruntlett, J Panzer, Jeff
|
||||
Garland, Jeff Paquette, Jens Maurer, Jeremy Siek, Jesse Jones, Joe Gottman,
|
||||
John (EBo) David, John Bandela, John Maddock, John Max Skaller, John
|
||||
Panzer, Jon Jagger , Karl Nelson, Kevlin Henney, KG Chandrasekhar, Levente
|
||||
Farkas, Lie-Quan Lee, Lois Goldthwaite, Luis Pedro Coelho, Marc Girod, Mark
|
||||
A. Borgerding, Mark Rodgers, Marshall Clow, Matthew Austern, Matthew Hurd,
|
||||
Michael D. Crawford, Michael H. Cox , Mike Haller, Miki Jovanovic, Nathan
|
||||
Myers, Paul Moore, Pavel Cisler, Peter Dimov, Petr Kocmid, Philip Nash,
|
||||
Rainer Deyke, Reid Sweatman, Ross Smith, Scott McCaskill, Shalom Reich,
|
||||
Steve Cleary, Steven Kirk, Thomas Holenstein, Thomas Matelich, Trevor
|
||||
Perrin, Valentin Bonnard, Vesa Karvonen, Wayne Miller, and William
|
||||
Kempf.</para>
|
||||
<para>Apologies for anyone inadvertently missed.</para>
|
||||
</section>
|
||||
|
||||
@@ -1,69 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - Acknowledgments</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Acknowledgments</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<p><a href="../../../people/william_kempf.htm">William E. Kempf</a> was the architect,
|
||||
designer, and implementor of <b>Boost.Threads</b>.</p>
|
||||
<p>Mac OS Carbon implementation written by <a href="../../../people/mac_murrett.htm">Mac
|
||||
Murrett</a>.</p>
|
||||
<p>Important contributions were also made by Jeremy Siek (lots of input on the
|
||||
design and on the implementation), Alexander Terekhov (lots of input on the
|
||||
Win32 implementation, especially in regards to boost::condition, as well as
|
||||
a lot of explanation of POSIX behavior), Greg Colvin (lots of input on the design),
|
||||
Paul Mclachlan, Thomas Matelich and Iain Hanson (for help in trying to get the
|
||||
build to work on other platforms), and Kevin S. Van Horn (for several updates/corrections
|
||||
to the documentation).</p>
|
||||
<p>The documentation was written by William E. Kempf. Beman Dawes provided additional
|
||||
documentation material and editing.</p>
|
||||
<p>Discussions on the boost.org mailing list were essential in the development
|
||||
of <b>Boost.Threads</b>. As of August 1, 2001, participants included Alan Griffiths,
|
||||
Albrecht Fritzsche, Aleksey Gurtovoy, Alexander Terekhov, Andrew Green, Andy
|
||||
Sawyer, Asger Alstrup Nielsen, Beman Dawes, Bill Klein, Bill Rutiser, Bill Wade,
|
||||
Branko Èibej, Brent Verner, Craig Henderson, Csaba Szepesvari, Dale Peakall,
|
||||
Damian Dixon, Dan Nuffer, Darryl Green, Daryle Walker, David Abrahams, David
|
||||
Allan Finch, Dejan Jelovic, Dietmar Kuehl, Doug Gregor, Douglas Gregor, Duncan
|
||||
Harris, Ed Brey, Eric Swanson, Eugene Karpachov, Fabrice Truillot, Frank Gerlach,
|
||||
Gary Powell, Gernot Neppert, Geurt Vos, Ghazi Ramadan, Greg Colvin, Gregory
|
||||
Seidman, HYS, Iain Hanson, Ian Bruntlett, J Panzer, Jeff Garland, Jeff Paquette,
|
||||
Jens Maurer, Jeremy Siek, Jesse Jones, Joe Gottman, John (EBo) David, John Bandela,
|
||||
John Maddock, John Max Skaller, John Panzer, Jon Jagger , Karl Nelson, Kevlin
|
||||
Henney, KG Chandrasekhar, Levente Farkas, Lie-Quan Lee, Lois Goldthwaite, Luis
|
||||
Pedro Coelho, Marc Girod, Mark A. Borgerding, Mark Rodgers, Marshall Clow, Matthew
|
||||
Austern, Matthew Hurd, Michael D. Crawford, Michael H. Cox , Mike Haller, Miki
|
||||
Jovanovic, Nathan Myers, Paul Moore, Pavel Cisler, Peter Dimov, Petr Kocmid,
|
||||
Philip Nash, Rainer Deyke, Reid Sweatman, Ross Smith, Scott McCaskill, Shalom
|
||||
Reich , Steve Cleary, Steven Kirk, Thomas Holenstein, Thomas Matelich, Trevor
|
||||
Perrin, Valentin Bonnard, Vesa Karvonen, Wayne Miller, and William Kempf.</p>
|
||||
<p>Apologies for anyone inadvertently missed.</p>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2001
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
78
doc/barrier-ref.xml
Normal file
78
doc/barrier-ref.xml
Normal file
@@ -0,0 +1,78 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<header name="boost/thread/barrier.hpp"
|
||||
last-revision="$Date$">
|
||||
<namespace name="boost">
|
||||
<class name="barrier">
|
||||
<inherit access="private">
|
||||
<type><classname>boost::noncopyable</classname></type>
|
||||
<purpose>Exposition only</purpose>
|
||||
</inherit>
|
||||
|
||||
<purpose>
|
||||
<para>An object of class <classname>barrier</classname> is a synchronization
|
||||
primitive used to cause a set of threads to wait until they each perform a
|
||||
certain function or each reach a particular point in their execution.</para>
|
||||
</purpose>
|
||||
|
||||
<description>
|
||||
<para>When a barrier is created, it is initialized with a thread count N.
|
||||
The first N-1 calls to <code>wait()</code> will all cause their threads to be blocked.
|
||||
The Nth call to <code>wait()</code> will allow all of the waiting threads, including
|
||||
the Nth thread, to be placed in a ready state. The Nth call will also "reset"
|
||||
the barrier such that, if an additional N+1th call is made to <code>wait()</code>,
|
||||
it will be as though this were the first call to <code>wait()</code>; in other
|
||||
words, the N+1th to 2N-1th calls to <code>wait()</code> will cause their
|
||||
threads to be blocked, and the 2Nth call to <code>wait()</code> will allow all of
|
||||
the waiting threads, including the 2Nth thread, to be placed in a ready state
|
||||
and reset the barrier. This functionality allows the same set of N threads to re-use
|
||||
a barrier object to synchronize their execution at multiple points during their
|
||||
execution.</para>
|
||||
<para>See <xref linkend="threads.glossary"/> for definitions of thread
|
||||
states <link linkend="threads.glossary.thread-state">blocked</link>
|
||||
and <link linkend="threads.glossary.thread-state">ready</link>.
|
||||
Note that "waiting" is a synonym for blocked.</para>
|
||||
</description>
|
||||
|
||||
<constructor>
|
||||
<parameter name="count">
|
||||
<paramtype>size_t</paramtype>
|
||||
</parameter>
|
||||
|
||||
<effects><simpara>Constructs a <classname>barrier</classname> object that
|
||||
will cause <code>count</code> threads to block on a call to <code>wait()</code>.
|
||||
</simpara></effects>
|
||||
</constructor>
|
||||
|
||||
<destructor>
|
||||
<effects><simpara>Destroys <code>*this</code>. If threads are still executing
|
||||
their <code>wait()</code> operations, the behavior for these threads is undefined.
|
||||
</simpara></effects>
|
||||
</destructor>
|
||||
|
||||
<method-group name="waiting">
|
||||
<method name="wait">
|
||||
<type>bool</type>
|
||||
|
||||
<effects><simpara>Wait until N threads call <code>wait()</code>, where
|
||||
N equals the <code>count</code> provided to the constructor for the
|
||||
barrier object.</simpara>
|
||||
<simpara><emphasis role="bold">Note</emphasis> that if the barrier is
|
||||
destroyed before <code>wait()</code> can return, the behavior is
|
||||
undefined.</simpara></effects>
|
||||
|
||||
<returns>Exactly one of the N threads will receive a return value
|
||||
of <code>true</code>, the others will receive a value of <code>false</code>.
|
||||
Precisely which thread receives the return value of <code>true</code> will
|
||||
be implementation-defined. Applications can use this value to designate one
|
||||
thread as a leader that will take a certain action, and the other threads
|
||||
emerging from the barrier can wait for that action to take place.</returns>
|
||||
</method>
|
||||
</method-group>
|
||||
</class>
|
||||
</namespace>
|
||||
</header>
|
||||
@@ -1,165 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - Bibliography</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Bibliography</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<table summary="Bibliography" border="0" cellpadding="5" width="777">
|
||||
<tr>
|
||||
<td width="102" valign="top" align="left"><b>[<a name=
|
||||
"Andrews-83">Andrews 83</a>]</b></td>
|
||||
<td width="645"> Gregory R. Andrews, Fred B. Schneider, <cite>Concepts and
|
||||
Notations for Concurrent Programming</cite>, ACM Computing Surveys, Vol.
|
||||
15, No. 1, March, 1983. <a href=
|
||||
"http://www.acm.org/pubs/citations/journals/surveys/1983-15-1/p3-andrews/">
|
||||
http://www.acm.org/pubs/citations/journals/surveys/1983-15-1/p3-andrews/</a>
|
||||
<p>Good general background reading. Includes descriptions of Path Expressions,
|
||||
Message Passing, and Remote Procedure Call in addition to the basics.</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td width="102" valign="top" align="left"><b>[<a name=
|
||||
"Boost">Boost</a>]</b></td>
|
||||
<td width="645"> The <cite>Boost</cite> worldwide web site. <a href=
|
||||
"http://www.boost.org">http://www.boost.org</a>
|
||||
<p>Boost.Threads is one of many Boost libraries. The Boost web site includes
|
||||
a great deal of documentation and general information which applies to
|
||||
all Boost libraries. Current copies of the libraries including documentation
|
||||
and test programs may be downloaded from the web site.</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td width="102" valign="top" align="left"><b>[<a name=
|
||||
"Brinch-Hansen-73">Brinch Hansen 73</a>]</b></td>
|
||||
<td width="645"> Per Brinch Hansen, <cite>Concurrent Programming Concepts</cite>,
|
||||
ACM Computing Surveys, Vol. 5, No. 4, December, 1973. <a href=
|
||||
"http://www.acm.org/pubs/articles/journals/surveys/1973-5-4/p223-hansen/p223-hansen.pdf">
|
||||
http://www.acm.org/pubs/articles/journals/surveys/1973-5-4/p223-hansen/</a>
|
||||
<p>"This paper describes the evolution of language features for multiprogramming
|
||||
from event queues and semaphores to critical regions and monitors."
|
||||
Includes analysis of why <i>events</i> are considered error-prone. Also
|
||||
noteworthy because of an introductory quotation from Christopher Alexander;
|
||||
Brinch Hansen was years ahead of others in recognizing pattern concepts
|
||||
applied to software too.</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td width="102" valign="top" align="left"><b>]<a name=
|
||||
"Butenhof-97">Butenhof 97</a>]</b></td>
|
||||
<td width="645">
|
||||
<p>David R. Butenhof, <cite>Programming with POSIX Threads</cite>, Addison-Wesley
|
||||
1997, ISBN 0-201-63392-2 <a
|
||||
href="http://cseng.aw.com/book/0,3828,0201633922,00.html">
|
||||
http://cseng.aw.com/book/0,3828,0201633922,00.html</a></p>
|
||||
<p>This is a very readable explanation of threads and how to use them. Many
|
||||
of the insights given apply to all multithreaded programming, not just
|
||||
POSIX Threads.</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td width="102" valign="top" align="left"><b>[<a name=
|
||||
"Hoare-74">Hoare 74</a>]</b></td>
|
||||
<td width="645">
|
||||
<p>C.A.R Hoare, <cite>Monitors: An Operating System Structuring Concept</cite>,
|
||||
Communications of the ACM, Vol. 17, No. 10. October 1974, pp. 549-557
|
||||
<a href=
|
||||
"http://www.acm.org/classics/feb96/"> http://www.acm.org/classics/feb96/</a></p>
|
||||
<p>Hoare and Brinch Hansen's work on Monitors is the basis for reliable
|
||||
multithreading patterns. This is one of the most often referenced papers
|
||||
in all of computer science, and with good reason.</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td width="102" valign="top" align="left"><b>[<a name=
|
||||
"ISO-98">ISO 98</a>]</b></td>
|
||||
<td width="645">
|
||||
<p>ISO/IEC 14882:1998(E) <cite>Programming Language C++</cite> <a href="http://www.ansi.org">
|
||||
http://www.ansi.org</a></p>
|
||||
<p>This is the official C++ Standards document. Available from the ANSI
|
||||
(American National Standards Institute) Electronic Standards Store.</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td width="102" valign="top" align="left"><b>[<a name=
|
||||
"McDowell-89">McDowell 89</a>]</b></td>
|
||||
<td width="645"> Charles E McDowell, David P. Helmbold, <cite>Debugging Concurrent
|
||||
Programs</cite>, ACM Computing Surveys, Vol. 21, No. 2, December, 1989.
|
||||
<a href=
|
||||
"http://www.acm.org/pubs/citations/journals/surveys/1989-21-4/p593-mcdowell/">
|
||||
http://www.acm.org/pubs/citations/journals/surveys/1989-21-4/p593-mcdowell/</a>
|
||||
<p>Identifies many of the unique failure modes and debugging difficulties
|
||||
associated with concurrent programs.</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td width="102" valign="top" align="left"><b>[<a name=
|
||||
"Schmidt">Schmidt</a>]</b> </td>
|
||||
<td width="645">
|
||||
<p>Douglas C. Schmidt and Irfan Pyarali, <cite>Strategies for Implementing
|
||||
POSIX Condition Variables on Win32</cite>, Department of Computer Science,
|
||||
Washington University, St. Louis, Missouri. <a href=
|
||||
"http://www.cs.wustl.edu/~schmidt/win32-cv-1.html"> http://www.cs.wustl.edu/~schmidt/win32-cv-1.html</a></p>
|
||||
<p>Rationale for understanding Boost.Threads condition variables. Note that
|
||||
Alexander Terekhov found some bugs in the implementation given in this
|
||||
article, so pthreads-win32 and Boost.Threads are even more complicated
|
||||
yet.</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td width="102" valign="top" align="left"><b>[<a name=
|
||||
"Schmidt-00">Schmidt 00</a>]</b> </td>
|
||||
<td width="645">
|
||||
<p>Douglas C. Schmidt, Michael Stal, Hans Rohnert and Frank Buschmann, <cite>Pattern-Oriented
|
||||
Software Architecture Volume 2 - Patterns for Concurrent and Networked
|
||||
Objects</cite>, Wiley 2000, ISBN 0-471-60695-2 <a href=
|
||||
"http://www.wiley.com/Corporate/Website/Objects/Products/0,9049,104671,00.html">
|
||||
http://www.wiley.com/Corporate/Website/Objects/Products/0,9049,104671,00.html</a></p>
|
||||
<p>This is a very good explanation of how to apply several patterns useful
|
||||
for concurrent programming. Among the patterns documented is the Monitor
|
||||
Pattern mentioned frequently in the <b>Boost.Threads</b> documentation.</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td width="102" valign="top" align="left"><b>[<a name=
|
||||
"Stroustrup-00">Stroustrup 00</a>]</b></td>
|
||||
<td width="645"> Bjarne Stroustrup, <cite>The C++ Programming Language</cite>,
|
||||
Special Edition, Addison-Wesley 2000, ISBN 0-201-70073-5 <a href=
|
||||
"http://cseng.aw.com/book/0,3828,0201700735,00.html"> http://cseng.aw.com/book/0,3828,0201700735,00.html</a>
|
||||
<p>The first book a C++ programmer should own. Note that the 3rd edition
|
||||
(and subsequent editions like the Special Edition) has been rewritten
|
||||
to cover the ISO standard language and library.</p>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<p>Note: The URL's above are provided in plain text form so that they will
|
||||
be visible on printed copies of this document.</p>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2001
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> and
|
||||
Beman Dawes 2001-2002. All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
230
doc/bibliography.xml
Normal file
230
doc/bibliography.xml
Normal file
@@ -0,0 +1,230 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<bibliography id="threads.bibliography"
|
||||
last-revision="$Date$">
|
||||
<title>Bibliography</title>
|
||||
<biblioentry id="threads.bib.AndrewsSchneider83">
|
||||
<abbrev id="threads.bib.AndrewsSchneider83.abbrev">AndrewsSchnieder83</abbrev>
|
||||
<biblioset relation="journal">
|
||||
<title>ACM Computing Surveys</title>
|
||||
<volumenum>Vol. 15</volumenum>
|
||||
<issuenum>No. 1</issuenum>
|
||||
<date>March, 1983</date>
|
||||
</biblioset>
|
||||
<biblioset relation="article">
|
||||
<authorgroup>
|
||||
<author>
|
||||
<firstname>Gregory</firstname>
|
||||
<othername>R.</othername>
|
||||
<surname>Andrews</surname>
|
||||
</author>
|
||||
<author>
|
||||
<firstname>Fred</firstname>
|
||||
<othername>B.</othername>
|
||||
<surname>Schneider</surname>
|
||||
</author>
|
||||
</authorgroup>
|
||||
<title>
|
||||
<ulink
|
||||
url="http://www.acm.org/pubs/citations/journals/surveys/1983-15-1/p3-andrews/"
|
||||
>Concepts and Notations for Concurrent Programming</ulink>
|
||||
</title>
|
||||
</biblioset>
|
||||
<para>Good general background reading. Includes descriptions of Path
|
||||
Expressions, Message Passing, and Remote Procedure Call in addition to the
|
||||
basics</para>
|
||||
</biblioentry>
|
||||
<biblioentry id="threads.bib.Boost">
|
||||
<abbrev id="threads.bib.Boost.abbrev">Boost</abbrev>
|
||||
<bibliomisc>The <emphasis>Boost</emphasis> world wide web site.
|
||||
<ulink url="http:/www.boost.org">http://www.boost.org</ulink></bibliomisc>
|
||||
<para>&Boost.Threads; is one of many Boost libraries. The Boost web
|
||||
site includes a great deal of documentation and general information which
|
||||
applies to all Boost libraries. Current copies of the libraries including
|
||||
documentation and test programs may be downloaded from the web
|
||||
site.</para>
|
||||
</biblioentry>
|
||||
<biblioentry id="threads.bib.Hansen73">
|
||||
<abbrev id="threads.bib.Hansen73.abbrev">Hansen73</abbrev>
|
||||
<biblioset relation="journal">
|
||||
<title>ACM Computing Surveys</title>
|
||||
<volumenum>Vol. 5</volumenum>
|
||||
<issuenum>No. 4</issuenum>
|
||||
<date>December, 1973</date>
|
||||
</biblioset>
|
||||
<biblioset relation="article">
|
||||
<author>0-201-63392-2
|
||||
<firstname>Per Brinch</firstname>
|
||||
<lastname>Hansen</lastname>
|
||||
</author>
|
||||
<title>
|
||||
<ulink
|
||||
url="http://www.acm.org/pubs/articles/journals/surveys/1973-5-4/p223-hansen/"
|
||||
>Concurrent Programming Concepts</ulink>
|
||||
</title>
|
||||
</biblioset>
|
||||
<para>"This paper describes the evolution of language features for
|
||||
multiprogramming from event queues and semaphores to critical regions and
|
||||
monitors." Includes analysis of why events are considered error-prone. Also
|
||||
noteworthy because of an introductory quotation from Christopher Alexander;
|
||||
Brinch Hansen was years ahead of others in recognizing pattern concepts
|
||||
applied to software, too.</para>
|
||||
</biblioentry>
|
||||
<biblioentry id="threads.bib.Butenhof97">
|
||||
<abbrev id="threads.bib.Butenhof97.abbrev">Butenhof97</abbrev>
|
||||
<title>
|
||||
<ulink url="http://cseng.aw.com/book/0,3828,0201633922,00.html"
|
||||
>Programming with POSIX Threads </ulink>
|
||||
</title>
|
||||
<author>
|
||||
<firstname>David</firstname>
|
||||
<othername>R.</othername>
|
||||
<surname>Butenhof</surname>
|
||||
</author>
|
||||
<publisher>Addison-Wesley</publisher>
|
||||
<copyright><year>1997</year></copyright>
|
||||
<isbn>ISNB: 0-201-63392-2</isbn>
|
||||
<para>This is a very readable explanation of threads and how to use
|
||||
them. Many of the insights given apply to all multithreaded programming, not
|
||||
just POSIX Threads</para>
|
||||
</biblioentry>
|
||||
<biblioentry id="threads.bib.Hoare74">
|
||||
<abbrev id="threads.bib.Hoare74.abbrev">Hoare74</abbrev>
|
||||
<biblioset relation="journal">
|
||||
<title>Communications of the ACM</title>
|
||||
<volumenum>Vol. 17</volumenum>
|
||||
<issuenum>No. 10</issuenum>
|
||||
<date>October, 1974</date>
|
||||
</biblioset>
|
||||
<biblioset relation="article">
|
||||
<title>
|
||||
<ulink url=" http://www.acm.org/classics/feb96/"
|
||||
>Monitors: An Operating System Structuring Concept</ulink>
|
||||
</title>
|
||||
<author>
|
||||
<firstname>C.A.R.</firstname>
|
||||
<surname>Hoare</surname>
|
||||
</author>
|
||||
<pagenums>549-557</pagenums>
|
||||
</biblioset>
|
||||
<para>Hoare and Brinch Hansen's work on Monitors is the basis for reliable
|
||||
multithreading patterns. This is one of the most often referenced papers in
|
||||
all of computer science, and with good reason.</para>
|
||||
</biblioentry>
|
||||
<biblioentry id="threads.bib.ISO98">
|
||||
<abbrev id="threads.bib.ISO98.abbrev">ISO98</abbrev>
|
||||
<title>
|
||||
<ulink url="http://www.ansi.org">Programming Language C++</ulink>
|
||||
</title>
|
||||
<orgname>ISO/IEC</orgname>
|
||||
<releaseinfo>14882:1998(E)</releaseinfo>
|
||||
<para>This is the official C++ Standards document. Available from the ANSI
|
||||
(American National Standards Institute) Electronic Standards Store.</para>
|
||||
</biblioentry>
|
||||
<biblioentry id="threads.bib.McDowellHelmbold89">
|
||||
<abbrev id="threads.bib.McDowellHelmbold89.abbrev">McDowellHelmbold89</abbrev>
|
||||
<biblioset relation="journal">
|
||||
<title>Communications of the ACM</title>
|
||||
<volumenum>Vol. 21</volumenum>
|
||||
<issuenum>No. 2</issuenum>
|
||||
<date>December, 1989</date>
|
||||
</biblioset>
|
||||
<biblioset>
|
||||
<author>
|
||||
<firstname>Charles</firstname>
|
||||
<othername>E.</othername>
|
||||
<surname>McDowell</surname>
|
||||
</author>
|
||||
<author>
|
||||
<firstname>David</firstname>
|
||||
<othername>P.</othername>
|
||||
<surname>Helmbold</surname>
|
||||
</author>
|
||||
<title>
|
||||
<ulink
|
||||
url="http://www.acm.org/pubs/citations/journals/surveys/1989-21-4/p593-mcdowell/"
|
||||
>Debugging Concurrent Programs</ulink>
|
||||
</title>
|
||||
</biblioset>
|
||||
<para>Identifies many of the unique failure modes and debugging difficulties
|
||||
associated with concurrent programs.</para>
|
||||
</biblioentry>
|
||||
<biblioentry id="threads.bib.SchmidtPyarali">
|
||||
<abbrev id="threads.bib.SchmidtPyarali.abbrev">SchmidtPyarali</abbrev>
|
||||
<title>
|
||||
<ulink url="http://www.cs.wustl.edu/~schmidt/win32-cv-1.html8"
|
||||
>Strategies for Implementing POSIX Condition Variables on Win32</ulink>
|
||||
</title>
|
||||
<authorgroup>
|
||||
<author>
|
||||
<firstname>Douglas</firstname>
|
||||
<othername>C.</othername>
|
||||
<surname>Schmidt</surname>
|
||||
</author>
|
||||
<author>
|
||||
<firstname>Irfan</firstname>
|
||||
<surname>Pyarali</surname>
|
||||
</author>
|
||||
</authorgroup>
|
||||
<orgname>Department of Computer Science, Washington University, St. Louis,
|
||||
Missouri</orgname>
|
||||
<para>Rationale for understanding &Boost.Threads; condition
|
||||
variables. Note that Alexander Terekhov found some bugs in the
|
||||
implementation given in this article, so pthreads-win32 and &Boost.Threads;
|
||||
are even more complicated yet.</para>
|
||||
</biblioentry>
|
||||
<biblioentry id="threads.bib.SchmidtStalRohnertBuschmann">
|
||||
<abbrev
|
||||
id="threads.bib.SchmidtStalRohnertBuschmann.abbrev">SchmidtStalRohnertBuschmann</abbrev>
|
||||
<title>
|
||||
<ulink
|
||||
url="http://www.wiley.com/Corporate/Website/Objects/Products/0,9049,104671,00.html"
|
||||
>Pattern-Oriented Architecture Volume 2</ulink>
|
||||
</title>
|
||||
<subtitle>Patterns for Concurrent and Networked Objects</subtitle>
|
||||
<titleabbrev>POSA2</titleabbrev>
|
||||
<authorgroup>
|
||||
<author>
|
||||
<firstname>Douglas</firstname>
|
||||
<othername>C.</othername>
|
||||
<surname>Schmidt</surname>
|
||||
</author>
|
||||
<author>
|
||||
<firstname>Michael</firstname>
|
||||
<lastname>Stal</lastname>
|
||||
</author>
|
||||
<author>
|
||||
<firstname>Hans</firstname>
|
||||
<surname>Rohnert</surname>
|
||||
</author>
|
||||
<author>
|
||||
<firstname>Frank</firstname>
|
||||
<surname>Buschmann</surname>
|
||||
</author>
|
||||
</authorgroup>
|
||||
<publisher>Wiley</publisher>
|
||||
<copyright><year>2000</year></copyright>
|
||||
<para>This is a very good explanation of how to apply several patterns
|
||||
useful for concurrent programming. Among the patterns documented is the
|
||||
Monitor Pattern mentioned frequently in the &Boost.Threads;
|
||||
documentation.</para>
|
||||
</biblioentry>
|
||||
<biblioentry id="threads.bib.Stroustrup">
|
||||
<abbrev id="threads.bib.Stroustrup.abbrev">Stroustrup</abbrev>
|
||||
<title>
|
||||
<ulink url="http://cseng.aw.com/book/0,3828,0201700735,00.html"
|
||||
>The C++ Programming Language</ulink>
|
||||
</title>
|
||||
<edition>Special Edition</edition>
|
||||
<publisher>Addison-Wesley</publisher>
|
||||
<copyright><year>2000</year></copyright>
|
||||
<isbn>ISBN: 0-201-70073-5</isbn>
|
||||
<para>The first book a C++ programmer should own. Note that the 3rd edition
|
||||
(and subsequent editions like the Special Edition) has been rewritten to
|
||||
cover the ISO standard language and library.</para>
|
||||
</biblioentry>
|
||||
</bibliography>
|
||||
@@ -1,77 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>{{Library}} - Overview</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Building and Testing</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<dl class="index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#topic1">First topic</a></dt>
|
||||
<dt><a href="#topic2">Second topic</a></dt>
|
||||
<dt><a href="#footnotes">Footnotes</a></dt>
|
||||
</dl>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p>How you build the Boost.Threads libraries, and how you build your own applications
|
||||
that use those libraries, are some of the most frequently asked questions. Build
|
||||
processes are difficult to deal with in a portable manner. That's one reason
|
||||
why Boost.Threads makes use of <a href="../../../tools/build/index.html">Boost.Build</a>.
|
||||
In general you should refer to the documentation for <a href="../../../tools/build/index.html">Boost.Build</a>.
|
||||
This document will only supply you with some simple usage examples for how to
|
||||
use <em>bjam</em> to build and test Boost.Threads. In addition, this document
|
||||
will try and explain the build requirements so that users may create their own
|
||||
build processes (for instance, create an IDE specific project), both for building
|
||||
and testing Boost.Threads, as well as for building their own projects using
|
||||
Boost.Threads. </p>
|
||||
<h2><a name="topic1"></a>Building the Boost.Threads Libraries</h2>
|
||||
<p>To build the Boost.Thread libraries using Boost.Build, simply change to the
|
||||
directory <em>boost_root</em>/libs/thread/build and execute the command:</p>
|
||||
<pre>bjam -sTOOLS=<em>toolset</em></pre>
|
||||
<p>This will create four variants of the Boost.Threads library with the permuations
|
||||
of debug/release and runtime-link-dynamic/runtime-link-static. <em><strong>Note:</strong></em>
|
||||
Invoking the above command in <em>boost_root</em> will build all of the Boost
|
||||
distribution, including Boost.Threads.</p>
|
||||
<p>The Jamfile supplied with Boost.Threads produces a static library named <em>libboostthread</em>.
|
||||
In addition, on Win32 platforms a <em>boostthreadmon.dll</em> and a coresponding
|
||||
import library are created. The source files that are used to create the <em>libboostthread</em>
|
||||
library are all of the *.cpp files found in <em>boost_root</em>/libs/thread/src,
|
||||
except for <em>threadmon.cpp</em>. These need to be built with the compiler's
|
||||
and linker's multi-threading support enabled. On Win32 platforms the <em>boostthreadmon.dll</em>
|
||||
is created from <em>boost_root</em>/libs/thread/src/threadmon.cpp. This, too,
|
||||
needs to be built with the compiler's and linker's multi-threading support enabled.
|
||||
If you want to create your own build solution you'll have to follow these same
|
||||
guidelines. One of the most frequently reported problems when trying to do this
|
||||
occurs from not enabling the compiler's and linker's support for multi-threading.</p>
|
||||
<h2><a name="topic2"></a>Testing the Boost.Threads Libraries</h2>
|
||||
<p>To test the Boost.Threads libraries using Boost.Build, simply change to the
|
||||
directory <em>boost_root</em>/libs/thread/test and execute the command:</p>
|
||||
<pre><code>bjam -sTOOLS=<em>toolset</em> test</code></pre>
|
||||
<p> </p>
|
||||
<h2><a name="footnotes"></a>Footnotes</h2>
|
||||
<dl>
|
||||
<dt><a name="footnote1" class="footnote">(1)</a> {{text}}</dt>
|
||||
<dt><a name="footnote2" class="footnote">(2)</a> {{text}}</dt>
|
||||
</dl>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2001
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:{{address}}">{{author}}</a>
|
||||
2002. All Rights Reserved.</i></p>
|
||||
</body>
|
||||
</html>
|
||||
58
doc/build.xml
Normal file
58
doc/build.xml
Normal file
@@ -0,0 +1,58 @@
|
||||
<?xml version="1.0" encoding="utf-8" ?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<section id="thread.build" last-revision="$Date$">
|
||||
<title>Build</title>
|
||||
<para>
|
||||
How you build the &Boost.Threads; libraries, and how you build your own applications
|
||||
that use those libraries, are some of the most frequently asked questions. Build
|
||||
processes are difficult to deal with in a portable manner. That's one reason
|
||||
why &Boost.Threads; makes use of &Boost.Build;.
|
||||
In general you should refer to the documentation for &Boost.Build;.
|
||||
This document will only supply you with some simple usage examples for how to
|
||||
use <emphasis>bjam</emphasis> to build and test &Boost.Threads;. In addition, this document
|
||||
will try to explain the build requirements so that users may create their own
|
||||
build processes (for instance, create an IDE specific project), both for building
|
||||
and testing &Boost.Threads;, as well as for building their own projects using
|
||||
&Boost.Threads;.
|
||||
</para>
|
||||
<section id="thread.build.building">
|
||||
<title>Building the &Boost.Threads; Libraries</title>
|
||||
<para>
|
||||
To build the &Boost.Threads; libraries using &Boost.Build;, simply change to the
|
||||
directory <emphasis>boost_root</emphasis>/libs/thread/build and execute the command:
|
||||
<programlisting>bjam -sTOOLS=<emphasis>toolset</emphasis></programlisting>
|
||||
This will create the debug and the release builds of the &Boost.Threads; library.
|
||||
<note>Invoking the above command in <emphasis>boost_root</emphasis> will build all of
|
||||
the Boost distribution, including &Boost.Threads;.</note>
|
||||
</para>
|
||||
<para>
|
||||
The Jamfile supplied with &Boost.Threads; produces a dynamic link library named
|
||||
<emphasis>boost_thread{build-specific-tags}.{extension}</emphasis>, where the build-specific
|
||||
tags indicate the toolset used to build the library, whether it's a debug or release
|
||||
build, what version of Boost was used, etc.; and the extension is the appropriate extension
|
||||
for a dynamic link library for the platform for which &Boost.Threads; is being built.
|
||||
For instance, a debug library built for Win32 with VC++ 7.1 using Boost 1.31 would
|
||||
be named <emphasis>boost_thread-vc71-mt-gd-1_31.dll</emphasis>.
|
||||
</para>
|
||||
<para>
|
||||
The source files that are used to create the &Boost.Threads; library
|
||||
are all of the *.cpp files found in <emphasis>boost_root</emphasis>/libs/thread/src.
|
||||
These need to be built with the compiler's and linker's multi-threading support enabled.
|
||||
If you want to create your own build solution you'll have to follow these same
|
||||
guidelines. One of the most frequently reported problems when trying to do this
|
||||
occurs from not enabling the compiler's and linker's support for multi-threading.
|
||||
</para>
|
||||
</section>
|
||||
<section id="thread.build.testing">
|
||||
<title>Testing the &Boost.Threads; Libraries</title>
|
||||
<para>
|
||||
To test the &Boost.Threads; libraries using &Boost.Build;, simply change to the
|
||||
directory <emphasis>boost_root</emphasis>/libs/thread/test and execute the command:
|
||||
<programlisting>bjam -sTOOLS=<emphasis>toolset</emphasis> test</programlisting>
|
||||
</para>
|
||||
</section>
|
||||
</section>
|
||||
727
doc/concepts.xml
Normal file
727
doc/concepts.xml
Normal file
@@ -0,0 +1,727 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE section PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<section id="threads.concepts" last-revision="$Date$">
|
||||
<title>Concepts</title>
|
||||
|
||||
<section id="threads.concepts.mutexes">
|
||||
<title>Mutexes</title>
|
||||
|
||||
<note>Certain changes to the mutexes and lock concepts are
|
||||
currently under discussion. In particular, the combination of
|
||||
the multiple lock concepts into a single lock concept
|
||||
is likely, and the combination of the multiple mutex
|
||||
concepts into a single mutex concept is also possible.</note>
|
||||
|
||||
<para>A mutex (short for mutual-exclusion) object is used to serialize
|
||||
access to a resource shared between multiple threads. The
|
||||
<link linkend="threads.concepts.Mutex">Mutex</link> concept, with
|
||||
<link linkend="threads.concepts.TryMutex">TryMutex</link> and
|
||||
<link linkend="threads.concepts.TimedMutex">TimedMutex</link> refinements,
|
||||
formalize the requirements. A model that implements Mutex and its
|
||||
refinements has two states: <emphasis role="bold">locked</emphasis> and
|
||||
<emphasis role="bold">unlocked</emphasis>. Before using a shared resource, a
|
||||
thread locks a &Boost.Threads; mutex object
|
||||
(an object whose type is a model of
|
||||
<link linkend="threads.concepts.Mutex">Mutex</link> or one of it's
|
||||
refinements), ensuring
|
||||
<link linkend="threads.glossary.thread-safe">thread-safe</link> access to
|
||||
the shared resource. When use of the shared resource is complete, the thread
|
||||
unlocks the mutex object, allowing another thread to acquire the lock and
|
||||
use the shared resource.</para>
|
||||
<para>Traditional C thread APIs, like POSIX threads or the Windows thread
|
||||
APIs, expose functions to lock and unlock a mutex object. This is dangerous
|
||||
since it's easy to forget to unlock a locked mutex. When the flow of control
|
||||
is complex, with multiple return points, the likelihood of forgetting to
|
||||
unlock a mutex object becomes even greater. When exceptions are thrown,
|
||||
it becomes nearly impossible to ensure that the mutex object is unlocked
|
||||
properly when using these traditional API's. The result is
|
||||
<link linkend="threads.glossary.deadlock">deadlock</link>.</para>
|
||||
<para>Many C++ threading libraries use a pattern known as <emphasis>Scoped
|
||||
Locking</emphasis> &cite.SchmidtStalRohnertBuschmann; to free the programmer from
|
||||
the need to explicitly lock and unlock mutex objects. With this pattern, a
|
||||
<link linkend="threads.concepts.lock-concepts">Lock</link> concept is employed where
|
||||
the lock object's constructor locks the associated mutex object and the
|
||||
destructor automatically does the unlocking. The
|
||||
&Boost.Threads; library takes this pattern to
|
||||
the extreme in that Lock concepts are the only way to lock and unlock a
|
||||
mutex object: lock and unlock functions are not exposed by any
|
||||
&Boost.Threads; mutex objects. This helps to
|
||||
ensure safe usage patterns, especially when code throws exceptions.</para>
|
||||
|
||||
<section id="threads.concepts.locking-strategies">
|
||||
<title>Locking Strategies</title>
|
||||
|
||||
<para>Every mutex object follows one of several locking strategies. These
|
||||
strategies define the semantics for the locking operation when the calling
|
||||
thread already owns a lock on the mutex object.</para>
|
||||
|
||||
<section id="threads.concepts.recursive-locking-strategy">
|
||||
<title>Recursive Locking Strategy</title>
|
||||
|
||||
<para>With a recursive locking strategy, when a thread attempts to acquire
|
||||
a lock on the mutex object for which it already owns a lock, the operation
|
||||
is successful. Note the distinction between a thread, which may have
|
||||
multiple locks outstanding on a recursive mutex object, and a lock object,
|
||||
which even for a recursive mutex object cannot have any of its lock
|
||||
functions called multiple times without first calling unlock.</para>
|
||||
|
||||
<para>Internally a lock count is maintained and the owning thread must
|
||||
unlock the mutex object the same number of times that it locked it before
|
||||
the mutex object's state returns to unlocked. Since mutex objects in
|
||||
&Boost.Threads; expose locking
|
||||
functionality only through lock concepts, a thread will always unlock a
|
||||
mutex object the same number of times that it locked it. This helps to
|
||||
eliminate a whole set of errors typically found in traditional C style
|
||||
thread APIs.</para>
|
||||
|
||||
<para>Classes <classname>boost::recursive_mutex</classname>,
|
||||
<classname>boost::recursive_try_mutex</classname> and
|
||||
<classname>boost::recursive_timed_mutex</classname> use this locking
|
||||
strategy.</para>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.checked-locking-strategy">
|
||||
<title>Checked Locking Strategy</title>
|
||||
|
||||
<para>With a checked locking strategy, when a thread attempts to acquire a
|
||||
lock on the mutex object for which the thread already owns a lock, the
|
||||
operation will fail with some sort of error indication. Further, attempts
|
||||
by a thread to unlock a mutex object that was not locked by the thread
|
||||
will also return some sort of error indication. In
|
||||
&Boost.Threads;, an exception of type
|
||||
<classname>boost::lock_error</classname>
|
||||
would be thrown in these cases.</para>
|
||||
|
||||
<para>&Boost.Threads; does not currently
|
||||
provide any mutex objects that use this strategy.</para>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.unchecked-locking-strategy">
|
||||
<title>Unchecked Locking Strategy</title>
|
||||
|
||||
<para>With an unchecked locking strategy, when a thread attempts to acquire
|
||||
a lock on a mutex object for which the thread already owns a lock the
|
||||
operation will
|
||||
<link linkend="threads.glossary.deadlock">deadlock</link>. In general
|
||||
this locking strategy is less safe than a checked or recursive strategy,
|
||||
but it's also a faster strategy and so is employed by many libraries.</para>
|
||||
|
||||
<para>&Boost.Threads; does not currently
|
||||
provide any mutex objects that use this strategy.</para>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.unspecified-locking-strategy">
|
||||
<title>Unspecified Locking Strategy</title>
|
||||
|
||||
<para>With an unspecified locking strategy, when a thread attempts to
|
||||
acquire a lock on a mutex object for which the thread already owns a lock
|
||||
the operation results in
|
||||
<link linkend="threads.glossary.undefined-behavior">undefined behavior</link>.
|
||||
</para>
|
||||
|
||||
<para>In general a mutex object with an unspecified locking strategy is
|
||||
unsafe, and it requires programmer discipline to use the mutex object
|
||||
properly. However, this strategy allows an implementation to be as fast as
|
||||
possible with no restrictions on its implementation. This is especially
|
||||
true for portable implementations that wrap the native threading support
|
||||
of a platform. For this reason, the classes
|
||||
<classname>boost::mutex</classname>,
|
||||
<classname>boost::try_mutex</classname> and
|
||||
<classname>boost::timed_mutex</classname> use this locking strategy
|
||||
despite the lack of safety.</para>
|
||||
</section>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.sheduling-policies">
|
||||
<title>Scheduling Policies</title>
|
||||
|
||||
<para>Every mutex object follows one of several scheduling policies. These
|
||||
policies define the semantics when the mutex object is unlocked and there is
|
||||
more than one thread waiting to acquire a lock. In other words, the policy
|
||||
defines which waiting thread shall acquire the lock.</para>
|
||||
|
||||
<section id="threads.concepts.FIFO-scheduling-policy">
|
||||
<title>FIFO Scheduling Policy</title>
|
||||
|
||||
<para>With a FIFO ("First In First Out") scheduling policy, threads waiting
|
||||
for the lock will acquire it in a first-come-first-served order.
|
||||
This can help prevent a high priority thread from starving lower priority
|
||||
threads that are also waiting on the mutex object's lock.</para>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.priority-driven-scheduling-policy">
|
||||
<title>Priority Driven Policy</title>
|
||||
|
||||
<para>With a Priority Driven scheduling policy, the thread with the
|
||||
highest priority acquires the lock. Note that this means that low-priority
|
||||
threads may never acquire the lock if the mutex object has high contention
|
||||
and there is always at least one high-priority thread waiting. This is
|
||||
known as thread starvation. When multiple threads of the same priority are
|
||||
waiting on the mutex object's lock one of the other scheduling priorities
|
||||
will determine which thread shall acquire the lock.</para>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.unspecified-scheduling-policy">
|
||||
<title>Unspecified Policy</title>
|
||||
|
||||
<para>The mutex object does not specify a scheduling policy. In order to
|
||||
ensure portability, all &Boost.Threads;
|
||||
mutex objects use an unspecified scheduling policy.</para>
|
||||
</section>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.mutex-concepts">
|
||||
<title>Mutex Concepts</title>
|
||||
|
||||
<section id="threads.concepts.Mutex">
|
||||
<title>Mutex Concept</title>
|
||||
|
||||
<para>A Mutex object has two states: locked and unlocked. Mutex object
|
||||
state can only be determined by a lock object meeting the
|
||||
appropriate lock concept requirements
|
||||
and constructed for the Mutex object.</para>
|
||||
|
||||
<para>A Mutex is
|
||||
<ulink url="../../libs/utility/utility.htm#Class%20noncopyable">
|
||||
NonCopyable</ulink>.</para>
|
||||
<para>For a Mutex type <code>M</code>
|
||||
and an object <code>m</code> of that type,
|
||||
the following expressions must be well-formed
|
||||
and have the indicated effects.</para>
|
||||
|
||||
<table>
|
||||
<title>Mutex Expressions</title>
|
||||
|
||||
<tgroup cols="2">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Expression</entry>
|
||||
<entry>Effects</entry>
|
||||
</row>
|
||||
</thead>
|
||||
|
||||
<tbody>
|
||||
<row>
|
||||
<entry>M m;</entry>
|
||||
<entry><para>Constructs a mutex object m.</para>
|
||||
<para>Postcondition: m is unlocked.</para></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>(&m)->~M();</entry>
|
||||
<entry>Precondition: m is unlocked. Destroys a mutex object
|
||||
m.</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>M::scoped_lock</entry>
|
||||
<entry>A model of
|
||||
<link linkend="threads.concepts.ScopedLock">ScopedLock</link>
|
||||
</entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.TryMutex">
|
||||
<title>TryMutex Concept</title>
|
||||
|
||||
<para>A TryMutex is a refinement of
|
||||
<link linkend="threads.concepts.Mutex">Mutex</link>.
|
||||
For a TryMutex type <code>M</code>
|
||||
and an object <code>m</code> of that type,
|
||||
the following expressions must be well-formed
|
||||
and have the indicated effects.</para>
|
||||
|
||||
<table>
|
||||
<title>TryMutex Expressions</title>
|
||||
|
||||
<tgroup cols="2">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Expression</entry>
|
||||
<entry>Effects</entry>
|
||||
</row>
|
||||
</thead>
|
||||
|
||||
<tbody>
|
||||
<row>
|
||||
<entry>M::scoped_try_lock</entry>
|
||||
<entry>A model of
|
||||
<link linkend="threads.concepts.ScopedTryLock">ScopedTryLock</link>
|
||||
</entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.TimedMutex">
|
||||
<title>TimedMutex Concept</title>
|
||||
|
||||
<para>A TimedMutex is a refinement of
|
||||
<link linkend="threads.concepts.TryMutex">TryMutex</link>.
|
||||
For a TimedMutex type <code>M</code>
|
||||
and an object <code>m</code> of that type,
|
||||
the following expressions must be well-formed
|
||||
and have the indicated effects.</para>
|
||||
|
||||
<table>
|
||||
<title>TimedMutex Expressions</title>
|
||||
|
||||
<tgroup cols="2">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Expression</entry>
|
||||
<entry>Effects</entry>
|
||||
</row>
|
||||
</thead>
|
||||
|
||||
<tbody>
|
||||
<row>
|
||||
<entry>M::scoped_timed_lock</entry>
|
||||
<entry>A model of
|
||||
<link
|
||||
linkend="threads.concepts.ScopedTimedLock">ScopedTimedLock</link>
|
||||
</entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
</section>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.mutex-models">
|
||||
<title>Mutex Models</title>
|
||||
|
||||
<para>&Boost.Threads; currently supplies six models of
|
||||
<link linkend="threads.concepts.Mutex">Mutex</link>
|
||||
and its refinements.</para>
|
||||
|
||||
<table>
|
||||
<title>Mutex Models</title>
|
||||
|
||||
<tgroup cols="3">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Concept</entry>
|
||||
<entry>Refines</entry>
|
||||
<entry>Models</entry>
|
||||
</row>
|
||||
</thead>
|
||||
|
||||
<tbody>
|
||||
<row>
|
||||
<entry><link linkend="threads.concepts.Mutex">Mutex</link></entry>
|
||||
<entry></entry>
|
||||
<entry>
|
||||
<para><classname>boost::mutex</classname></para>
|
||||
<para><classname>boost::recursive_mutex</classname></para>
|
||||
</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry><link linkend="threads.concepts.TryMutex">TryMutex</link></entry>
|
||||
<entry><link linkend="threads.concepts.Mutex">Mutex</link></entry>
|
||||
<entry>
|
||||
<para><classname>boost::try_mutex</classname></para>
|
||||
<para><classname>boost::recursive_try_mutex</classname></para>
|
||||
</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry><link linkend="threads.concepts.TimedMutex">TimedMutex</link></entry>
|
||||
<entry><link linkend="threads.concepts.TryMutex">TryMutex</link></entry>
|
||||
<entry>
|
||||
<para><classname>boost::timed_mutex</classname></para>
|
||||
<para><classname>boost::recursive_timed_mutex</classname></para>
|
||||
</entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.lock-concepts">
|
||||
<title>Lock Concepts</title>
|
||||
|
||||
<para>A lock object provides a safe means for locking and unlocking a mutex
|
||||
object (an object whose type is a model of <link
|
||||
linkend="threads.concepts.Mutex">Mutex</link> or one of its refinements). In
|
||||
other words they are an implementation of the <emphasis>Scoped
|
||||
Locking</emphasis> &cite.SchmidtStalRohnertBuschmann; pattern. The <link
|
||||
linkend="threads.concepts.ScopedLock">ScopedLock</link>,
|
||||
<link linkend="threads.concepts.ScopedTryLock">ScopedTryLock</link>, and
|
||||
<link linkend="threads.concepts.ScopedTimedLock">ScopedTimedLock</link>
|
||||
concepts formalize the requirements.</para>
|
||||
<para>Lock objects are constructed with a reference to a mutex object and
|
||||
typically acquire ownership of the mutex object by setting its state to
|
||||
locked. They also ensure ownership is relinquished in the destructor. Lock
|
||||
objects also expose functions to query the lock status and to manually lock
|
||||
and unlock the mutex object.</para>
|
||||
<para>Lock objects are meant to be short lived, expected to be used at block
|
||||
scope only. The lock objects are not <link
|
||||
linkend="threads.glossary.thread-safe">thread-safe</link>. Lock objects must
|
||||
maintain state to indicate whether or not they've been locked and this state
|
||||
is not protected by any synchronization concepts. For this reason a lock
|
||||
object should never be shared between multiple threads.</para>
|
||||
|
||||
<section id="threads.concepts.Lock">
|
||||
<title>Lock Concept</title>
|
||||
|
||||
<para>For a Lock type <code>L</code>
|
||||
and an object <code>lk</code>
|
||||
and const object <code>clk</code> of that type,
|
||||
the following expressions must be well-formed
|
||||
and have the indicated effects.</para>
|
||||
|
||||
<table>
|
||||
<title>Lock Expressions</title>
|
||||
|
||||
<tgroup cols="2">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Expression</entry>
|
||||
<entry>Effects</entry>
|
||||
</row>
|
||||
</thead>
|
||||
|
||||
<tbody>
|
||||
<row>
|
||||
<entry><code>(&lk)->~L();</code></entry>
|
||||
<entry><code>if (locked()) unlock();</code></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry><code>(&clk)->operator const void*()</code></entry>
|
||||
<entry>Returns type void*, non-zero if the associated mutex
|
||||
object has been locked by <code>clk</code>, otherwise 0.</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry><code>clk.locked()</code></entry>
|
||||
<entry>Returns a <code>bool</code>, <code>(&clk)->operator
|
||||
const void*() != 0</code></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry><code>lk.lock()</code></entry>
|
||||
<entry>
|
||||
<para>Throws <classname>boost::lock_error</classname>
|
||||
if <code>locked()</code>.</para>
|
||||
|
||||
<para>If the associated mutex object is
|
||||
already locked by some other thread, places the current thread in the
|
||||
<link linkend="threads.glossary.thread-state">Blocked</link> state until
|
||||
the associated mutex is unlocked, after which the current thread
|
||||
is placed in the <link
|
||||
linkend="threads.glossary.thread-state">Ready</link> state,
|
||||
eventually to be returned to the <link
|
||||
linkend="threads.glossary.thread-state">Running</link> state. If
|
||||
the associated mutex object is already locked by the same thread
|
||||
the behavior is dependent on the <link
|
||||
linkend="threads.concepts.locking-strategies">locking
|
||||
strategy</link> of the associated mutex object.</para>
|
||||
|
||||
<para>Postcondition: <code>locked() == true</code></para>
|
||||
</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry><code>lk.unlock()</code></entry>
|
||||
<entry>
|
||||
<para>Throws <classname>boost::lock_error</classname>
|
||||
if <code>!locked()</code>.</para>
|
||||
|
||||
<para>Unlocks the associated mutex.</para>
|
||||
|
||||
<para>Postcondition: <code>!locked()</code></para></entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.ScopedLock">
|
||||
<title>ScopedLock Concept</title>
|
||||
|
||||
<para>A ScopedLock is a refinement of <link
|
||||
linkend="threads.concepts.Lock">Lock</link>.
|
||||
For a ScopedLock type <code>L</code>
|
||||
and an object <code>lk</code> of that type,
|
||||
and an object <code>m</code> of a type meeting the
|
||||
<link linkend="threads.concepts.Mutex">Mutex</link> requirements,
|
||||
and an object <code>b</code> of type <code>bool</code>,
|
||||
the following expressions must be well-formed
|
||||
and have the indicated effects.</para>
|
||||
|
||||
<table>
|
||||
<title>ScopedLock Expressions</title>
|
||||
|
||||
<tgroup cols="2">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Expression</entry>
|
||||
<entry>Effects</entry>
|
||||
</row>
|
||||
</thead>
|
||||
|
||||
<tbody>
|
||||
<row>
|
||||
<entry><code>L lk(m);</code></entry>
|
||||
<entry>Constructs an object <code>lk</code>, and associates mutex
|
||||
object <code>m</code> with it, then calls
|
||||
<code>lock()</code></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry><code>L lk(m,b);</code></entry>
|
||||
<entry>Constructs an object <code>lk</code>, and associates mutex
|
||||
object <code>m</code> with it, then if <code>b</code>, calls
|
||||
<code>lock()</code></entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.TryLock">
|
||||
<title>TryLock Concept</title>
|
||||
|
||||
<para>A TryLock is a refinement of <link
|
||||
linkend="threads.concepts.Lock">Lock</link>.
|
||||
For a TryLock type <code>L</code>
|
||||
and an object <code>lk</code> of that type,
|
||||
the following expressions must be well-formed
|
||||
and have the indicated effects.</para>
|
||||
|
||||
<table>
|
||||
<title>TryLock Expressions</title>
|
||||
|
||||
<tgroup cols="2">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Expression</entry>
|
||||
<entry>Effects</entry>
|
||||
</row>
|
||||
</thead>
|
||||
|
||||
<tbody>
|
||||
<row>
|
||||
<entry><code>lk.try_lock()</code></entry>
|
||||
<entry>
|
||||
<para>Throws <classname>boost::lock_error</classname>
|
||||
if locked().</para>
|
||||
|
||||
<para>Makes a
|
||||
non-blocking attempt to lock the associated mutex object,
|
||||
returning <code>true</code> if the lock attempt is successful,
|
||||
otherwise <code>false</code>. If the associated mutex object is
|
||||
already locked by the same thread the behavior is dependent on the
|
||||
<link linkend="threads.concepts.locking-strategies">locking
|
||||
strategy</link> of the associated mutex object.</para>
|
||||
</entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.ScopedTryLock">
|
||||
<title>ScopedTryLock Concept</title>
|
||||
|
||||
<para>A ScopedTryLock is a refinement of <link
|
||||
linkend="threads.concepts.TryLock">TryLock</link>.
|
||||
For a ScopedTryLock type <code>L</code>
|
||||
and an object <code>lk</code> of that type,
|
||||
and an object <code>m</code> of a type meeting the
|
||||
<link linkend="threads.concepts.TryMutex">TryMutex</link> requirements,
|
||||
and an object <code>b</code> of type <code>bool</code>,
|
||||
the following expressions must be well-formed
|
||||
and have the indicated effects.</para>
|
||||
|
||||
<table>
|
||||
<title>ScopedTryLock Expressions</title>
|
||||
|
||||
<tgroup cols="2">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Expression</entry>
|
||||
<entry>Effects</entry>
|
||||
</row>
|
||||
</thead>
|
||||
|
||||
<tbody>
|
||||
<row>
|
||||
<entry><code>L lk(m);</code></entry>
|
||||
<entry>Constructs an object <code>lk</code>, and associates mutex
|
||||
object <code>m</code> with it, then calls
|
||||
<code>try_lock()</code></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry><code>L lk(m,b);</code></entry>
|
||||
<entry>Constructs an object <code>lk</code>, and associates mutex
|
||||
object <code>m</code> with it, then if <code>b</code>, calls
|
||||
<code>lock()</code></entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.TimedLock">
|
||||
<title>TimedLock Concept</title>
|
||||
|
||||
<para>A TimedLock is a refinement of <link
|
||||
linkend="threads.concepts.TryLock">TryLock</link>.
|
||||
For a TimedLock type <code>L</code>
|
||||
and an object <code>lk</code> of that type,
|
||||
and an object <code>t</code> of type <classname>boost::xtime</classname>,
|
||||
the following expressions must be well-formed
|
||||
and have the indicated effects.</para>
|
||||
|
||||
<table>
|
||||
<title>TimedLock Expressions</title>
|
||||
<tgroup cols="2">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Expression</entry>
|
||||
<entry>Effects</entry>
|
||||
</row>
|
||||
</thead>
|
||||
|
||||
<tbody>
|
||||
<row>
|
||||
<entry><code>lk.timed_lock(t)</code></entry>
|
||||
<entry>
|
||||
<para>Throws <classname>boost::lock_error</classname>
|
||||
if locked().</para>
|
||||
|
||||
<para>Makes a blocking attempt
|
||||
to lock the associated mutex object, and returns <code>true</code>
|
||||
if successful within the specified time <code>t</code>, otherwise
|
||||
<code>false</code>. If the associated mutex object is already
|
||||
locked by the same thread the behavior is dependent on the <link
|
||||
linkend="threads.concepts.locking-strategies">locking
|
||||
strategy</link> of the associated mutex object.</para>
|
||||
</entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.ScopedTimedLock">
|
||||
<title>ScopedTimedLock Concept</title>
|
||||
|
||||
<para>A ScopedTimedLock is a refinement of <link
|
||||
linkend="threads.concepts.TimedLock">TimedLock</link>.
|
||||
For a ScopedTimedLock type <code>L</code>
|
||||
and an object <code>lk</code> of that type,
|
||||
and an object <code>m</code> of a type meeting the
|
||||
<link linkend="threads.concepts.TimedMutex">TimedMutex</link> requirements,
|
||||
and an object <code>b</code> of type <code>bool</code>,
|
||||
and an object <code>t</code> of type <classname>boost::xtime</classname>,
|
||||
the following expressions must be well-formed
|
||||
and have the indicated effects.</para>
|
||||
|
||||
<table>
|
||||
<title>ScopedTimedLock Expressions</title>
|
||||
<tgroup cols="2">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Expression</entry>
|
||||
<entry>Effects</entry>
|
||||
</row>
|
||||
</thead>
|
||||
|
||||
<tbody>
|
||||
<row>
|
||||
<entry><code>L lk(m,t);</code></entry>
|
||||
<entry>Constructs an object <code>lk</code>, and associates mutex
|
||||
object <code>m</code> with it, then calls
|
||||
<code>timed_lock(t)</code></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry><code>L lk(m,b);</code></entry>
|
||||
<entry>Constructs an object <code>lk</code>, and associates mutex
|
||||
object <code>m</code> with it, then if <code>b</code>, calls
|
||||
<code>lock()</code></entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
</section>
|
||||
</section>
|
||||
|
||||
<section id="threads.concepts.lock-models">
|
||||
<title>Lock Models</title>
|
||||
|
||||
<para>&Boost.Threads; currently supplies twelve models of
|
||||
<link linkend="threads.concepts.Lock">Lock</link>
|
||||
and its refinements.</para>
|
||||
|
||||
<table>
|
||||
<title>Lock Models</title>
|
||||
|
||||
<tgroup cols="3">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Concept</entry>
|
||||
<entry>Refines</entry>
|
||||
<entry>Models</entry>
|
||||
</row>
|
||||
</thead>
|
||||
|
||||
<tbody>
|
||||
<row>
|
||||
<entry><link linkend="threads.concepts.Lock">Lock</link></entry>
|
||||
<entry></entry>
|
||||
<entry></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry><link linkend="threads.concepts.ScopedLock">ScopedLock</link></entry>
|
||||
<entry><link linkend="threads.concepts.Lock">Lock</link></entry>
|
||||
<entry>
|
||||
<para><classname>boost::mutex::scoped_lock</classname></para>
|
||||
<para><classname>boost::recursive_mutex::scoped_lock</classname></para>
|
||||
|
||||
<para><classname>boost::try_mutex::scoped_lock</classname></para>
|
||||
<para><classname>boost::recursive_try_mutex::scoped_lock</classname></para>
|
||||
|
||||
<para><classname>boost::timed_mutex::scoped_lock</classname></para>
|
||||
<para><classname>boost::recursive_timed_mutex::scoped_lock</classname></para>
|
||||
</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry><link linkend="threads.concepts.TryLock">TryLock</link></entry>
|
||||
<entry><link linkend="threads.concepts.Lock">Lock</link></entry>
|
||||
<entry></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry><link linkend="threads.concepts.ScopedTryLock">ScopedTryLock</link></entry>
|
||||
<entry><link linkend="threads.concepts.TryLock">TryLock</link></entry>
|
||||
<entry>
|
||||
<para><classname>boost::try_mutex::scoped_try_lock</classname></para>
|
||||
<para><classname>boost::recursive_try_mutex::scoped_try_lock</classname></para>
|
||||
|
||||
<para><classname>boost::timed_mutex::scoped_try_lock</classname></para>
|
||||
<para><classname>boost::recursive_timed_mutex::scoped_try_lock</classname></para>
|
||||
</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry><link linkend="threads.concepts.TimedLock">TimedLock</link></entry>
|
||||
<entry><link linkend="threads.concepts.TryLock">TryLock</link></entry>
|
||||
<entry></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry><link linkend="threads.concepts.ScopedTimedLock">ScopedTimedLock</link></entry>
|
||||
<entry><link linkend="threads.concepts.TimedLock">TimedLock</link></entry>
|
||||
<entry>
|
||||
<para><classname>boost::timed_mutex::scoped_timed_lock</classname></para>
|
||||
<para><classname>boost::recursive_timed_mutex::scoped_timed_lock</classname></para>
|
||||
</entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
</section>
|
||||
</section>
|
||||
|
||||
</section>
|
||||
188
doc/condition-ref.xml
Normal file
188
doc/condition-ref.xml
Normal file
@@ -0,0 +1,188 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<header name="boost/thread/condition.hpp"
|
||||
last-revision="$Date$">
|
||||
<namespace name="boost">
|
||||
<class name="condition">
|
||||
<inherit access="private">
|
||||
<type><classname>boost::noncopyable</classname></type>
|
||||
<purpose>Exposition only</purpose>
|
||||
</inherit>
|
||||
|
||||
<purpose>
|
||||
<para>An object of class <classname>condition</classname> is a
|
||||
synchronization primitive used to cause a thread to wait until a
|
||||
particular shared-data condition (or time) is met.</para>
|
||||
</purpose>
|
||||
|
||||
<description>
|
||||
<para>A <classname>condition</classname> object is always used in
|
||||
conjunction with a <link linkend="threads.concepts.mutexes">mutex</link>
|
||||
object (an object whose type is a model of a <link
|
||||
linkend="threads.concepts.Mutex">Mutex</link> or one of its
|
||||
refinements). The mutex object must be locked prior to waiting on the
|
||||
condition, which is verified by passing a lock object (an object whose
|
||||
type is a model of <link linkend="threads.concepts.Lock">Lock</link> or
|
||||
one of its refinements) to the <classname>condition</classname> object's
|
||||
wait functions. Upon blocking on the <classname>condition</classname>
|
||||
object, the thread unlocks the mutex object. When the thread returns
|
||||
from a call to one of the <classname>condition</classname> object's wait
|
||||
functions the mutex object is again locked. The tricky unlock/lock
|
||||
sequence is performed automatically by the
|
||||
<classname>condition</classname> object's wait functions.</para>
|
||||
<para>The <classname>condition</classname> type is often used to
|
||||
implement the Monitor Object and other important patterns (see
|
||||
&cite.SchmidtStalRohnertBuschmann; and &cite.Hoare74;). Monitors are one
|
||||
of the most important patterns for creating reliable multithreaded
|
||||
programs.</para>
|
||||
<para>See <xref linkend="threads.glossary"/> for definitions of <link
|
||||
linkend="threads.glossary.thread-state">thread states</link>
|
||||
blocked and ready. Note that "waiting" is a synonym for blocked.</para>
|
||||
</description>
|
||||
|
||||
<constructor>
|
||||
<effects><simpara>Constructs a <classname>condition</classname>
|
||||
object.</simpara></effects>
|
||||
</constructor>
|
||||
|
||||
<destructor>
|
||||
<effects><simpara>Destroys <code>*this</code>.</simpara></effects>
|
||||
</destructor>
|
||||
|
||||
<method-group name="notification">
|
||||
<method name="notify_one">
|
||||
<type>void</type>
|
||||
<effects><simpara>If there is a thread waiting on <code>*this</code>,
|
||||
change that thread's state to ready. Otherwise there is no
|
||||
effect.</simpara></effects>
|
||||
<notes><simpara>If more than one thread is waiting on <code>*this</code>,
|
||||
it is unspecified which is made ready. After returning to a ready
|
||||
state the notified thread must still acquire the mutex again (which
|
||||
occurs within the call to one of the <classname>condition</classname>
|
||||
object's wait functions.)</simpara></notes>
|
||||
</method>
|
||||
|
||||
<method name="notify_all">
|
||||
<type>void</type>
|
||||
<effects><simpara>Change the state of all threads waiting on
|
||||
<code>*this</code> to ready. If there are no waiting threads,
|
||||
<code>notify_all()</code> has no effect.</simpara></effects>
|
||||
</method>
|
||||
</method-group>
|
||||
|
||||
<method-group name="waiting">
|
||||
<method name="wait">
|
||||
<template>
|
||||
<template-type-parameter name="ScopedLock"/>
|
||||
</template>
|
||||
|
||||
<type>void</type>
|
||||
|
||||
<parameter name="lock">
|
||||
<paramtype>ScopedLock&</paramtype>
|
||||
</parameter>
|
||||
|
||||
<requires><simpara><code>ScopedLock</code> meets the <link
|
||||
linkend="threads.concepts.ScopedLock">ScopedLock</link>
|
||||
requirements.</simpara></requires>
|
||||
<effects><simpara>Releases the lock on the <link
|
||||
linkend="threads.concepts.mutexes">mutex object</link>
|
||||
associated with <code>lock</code>, blocks the current thread of execution
|
||||
until readied by a call to <code>this->notify_one()</code>
|
||||
or<code> this->notify_all()</code>, and then reacquires the
|
||||
lock.</simpara></effects>
|
||||
<throws><simpara><classname>lock_error</classname> if
|
||||
<code>!lock.locked()</code></simpara></throws>
|
||||
</method>
|
||||
|
||||
<method name="wait">
|
||||
<template>
|
||||
<template-type-parameter name="ScopedLock"/>
|
||||
<template-type-parameter name="Pred"/>
|
||||
</template>
|
||||
|
||||
<type>void</type>
|
||||
|
||||
<parameter name="lock">
|
||||
<paramtype>ScopedLock&</paramtype>
|
||||
</parameter>
|
||||
|
||||
<parameter name="pred">
|
||||
<paramtype>Pred</paramtype>
|
||||
</parameter>
|
||||
|
||||
<requires><simpara><code>ScopedLock</code> meets the <link
|
||||
linkend="threads.concepts.ScopedLock">ScopedLock</link>
|
||||
requirements and the return from <code>pred()</code> is
|
||||
convertible to <code>bool</code>.</simpara></requires>
|
||||
<effects><simpara>As if: <code>while (!pred())
|
||||
wait(lock)</code></simpara></effects>
|
||||
<throws><simpara><classname>lock_error</classname> if
|
||||
<code>!lock.locked()</code></simpara></throws>
|
||||
</method>
|
||||
|
||||
<method name="timed_wait">
|
||||
<template>
|
||||
<template-type-parameter name="ScopedLock"/>
|
||||
</template>
|
||||
|
||||
<type>bool</type>
|
||||
|
||||
<parameter name="lock">
|
||||
<paramtype>ScopedLock&</paramtype>
|
||||
</parameter>
|
||||
|
||||
<parameter name="xt">
|
||||
<paramtype>const <classname>boost::xtime</classname>&</paramtype>
|
||||
</parameter>
|
||||
|
||||
<requires><simpara><code>ScopedLock</code> meets the <link
|
||||
linkend="threads.concepts.ScopedLock">ScopedLock</link>
|
||||
requirements.</simpara></requires>
|
||||
<effects><simpara>Releases the lock on the <link
|
||||
linkend="threads.concepts.mutexes">mutex object</link>
|
||||
associated with <code>lock</code>, blocks the current thread of execution
|
||||
until readied by a call to <code>this->notify_one()</code>
|
||||
or<code> this->notify_all()</code>, or until time <code>xt</code>
|
||||
is reached, and then reacquires the lock.</simpara></effects>
|
||||
<returns><simpara><code>false</code> if time <code>xt</code> is reached,
|
||||
otherwise <code>true</code>.</simpara></returns>
|
||||
<throws><simpara><classname>lock_error</classname> if
|
||||
<code>!lock.locked()</code></simpara></throws>
|
||||
</method>
|
||||
|
||||
<method name="timed_wait">
|
||||
<template>
|
||||
<template-type-parameter name="ScopedLock"/>
|
||||
<template-type-parameter name="Pred"/>
|
||||
</template>
|
||||
|
||||
<type>bool</type>
|
||||
|
||||
<parameter name="lock">
|
||||
<paramtype>ScopedLock&</paramtype>
|
||||
</parameter>
|
||||
|
||||
<parameter name="pred">
|
||||
<paramtype>Pred</paramtype>
|
||||
</parameter>
|
||||
|
||||
<requires><simpara><code>ScopedLock</code> meets the <link
|
||||
linkend="threads.concepts.ScopedLock">ScopedLock</link>
|
||||
requirements and the return from <code>pred()</code> is
|
||||
convertible to <code>bool</code>.</simpara></requires>
|
||||
<effects><simpara>As if: <code>while (!pred()) { if (!timed_wait(lock,
|
||||
xt)) return false; } return true;</code></simpara></effects>
|
||||
<returns><simpara><code>false</code> if <code>xt</code> is reached,
|
||||
otherwise <code>true</code>.</simpara></returns>
|
||||
<throws><simpara><classname>lock_error</classname> if
|
||||
<code>!lock.locked()</code></simpara></throws>
|
||||
</method>
|
||||
</method-group>
|
||||
</class>
|
||||
</namespace>
|
||||
</header>
|
||||
@@ -1,212 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - Header <boost/thread/condition.hpp></title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Header <<a href="../../../boost/thread/condition.hpp">boost/thread/condition.hpp</a>></h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<h2>Contents</h2>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#classes">Classes</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-condition">Class <code>condition</code></a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-condition-synopsis">Class <code>condition</code> synopsis</a></dt>
|
||||
<dt><a href="#class-condition-ctors">Class <code>condition</code> constructors
|
||||
and destructor</a></dt>
|
||||
<dt><a href="#class-condition-modifiers">Class <code>condition</code> modifier
|
||||
functions</a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
<dt><a href="#examples">Example(s)</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p>Include the header <<a href="../../../boost/thread/condition.hpp">boost/thread/condition.hpp</a>>
|
||||
to define the class condition.</p>
|
||||
<h2><a name="classes"></a>Classes</h2>
|
||||
<h3><a name="class-condition"></a>Class <code>condition</code></h3>
|
||||
<p>An object of class <code>condition</code> is a synchronization primitive used
|
||||
to cause a thread to wait until a particular shared-data condition (or time)
|
||||
is met. A <code>condition</code> object is always used in conjunction with a
|
||||
mutex object (an object whose type is a model of <a href="mutex_concept.html">Mutex</a>
|
||||
or one of its refinements). The mutex object must be locked prior to waiting
|
||||
on the <code>condition</code>, which is verified by passing a lock object (an
|
||||
object whose type is a model of <a href="lock_concept.html">Lock</a> or one
|
||||
of its refinements) to the <code>condition</code> object's <code>wait</code>
|
||||
functions. Upon blocking on the condition object, the thread unlocks the mutex
|
||||
object. When the thread returns from a call to one of the condition object's
|
||||
wait functions the mutex object is again locked. The tricky unlock/lock sequence
|
||||
is performed automatically by the <code> condition</code> object's <code>wait</code>
|
||||
functions.</p>
|
||||
<p>The <code>condition</code> type is often used to implement the <i> Monitor
|
||||
Object</i> and other important patterns (see <a href="bibliography.html#Schmidt-00">[Schmidt
|
||||
00]</a> and <a href="bibliography.html#Hoare-74">[Hoare 74]</a>). Monitors are
|
||||
one of the most important patterns for creating reliable multithreaded programs.</p>
|
||||
<p>See <a href="definitions.html">Formal Definitions</a> for definitions of thread
|
||||
states <a href="definitions.html#state"> blocked</a> and <a href="definitions.html#state">ready</a>.
|
||||
Note that "waiting" is a synonym for blocked.</p>
|
||||
<h4><a name="class-condition-synopsis"></a>Class <code>condition</code> synopsis</h4>
|
||||
<pre>namespace boost
|
||||
{
|
||||
class condition : private <a href="../../utility/utility.htm#Class_noncopyable">boost::noncopyable</a> // Exposition only.
|
||||
// Class condition meets the <a href="overview.html#non-copyable">NonCopyable</a> requirement.
|
||||
{
|
||||
public:
|
||||
condition();
|
||||
~condition();
|
||||
|
||||
void notify_one();
|
||||
void notify_all();
|
||||
template <typename <a href="lock_concept.html#Lock-concept">Lock</a>>
|
||||
void wait(<a href="lock_concept.html#Lock-concept">Lock</a>& lock);
|
||||
template <typename <a href="lock_concept.html#Lock-concept">Lock</a>, typename <a href="http://www.sgi.com/tech/stl/Predicate.html">Predicate</a>>
|
||||
void wait(<a href="lock_concept.html#Lock-concept">Lock</a>& lock, <a href="http://www.sgi.com/tech/stl/Predicate.html">Predicate</a> pred);
|
||||
template <typename <a href="lock_concept.html#Lock-concept">Lock</a>>
|
||||
bool timed_wait(<a href="lock_concept.html#Lock-concept">Lock</a>& lock, const xtime& xt);
|
||||
template <typename <a href="lock_concept.html#Lock-concept">Lock</a>, typename <a href="http://www.sgi.com/tech/stl/Predicate.html">Predicate</a>>
|
||||
bool timed_wait(<a href="lock_concept.html#Lock-concept">Lock</a>& lock, const xtime& XT, <a href="http://www.sgi.com/tech/stl/Predicate.html">Predicate</a> pred);
|
||||
};
|
||||
};
|
||||
</pre>
|
||||
<h4><a name="class-condition-ctors"></a>Class <code>condition</code> constructors
|
||||
and destructor</h4>
|
||||
<pre>condition();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> Constructs a <code>condition</code> object.</dt>
|
||||
</dl>
|
||||
<pre>~condition();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> Destroys <code>*this</code>.</dt>
|
||||
</dl>
|
||||
<h4><a name="class-condition-modifiers"></a>Class <code>condition</code> modifier
|
||||
functions</h4>
|
||||
<pre>void notify_one();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> If there is a thread waiting on <code>*this</code>, change
|
||||
that thread's state to ready. Otherwise there is no effect.</dt>
|
||||
<dt><b>Note:</b> If more than one thread is waiting on the condition, it is
|
||||
unspecified which is made ready. After returning to a ready state the notified
|
||||
thread must still acquire the mutex again (which occurs within the call to
|
||||
one of the <code>condition</code> object's wait functions).</dt>
|
||||
</dl>
|
||||
<pre>void notify_all();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> Change the state of all threads waiting on <code> *this</code>
|
||||
to ready. If there are no waiting threads, <code> notify_all()</code> has
|
||||
no effect.</dt>
|
||||
</dl>
|
||||
<pre>template <typename ScopedLock>
|
||||
void wait(ScopedLock& lock);
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>ScopedLock</code> meets the <a href="lock_concept.html#ScopedLock">ScopedLock</a>
|
||||
requirements.</dt>
|
||||
<dt><b>Effects:</b> Releases the lock on the <a href="mutex_concept.html">mutex
|
||||
model</a> associated with <code>lock</code>, blocks the current thread of
|
||||
execution until readied by a call to <code>this->notify_one()</code> or
|
||||
<code> this->notify_all()</code>, and then reacquires the lock.</dt>
|
||||
<dt><b>Throws:</b> <code><a href="exceptions.html#class-lock_error">lock_error</a></code>
|
||||
if <code>!lock.locked()</code></dt>
|
||||
<dt><b>Danger:</b> This version should always be used within a loop checking
|
||||
that the state logically associated with the <code>condition</code> has become
|
||||
true. Without the loop, race conditions can ensue due to possible "spurious
|
||||
wake ups". The second version encapsulates this loop idiom internally
|
||||
and is generally the preferred method.</dt>
|
||||
</dl>
|
||||
<pre>Template<typename ScopedLock, typename Pr>
|
||||
void wait(ScopedLock& lock, Pr pred);
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>ScopedLock</code> meets the <a href="lock_concept.html#ScopedLock">ScopedLock</a>
|
||||
requirements, return from <code>pred()</code> convertible to bool.</dt>
|
||||
<dt><b>Effects:</b> As if: <code>while (!pred()) wait(lock)</code></dt>
|
||||
<dt><b>Throws:</b> <code><a href="exceptions.html#class-lock_error">lock_error</a></code>
|
||||
if <code>!lock.locked()</code></dt>
|
||||
</dl>
|
||||
<pre>template <typename ScopedLock>
|
||||
bool timed_wait(ScopedLock& lock, const <a href="xtime.html">xtime</a>& XT);
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>ScopedLock</code> meets the <a href="lock_concept.html#ScopedLock">ScopedLock</a>
|
||||
requirements.</dt>
|
||||
<dt><b>Effects:</b> Releases the lock on the <a href="mutex_concept.html">mutex
|
||||
model</a> associated with the <code> lock</code>, blocks the current thread
|
||||
of execution until readied by a call to <code>this->notify_one()</code>
|
||||
or <code> this->notify_all()</code>, or until <code>XT</code>, and then
|
||||
reacquires the lock.</dt>
|
||||
<dt><b>Returns:</b> <code>false</code> if <code>XT</code> is reached, otherwise
|
||||
<code>true</code>.</dt>
|
||||
<dt><b>Throws:</b> <code><a href="exceptions.html#class-lock_error">lock_error</a></code>
|
||||
if <code>!lock.locked()</code></dt>
|
||||
<dt><b>Danger:</b> This version should always be used within a loop checking
|
||||
that the state logically associated with the <code>condition</code> has become
|
||||
true. Without the loop, race conditions can ensue due to "spurious wake
|
||||
ups". The second version encapsulates this loop idiom internally and
|
||||
is generally the preferred method.</dt>
|
||||
</dl>
|
||||
<pre>Template<typename ScopedLock, typename Pr>
|
||||
bool timed_wait(ScopedLock& lock, const <a href="xtime.html">xtime</a>& XT, Pr pred);
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>ScopedLock</code> meets the <a href="lock_concept.html#ScopedLock">ScopedLock</a>
|
||||
requirements, return from <code>pred()</code> convertible to bool.</dt>
|
||||
<dt><b>Effects:</b> As if:<br>
|
||||
<pre>while (!pred())
|
||||
{
|
||||
if (!timed_wait(lock, XT))
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
</pre>
|
||||
</dt>
|
||||
<dt><b>Returns:</b> <code>false</code> if <code>XT</code> is reached, otherwise
|
||||
<code>true</code>.</dt>
|
||||
<dt><b>Throws:</b> <code><a href="exceptions.html#class-lock_error">lock_error</a></code>
|
||||
if <code>!lock.locked()</code></dt>
|
||||
</dl>
|
||||
<h2><a name="examples"></a>Example(s)</h2>
|
||||
<p><a href="../example/condition.cpp">libs/thread/example/condition.cpp</a></p>
|
||||
<p>Typical output (dependent on scheduling policies) is:</p>
|
||||
<pre>sent: 0
|
||||
sent: 1
|
||||
received: 0
|
||||
received: 1
|
||||
sent: 2
|
||||
sent: 3
|
||||
received: 2
|
||||
received: 3
|
||||
sent: 4
|
||||
received: 4
|
||||
</pre>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->09 January, 2003<!--webbot bot="Timestamp" endspan i-checksum="38582" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
@@ -1,94 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - Configuration</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Configuration</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#lib-defined-public">Public Library Defined Macros</a></dt>
|
||||
<dt><a href="#lib-defined-impl">Library Defined Implementation Macros</a></dt>
|
||||
</dl>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p><b>Boost.Threads</b> uses several configuration macros in <a href="../../config/config.htm"><boost/config.hpp></a>,
|
||||
as well as configuration macros meant to be supplied by the application. These
|
||||
macros are documented here.</p>
|
||||
<h2><a name="lib-defined-public"></a>Public Library Defined Macros</h2>
|
||||
<p>These macros are defined by <b>Boost.Threads</b> but are expected to be used
|
||||
by application code.</p>
|
||||
<table summary="public library defined macros" cellspacing="10" width="100%">
|
||||
<tr>
|
||||
<td><b>Macro</b></td>
|
||||
<td><b>Meaning</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>BOOST_HAS_THREADS</td>
|
||||
<td>Indicates that threading support is available. This means both that there
|
||||
is a platform specific implementation for <b>Boost.Threads</b> and that
|
||||
threading support has been enabled in a platform specific manner. For instance,
|
||||
on the Win32 platform there's an implementation for <b>Boost.Threads</b>
|
||||
but unless the program is compiled against one of the multithreading runtimes
|
||||
(often determined by the compiler predefining the macro _MT) the BOOST_HAS_THREADS
|
||||
macro remains undefined.</td>
|
||||
</tr>
|
||||
</table>
|
||||
<h2><a name="lib-defined-impl"></a>Library Defined Implementation Macros</h2>
|
||||
<p>These macros are defined by <b>Boost.Threads</b> and are implementation details
|
||||
of interest only to implementors.</p>
|
||||
<table summary="library defined implementation macros" cellspacing="10" width="100%">
|
||||
<tr>
|
||||
<td><b>Macro</b></td>
|
||||
<td><b>Meaning</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>BOOST_HAS_WINTHREADS</td>
|
||||
<td>Indicates that the platform has the Microsoft Win32 threading libraries,
|
||||
and that they should be used to implement <b>Boost.Threads</b>.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>BOOST_HAS_PTHREADS</td>
|
||||
<td>Indicates that the platform has the POSIX pthreads libraries, and that
|
||||
they should be used to implement <b>Boost.Threads</b>.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>BOOST_HAS_FTIME</td>
|
||||
<td>Indicates that the implementation should use GetSystemTimeAsFileTime()
|
||||
and the FILETIME type to calculate the current time. This is an implementation
|
||||
detail used by boost::detail::getcurtime().</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>BOOST_HAS_GETTTIMEOFDAY</td>
|
||||
<td>Indicates that the implementation should use gettimeofday() to calculate
|
||||
the current time. This is an implementation detail used by boost::detail::getcurtime().</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2001
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
92
doc/configuration.xml
Normal file
92
doc/configuration.xml
Normal file
@@ -0,0 +1,92 @@
|
||||
<?xml version="1.0" encoding="utf-8" ?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<section id="thread.configuration" last-revision="$Date$">
|
||||
<title>Configuration</title>
|
||||
<para>&Boost.Threads; uses several configuration macros in <boost/config.hpp>,
|
||||
as well as configuration macros meant to be supplied by the application. These
|
||||
macros are documented here.
|
||||
</para>
|
||||
<section id="thread.configuration.public">
|
||||
<title>Library Defined Public Macros</title>
|
||||
<para>
|
||||
These macros are defined by &Boost.Threads; but are expected to be used
|
||||
by application code.
|
||||
</para>
|
||||
<informaltable>
|
||||
<tgroup cols="2">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Macro</entry>
|
||||
<entry>Meaning</entry>
|
||||
</row>
|
||||
</thead>
|
||||
<tbody>
|
||||
<row>
|
||||
<entry>BOOST_HAS_THREADS</entry>
|
||||
<entry>
|
||||
Indicates that threading support is available. This means both that there
|
||||
is a platform specific implementation for &Boost.Threads; and that
|
||||
threading support has been enabled in a platform specific manner. For instance,
|
||||
on the Win32 platform there's an implementation for &Boost.Threads;
|
||||
but unless the program is compiled against one of the multithreading runtimes
|
||||
(often determined by the compiler predefining the macro _MT) the BOOST_HAS_THREADS
|
||||
macro remains undefined.
|
||||
</entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</informaltable>
|
||||
</section>
|
||||
<section id="thread.configuration.implementation">
|
||||
<title>Library Defined Implementation Macros</title>
|
||||
<para>
|
||||
These macros are defined by &Boost.Threads; and are implementation details
|
||||
of interest only to implementors.
|
||||
</para>
|
||||
<informaltable>
|
||||
<tgroup cols="2">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Macro</entry>
|
||||
<entry>Meaning</entry>
|
||||
</row>
|
||||
</thead>
|
||||
<tbody>
|
||||
<row>
|
||||
<entry>BOOST_HAS_WINTHREADS</entry>
|
||||
<entry>
|
||||
Indicates that the platform has the Microsoft Win32 threading libraries,
|
||||
and that they should be used to implement &Boost.Threads;.
|
||||
</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>BOOST_HAS_PTHREADS</entry>
|
||||
<entry>
|
||||
Indicates that the platform has the POSIX pthreads libraries, and that
|
||||
they should be used to implement &Boost.Threads;.
|
||||
</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>BOOST_HAS_FTIME</entry>
|
||||
<entry>
|
||||
Indicates that the implementation should use GetSystemTimeAsFileTime()
|
||||
and the FILETIME type to calculate the current time. This is an implementation
|
||||
detail used by boost::detail::getcurtime().
|
||||
</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>BOOST_HAS_GETTTIMEOFDAY</entry>
|
||||
<entry>
|
||||
Indicates that the implementation should use gettimeofday() to calculate
|
||||
the current time. This is an implementation detail used by boost::detail::getcurtime().
|
||||
</entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</informaltable>
|
||||
</section>
|
||||
</section>
|
||||
@@ -1,262 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - Definitions</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Definitions</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<h2>Contents</h2>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#definitions">Definitions</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#definition-thread">Thread</a></dt>
|
||||
<dt><a href="#definition-thread-safe">Thread-safe</a></dt>
|
||||
<dt><a href="#definition-thread-state">Thread State</a></dt>
|
||||
<dt><a href="#definition-race-condition">Race Condition</a></dt>
|
||||
<dt><a href="#definition-deadlock">Deadlock</a></dt>
|
||||
<dt><a href="#definition-starvation">Starvation</a></dt>
|
||||
<dt><a href="#definition-priority-failure">Priority Failure</a></dt>
|
||||
<dt><a href="#definition-visibility">Memory Visibility</a></dt>
|
||||
</dl>
|
||||
<dt><a href="#acknowledgements">Acknowledgments</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p>The definitions are given in terms of the <a href=
|
||||
"bibliography.html#ISO-98">C++ Standard</a>. References to the standard
|
||||
are in the form [1.2.3/4], which represents the section number, with the paragraph
|
||||
number following the "/".</p>
|
||||
<p>Because the definitions are written in something akin to "standardese",
|
||||
they can be difficult to understand. The intent isn't to confuse, but rather
|
||||
to clarify the additional requirements Boost.Threads places on a C++ implementation
|
||||
as defined by the C++ Standard.</p>
|
||||
<h2><a name="definitions"></a>Definitions</h2>
|
||||
<h3><a name="definition-thread"></a>Thread</h3>
|
||||
<p>Thread is short for "thread of execution". A thread of execution
|
||||
is an execution environment [1.9/7] within the execution environment of a C++
|
||||
program [1.9]. The main() function [3.6.1] of the program is the initial function
|
||||
of the initial thread. A program in a multithreading environment always has
|
||||
an initial thread even if the program explicitly creates no additional threads.</p>
|
||||
<p>Unless otherwise specified, each thread shares all aspects of its execution
|
||||
environment with other threads in the program. Shared aspects of the execution
|
||||
environment include, but are not limited to, the following:</p>
|
||||
<ul>
|
||||
<li>Static storage duration (static, extern) objects [3.7.1].</li>
|
||||
</ul>
|
||||
<ul>
|
||||
<li>Dynamic storage duration (heap) objects [3.7.3]. Thus each memory allocation
|
||||
will return a unique addresses, regardless of the thread making the allocation
|
||||
request.</li>
|
||||
</ul>
|
||||
<ul>
|
||||
<li>Automatic storage duration (stack) objects [3.7.2] accessed via pointer
|
||||
or reference from another thread.</li>
|
||||
</ul>
|
||||
<ul>
|
||||
<li>Resources provided by the operating system. For example, files.</li>
|
||||
</ul>
|
||||
<ul>
|
||||
<li>The program itself. In other words, each thread is executing some function
|
||||
of the same program, not a totally different program.</li>
|
||||
</ul>
|
||||
<p>Each thread has its own:</p>
|
||||
<ul>
|
||||
<li>Registers and current execution sequence (program counter) [1.9/5].</li>
|
||||
</ul>
|
||||
<ul>
|
||||
<li>Automatic storage duration (stack) objects [3.7.2].</li>
|
||||
</ul>
|
||||
<h3><a name="definition-thread-safe"></a>Thread-safe</h3>
|
||||
<p>A program is thread-safe if it has no <a href="#Race condition">race conditions</a>,
|
||||
does not <a href="#Deadlock">deadlock</a>, and has no <a href="#Priority failure">priority
|
||||
failures</a>.</p>
|
||||
<p>Note that thread-safety does not necessarily imply efficiency, and than while
|
||||
some thread-safety violations can be determined statically at compile time,
|
||||
many thread-safety errors can only only be detected at runtime.</p>
|
||||
<h3><a name="definition-thread-state"></a>Thread State</h3>
|
||||
<p>During the lifetime of a thread, it shall be in one of the following states:</p>
|
||||
<table summary="thread states" border="1" cellpadding="5">
|
||||
<tr>
|
||||
<td><b>State</b></td>
|
||||
<td><b>Description</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Ready</td>
|
||||
<td>Ready to run, but waiting for a processor.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Running</td>
|
||||
<td>Currently executing on a processor. Zero or more threads may be running
|
||||
at any time, with a maximum equal to the number of processors.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Blocked</td>
|
||||
<td>Waiting for some resource other than a processor which is not currently
|
||||
available, or for the completion of calls to library functions [1.9/6].
|
||||
The term "waiting" is synonymous for "blocked"</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Terminated</td>
|
||||
<td>Finished execution but not yet detached or joined.</td>
|
||||
</tr>
|
||||
</table>
|
||||
<p>Thread state transitions shall occur only as specified:</p>
|
||||
<table summary="state transitions" border="1" cellpadding="5">
|
||||
<tr>
|
||||
<td><b>From</b></td>
|
||||
<td><b>To</b></td>
|
||||
<td><b>Cause</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>
|
||||
<p align="left">[none]</p>
|
||||
</td>
|
||||
<td>Ready</td>
|
||||
<td>Thread is created by a call to a library function. In the case of the
|
||||
initial thread, creation is implicit and occurs during the startup of the
|
||||
main() function [3.6.1].</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Ready</td>
|
||||
<td>Running</td>
|
||||
<td>Processor becomes available.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Running</td>
|
||||
<td>Ready</td>
|
||||
<td>Thread preempted.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Running</td>
|
||||
<td>Blocked</td>
|
||||
<td>Thread calls a library function which waits for a resource or for the
|
||||
completion of I/O.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Running</td>
|
||||
<td>Terminated</td>
|
||||
<td>Thread returns from its initial function, calls a thread termination library
|
||||
function, or is canceled by some other thread calling a thread termination
|
||||
library function.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Blocked</td>
|
||||
<td>Ready</td>
|
||||
<td>The resource being waited for becomes available, or the blocking library
|
||||
function completes.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>Terminated</td>
|
||||
<td>[none]</td>
|
||||
<td>Thread is detached or joined by some other thread calling the appropriate
|
||||
library function, or by program termination [3.6.3].</td>
|
||||
</tr>
|
||||
</table>
|
||||
<p>[Note: if a suspend() function is added to the threading library, additional
|
||||
transitions to the blocked state will have to be added to the above table.]</p>
|
||||
<h3><a name="definition-race-condition"></a>Race Condition</h3>
|
||||
<p>A race condition is what occurs when multiple threads read and write to the
|
||||
same memory without proper synchronization, resulting in an incorrect value
|
||||
being read or written. The result of a race condition may be a bit pattern which
|
||||
isn't even a valid value for the data type. A race condition results in
|
||||
undefined behavior [1.3.12].</p>
|
||||
<p>Race conditions can be prevented by serializing memory access using the tools
|
||||
provided by Boost.Threads.</p>
|
||||
<h3><a name="definition-deadlock"></a>Deadlock</h3>
|
||||
<p>Deadlock is an execution state where for some set of threads, each thread in
|
||||
the set is blocked waiting for some action by one of the other threads in the
|
||||
set. Since each is waiting on the others, none will ever become ready again.</p>
|
||||
<h3><a name="definition-starvation"></a>Starvation</h3>
|
||||
<p>The condition in which a thread is not making sufficient progress in its work
|
||||
during a given time interval.</p>
|
||||
<h3><a name="definition-priority-failure"></a>Priority Failure</h3>
|
||||
<p>A priority failure (such as priority inversion or infinite overtaking) occurs
|
||||
when threads executed in such a sequence that required work is not performed
|
||||
in time to be useful.</p>
|
||||
<h3><a name="definition-visibility"></a>Memory Visibility</h3>
|
||||
<p>An address [1.7] shall always point to the same memory byte, regardless of
|
||||
the thread or processor dereferencing the address.</p>
|
||||
<p>An object [1.8, 1.9] is accessible from multiple threads if it is of static
|
||||
storage duration (static, extern) [3.7.1], or if a pointer or reference to it
|
||||
is explicitly or implicitly dereferenced in multiple threads.</p>
|
||||
<p>For an object accessible from multiple threads, the value of the object accessed
|
||||
from one thread may be indeterminate or different than the value accessed from
|
||||
another thread, except under the conditions specified in the following table.
|
||||
For the same row of the table, the value of an object accessible at the indicated
|
||||
sequence point in thread A will be determinate and the same if accessed at or
|
||||
after the indicated sequence point in thread B, provided the object is not otherwise
|
||||
modified. In the table, the "sequence point at a call" is the sequence
|
||||
point after the evaluation of all function arguments [1.9/17], while the "sequence
|
||||
point after a call" is the sequence point after the copying of the returned
|
||||
value..." [1.9/17].</p>
|
||||
<table summary="memory visibility" border="1" cellpadding="5">
|
||||
<tr>
|
||||
<td align="center"><b>Thread A</b></td>
|
||||
<td align="center"><b>Thread B</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>The sequence point at a call to a library thread-creation function.</td>
|
||||
<td>The first sequence point of the initial function in the new thread created
|
||||
by the Thread A call.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>The sequence point at a call to a library function which locks a mutex,
|
||||
directly or by waiting for a condition variable.</td>
|
||||
<td>The sequence point after a call to a library function which unlocks the
|
||||
same mutex.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>The last sequence point before thread termination.</td>
|
||||
<td>The sequence point after a call to a library function which joins the
|
||||
terminated thread.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>The sequence point at a call to a library function which signals or broadcasts
|
||||
a condition variable.</td>
|
||||
<td>The sequence point after the call to the library function which was waiting
|
||||
on that same condition variable or signal.</td>
|
||||
</tr>
|
||||
</table>
|
||||
<p>The architecture of the execution environment and the observable behavior of
|
||||
the abstract machine [1.9] shall be the same on all processors.</p>
|
||||
<p>The latitude granted by the C++ standard for an implementation to alter the
|
||||
definition of observable behavior of the abstract machine to include additional
|
||||
library I/O functions [1.9/6] is extended to include threading library functions.</p>
|
||||
<p>When an exception is thrown and there is no matching exception handler in the
|
||||
same thread, behavior is undefined. The preferred behavior is the same as when
|
||||
there is no matching exception handler in a program [15.3/9]. That is, terminate()
|
||||
is called, and it is implementation defined whether or not the stack is unwound.</p>
|
||||
<h2><a name="acknowledgements"></a>Acknowledgments</h2>
|
||||
<p>This document was originally written by Beman Dawes, and then much improved by the incorporation of comments from
|
||||
William Kempf, who now maintains the contents.</p>
|
||||
<p>The visibility rules are based on <a href=
|
||||
"bibliography.html#Butenhof-97">[Butenhof 97]</a>.</p>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->06 October, 2002<!--webbot bot="Timestamp" endspan i-checksum="38429" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.<br>
|
||||
</i>© Copyright Beman Dawes, 2001</p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
155
doc/design.xml
Normal file
155
doc/design.xml
Normal file
@@ -0,0 +1,155 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<section id="threads.design" last-revision="$Date$">
|
||||
<title>Design</title>
|
||||
<para>With client/server and three-tier architectures becoming common place
|
||||
in today's world, it's becoming increasingly important for programs to be
|
||||
able to handle parallel processing. Modern day operating systems usually
|
||||
provide some support for this through native thread APIs. Unfortunately,
|
||||
writing portable code that makes use of parallel processing in C++ is made
|
||||
very difficult by a lack of a standard interface for these native APIs.
|
||||
Further, these APIs are almost universally C APIs and fail to take
|
||||
advantage of C++'s strengths, or to address concepts unique to C++, such as
|
||||
exceptions.</para>
|
||||
<para>The &Boost.Threads; library is an attempt to define a portable interface
|
||||
for writing parallel processes in C++.</para>
|
||||
<section id="threads.design.goals">
|
||||
<title>Goals</title>
|
||||
<para>The &Boost.Threads; library has several goals that should help to set
|
||||
it apart from other solutions. These goals are listed in order of precedence
|
||||
with full descriptions below.
|
||||
<variablelist>
|
||||
<varlistentry>
|
||||
<term>Portability</term>
|
||||
<listitem>
|
||||
<para>&Boost.Threads; was designed to be highly portable. The goal is
|
||||
for the interface to be easily implemented on any platform that
|
||||
supports threads, and possibly even on platforms without native thread
|
||||
support.</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
<varlistentry>
|
||||
<term>Safety</term>
|
||||
<listitem>
|
||||
<para>&Boost.Threads; was designed to be as safe as possible. Writing
|
||||
<link linkend="threads.glossary.thread-safe">thread-safe</link>
|
||||
code is very difficult and successful libraries must strive to
|
||||
insulate the programmer from dangerous constructs as much as
|
||||
possible. This is accomplished in several ways:
|
||||
<itemizedlist>
|
||||
<listitem>
|
||||
<para>C++ language features are used to make correct usage easy
|
||||
(if possible) and error-prone usage impossible or at least more
|
||||
difficult. For example, see the <link
|
||||
linkend="threads.concepts.Mutex">Mutex</link> and <link
|
||||
linkend="threads.concepts.Lock">Lock</link> designs, and note
|
||||
how they interact.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Certain traditional concurrent programming features are
|
||||
considered so error-prone that they are not provided at all. For
|
||||
example, see <xref linkend="threads.rationale.events" />.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Dangerous features, or features which may be misused, are
|
||||
identified as such in the documentation to make users aware of
|
||||
potential pitfalls.</para>
|
||||
</listitem>
|
||||
</itemizedlist></para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
<varlistentry>
|
||||
<term>Flexibility</term>
|
||||
<listitem>
|
||||
<para>&Boost.Threads; was designed to be flexible. This goal is often
|
||||
at odds with <emphasis>safety</emphasis>. When functionality might be
|
||||
compromised by the desire to keep the interface safe, &Boost.Threads;
|
||||
has been designed to provide the functionality, but to make it's use
|
||||
prohibitive for general use. In other words, the interfaces have been
|
||||
designed such that it's usually obvious when something is unsafe, and
|
||||
the documentation is written to explain why.</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
<varlistentry>
|
||||
<term>Efficiency</term>
|
||||
<listitem>
|
||||
<para>&Boost.Threads; was designed to be as efficient as
|
||||
possible. When building a library on top of another library there is
|
||||
always a danger that the result will be so much slower than the
|
||||
"native" API that programmers are inclined to ignore the higher level
|
||||
API. &Boost.Threads; was designed to minimize the chances of this
|
||||
occurring. The interfaces have been crafted to allow an implementation
|
||||
the greatest chance of being as efficient as possible. This goal is
|
||||
often at odds with the goal for <emphasis>safety</emphasis>. Every
|
||||
effort was made to ensure efficient implementations, but when in
|
||||
conflict <emphasis>safety</emphasis> has always taken
|
||||
precedence.</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
</variablelist></para>
|
||||
</section>
|
||||
<section>
|
||||
<title>Iterative Phases</title>
|
||||
<para>Another goal of &Boost.Threads; was to take a dynamic, iterative
|
||||
approach in its development. The computing industry is still exploring the
|
||||
concepts of parallel programming. Most thread libraries supply only simple
|
||||
primitive concepts for thread synchronization. These concepts are very
|
||||
simple, but it is very difficult to use them safely or to provide formal
|
||||
proofs for constructs built on top of them. There has been a lot of research
|
||||
into other concepts, such as in "Communicating Sequential Processes."
|
||||
&Boost.Threads; was designed in iterative steps, with each step providing
|
||||
the building blocks necessary for the next step and giving the researcher
|
||||
the tools necessary to explore new concepts in a portable manner.</para>
|
||||
<para>Given the goal of following a dynamic, iterative approach
|
||||
&Boost.Threads; shall go through several growth cycles. Each phase in its
|
||||
development shall be roughly documented here.</para>
|
||||
</section>
|
||||
<section>
|
||||
<title>Phase 1, Synchronization Primitives</title>
|
||||
<para>Boost is all about providing high quality libraries with
|
||||
implementations for many platforms. Unfortunately, there's a big problem
|
||||
faced by developers wishing to supply such high quality libraries, namely
|
||||
thread-safety. The C++ standard doesn't address threads at all, but real
|
||||
world programs often make use of native threading support. A portable
|
||||
library that doesn't address the issue of thread-safety is therefore not
|
||||
much help to a programmer who wants to use the library in his multithreaded
|
||||
application. So there's a very great need for portable primitives that will
|
||||
allow the library developer to create <link
|
||||
linkend="threads.glossary.thread-safe">thread-safe</link>
|
||||
implementations. This need far out weighs the need for portable methods to
|
||||
create and manage threads.</para>
|
||||
<para>Because of this need, the first phase of &Boost.Threads; focuses
|
||||
solely on providing portable primitive concepts for thread
|
||||
synchronization. Types provided in this phase include the
|
||||
<classname>boost::mutex</classname>,
|
||||
<classname>boost::try_mutex</classname>,
|
||||
<classname>boost::timed_mutex</classname>,
|
||||
<classname>boost::recursive_mutex</classname>,
|
||||
<classname>boost::recursive_try_mutex</classname>,
|
||||
<classname>boost::recursive_timed_mutex</classname>, and
|
||||
<classname>boost::lock_error</classname>. These are considered the "core"
|
||||
synchronization primitives, though there are others that will be added in
|
||||
later phases.</para>
|
||||
</section>
|
||||
<section id="threads.design.phase2">
|
||||
<title>Phase 2, Thread Management and Thread Specific Storage</title>
|
||||
<para>This phase addresses the creation and management of threads and
|
||||
provides a mechanism for thread specific storage (data associated with a
|
||||
thread instance). Thread management is a tricky issue in C++, so this
|
||||
phase addresses only the basic needs of multithreaded program. Later
|
||||
phases are likely to add additional functionality in this area. This
|
||||
phase of &Boost.Threads; adds the <classname>boost::thread</classname> and
|
||||
<classname>boost::thread_specific_ptr</classname> types. With these
|
||||
additions the &Boost.Threads; library can be considered minimal but
|
||||
complete.</para>
|
||||
</section>
|
||||
<section>
|
||||
<title>The Next Phase</title>
|
||||
<para>The next phase will address more advanced synchronization concepts,
|
||||
such as read/write mutexes and barriers.</para>
|
||||
</section>
|
||||
</section>
|
||||
26
doc/entities.xml
Normal file
26
doc/entities.xml
Normal file
@@ -0,0 +1,26 @@
|
||||
<!ENTITY Boost.Threads "<emphasis role='bold'>Boost.Threads</emphasis>">
|
||||
<!ENTITY Boost.Build "<emphasis role='bold'>Boost.Build</emphasis>">
|
||||
<!ENTITY cite.AndrewsSchneider83 "<citation><xref
|
||||
linkend='threads.bib.AndrewsSchneider83'
|
||||
endterm='threads.bib.AndrewsSchneider83.abbrev'/></citation>">
|
||||
<!ENTITY cite.Boost "<citation><xref linkend='threads.bib.Boost'
|
||||
endterm='threads.bib.Boost.abbrev'/></citation>">
|
||||
<!ENTITY cite.Hansen73 "<citation><xref linkend='threads.bib.Hansen73'
|
||||
endterm='threads.bib.Hansen73.abbrev'/></citation>">
|
||||
<!ENTITY cite.Butenhof97 "<citation><xref linkend='threads.bib.Butenhof97'
|
||||
endterm='threads.bib.Butenhof97.abbrev'/></citation>">
|
||||
<!ENTITY cite.Hoare74 "<citation><xref linkend='threads.bib.Hoare74'
|
||||
endterm='threads.bib.Hoare74.abbrev'/></citation>">
|
||||
<!ENTITY cite.ISO98 "<citation><xref linkend='threads.bib.ISO98'
|
||||
endterm='threads.bib.ISO98.abbrev'/></citation>">
|
||||
<!ENTITY cite.McDowellHelmbold89 "<citation><xref
|
||||
linkend='threads.bib.McDowellHelmbold89'
|
||||
endterm='threads.bib.McDowellHelmbold89.abbrev'/></citation>">
|
||||
<!ENTITY cite.SchmidtPyarali "<citation><xref
|
||||
linkend='threads.bib.SchmidtPyarali'
|
||||
endterm='threads.bib.SchmidtPyarali.abbrev'/></citation>">
|
||||
<!ENTITY cite.SchmidtStalRohnertBuschmann "<citation><xref
|
||||
linkend='threads.bib.SchmidtStalRohnertBuschmann'
|
||||
endterm='threads.bib.SchmidtStalRohnertBuschmann.abbrev'/></citation>">
|
||||
<!ENTITY cite.Stroustrup "<citation><xref linkend='threads.bib.Stroustrup'
|
||||
endterm='threads.bib.Stroustrup.abbrev'/></citation>">
|
||||
58
doc/exceptions-ref.xml
Normal file
58
doc/exceptions-ref.xml
Normal file
@@ -0,0 +1,58 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<header name="boost/thread/exceptions.hpp"
|
||||
last-revision="$Date$">
|
||||
<namespace name="boost">
|
||||
<class name="lock_error">
|
||||
<purpose>
|
||||
<simpara>The lock_error class defines an exception type thrown
|
||||
to indicate a locking related error has been detected.</simpara>
|
||||
</purpose>
|
||||
|
||||
<description>
|
||||
<simpara>Examples of errors indicated by a lock_error exception
|
||||
include a lock operation which can be determined to result in a
|
||||
deadlock, or unlock operations attempted by a thread that does
|
||||
not own the lock.</simpara>
|
||||
</description>
|
||||
|
||||
<inherit access="public">
|
||||
<type><classname>std::logical_error</classname></type>
|
||||
</inherit>
|
||||
|
||||
<constructor>
|
||||
<effects><simpara>Constructs a <code>lock_error</code> object.
|
||||
</simpara></effects>
|
||||
</constructor>
|
||||
</class>
|
||||
|
||||
<class name="thread_resource_error">
|
||||
<purpose>
|
||||
<simpara>The <classname>thread_resource_error</classname> class
|
||||
defines an exception type that is thrown by constructors in the
|
||||
&Boost.Threads; library when thread-related resources can not be
|
||||
acquired.</simpara>
|
||||
</purpose>
|
||||
|
||||
<description>
|
||||
<simpara><classname>thread_resource_error</classname> is used
|
||||
only when thread-related resources cannot be acquired; memory
|
||||
allocation failures are indicated by
|
||||
<classname>std::bad_alloc</classname>.</simpara>
|
||||
</description>
|
||||
|
||||
<inherit access="public">
|
||||
<type><classname>std::runtime_error</classname></type>
|
||||
</inherit>
|
||||
|
||||
<constructor>
|
||||
<effects><simpara>Constructs a <code>thread_resource_error</code>
|
||||
object.</simpara></effects>
|
||||
</constructor>
|
||||
</class>
|
||||
</namespace>
|
||||
</header>
|
||||
@@ -1,110 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - Header <boost/thread/exceptions.hpp></title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Header <<a href="../../../boost/thread/exceptions.hpp">boost/thread/exceptions.hpp</a>></h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<h2>Contents</h2>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#classes">Classes</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-lock_error">Class <code>lock_error</code></a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-lock_error-synopsis">Class <code>lock_error</code> synopsis</a></dt>
|
||||
<dt><a href="#class-lock_error-ctors">Class <code>lock_error</code> constructors
|
||||
and destructor</a></dt>
|
||||
</dl>
|
||||
<dt><a href="#class-thread_resource_error">Class <code>thread_resource_error</code></a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-thread_resource_error-synopsis">Class <code>thread_resource_error</code>
|
||||
synopsis</a></dt>
|
||||
<dt><a href="#class-thread_resource_error-ctors">Class <code>thread_resource_error</code>
|
||||
constructors and destructor</a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
</dl>
|
||||
<hr>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p>Include the header <<a href="../../../boost/thread/exceptions.hpp">boost/thread/exceptions.hpp</a>>
|
||||
to define the exception types that may be thrown by <b>Boost.Threads</b> classes.</p>
|
||||
<h2><a name="classes"></a>Classes</h2>
|
||||
<h3><a name="class-lock_error"></a>Class <code>lock_error</code></h3>
|
||||
<p>The lock_error class defines an exception type thrown to indicate a locking
|
||||
related error has been detected. Examples of such errors include a lock operation
|
||||
which can be determined to result in a deadlock, or unlock operations attempted
|
||||
by a thread that does not own the lock. </p>
|
||||
<h4><a name="class-lock_error-synopsis"></a>Class <code>lock_error</code> synopsis</h4>
|
||||
<pre>
|
||||
namespace boost
|
||||
{
|
||||
class lock_error : public std::logical_error
|
||||
{
|
||||
public:
|
||||
lock_error();
|
||||
};
|
||||
};
|
||||
</pre>
|
||||
<h4><a name="class-lock_error-ctors"></a>Class <code>lock_error</code> constructors
|
||||
and destructor</h4>
|
||||
<pre>
|
||||
lock_error();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> Constructs a <code>lock_error</code> object.</dt>
|
||||
</dl>
|
||||
<h3><a name="class-thread_resource_error"></a>Class <code>thread_resource_error</code></h3>
|
||||
<p>The thread_resource_error class defines an exception type that is thrown by
|
||||
constructors in the Boost.Threads library when thread related resources can
|
||||
not be acquired. This does not include memory allocation failures which instead
|
||||
throw std::bad_alloc. </p>
|
||||
<h4><a name="class-thread_resource_error-synopsis"></a>Class <code>thread_resource_error</code>
|
||||
synopsis</h4>
|
||||
<pre>
|
||||
namespace boost
|
||||
{
|
||||
class thread_resource_error : public std::runtime_error
|
||||
{
|
||||
public:
|
||||
thread_resource_error();
|
||||
};
|
||||
};
|
||||
</pre>
|
||||
<h4><a name="class-thread_resource_error-ctors"></a>Class <code>thread_resource_error</code>
|
||||
constructors and destructor</h4>
|
||||
<pre>
|
||||
thread_resource_error();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> Constructs a <code>thread_resource_error</code> object.</dt>
|
||||
</dl>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2001
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
180
doc/faq.html
180
doc/faq.html
@@ -1,180 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - FAQ</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Frequently Asked Questions (FAQs)</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#question1">1. Are lock objects thread safe?</a></dt>
|
||||
<dt><a href="#question2a">2a. Why was <b>Boost.Threads</b> modeled after (specific
|
||||
library name)?</a></dt>
|
||||
<dt><a href="#question2b">2b. Why wasn't <b>Boost.Threads</b> modeled after
|
||||
(specific library name)?</a></dt>
|
||||
<dt><a href="#question3">3. Why do mutexes have noncopyable semantics?</a></dt>
|
||||
<dt><a href="#question4">4. How can you prevent deadlock from occurring when
|
||||
a thread must lock multiple mutexes?</a></dt>
|
||||
<dt><a href="#question5">5. Don't noncopyable mutex semantics mean that a class
|
||||
with a mutex member will be noncopyable as well?</a></dt>
|
||||
<dt><a href="#question6">6. How can you lock a mutex member in a const member
|
||||
function (in order to implement the monitor pattern)?</a></dt>
|
||||
<dt><a href="#question7">7. Why supply condition variables rather than event
|
||||
variables?</a></dt>
|
||||
<dt><a href="#question8">8. Why isn't thread cancellation or termination provided?</a></dt>
|
||||
<dt><a href="#question9">9. Is it safe for threads to share automatic storage
|
||||
duration (stack) objects via pointers or references?</a></dt>
|
||||
<dt><a href="#question10">10. Why has class semaphore disappeared?</a></dt>
|
||||
</dl>
|
||||
<h2><a name="question1"></a>1. Are lock objects <a href="definitions.html#definition-thread-safe">
|
||||
thread safe</a>?</h2>
|
||||
<p><b>No!</b> Lock objects are not meant to be shared between threads. They are
|
||||
meant to be short-lived objects created on automatic storage within a code block.
|
||||
Any other usage is just likely to lead to errors and won't really be of
|
||||
actual benefit any way. Share <a href=
|
||||
"mutex_concept.html">mutexes</a>, not locks. For more information see
|
||||
the <a href="rationale.html#lock_objects">rationale</a> behind the design for
|
||||
lock objects.</p>
|
||||
<h2><a name="question2a"></a>2a. Why was <b>Boost.Threads</b> modeled after (specific
|
||||
library name)?</h2>
|
||||
<p>It wasn't. Boost.Threads was designed from scratch. Extensive design discussions
|
||||
involved numerous people representing a wide range of experience across many
|
||||
platforms. To ensure portability, the initial implements were done in parallel
|
||||
using POSIX Threads and the Win32 threading API. But the Boost.Threads design
|
||||
is very much in the spirit of C++, and thus doesn't model such C based APIs.</p>
|
||||
<h2><a name="question2b"></a>2b. Why wasn't Boost.Threads modeled after (specific
|
||||
library name)?</h2>
|
||||
<p>Existing C++ libraries either seemed dangerous (often failing to take advantage
|
||||
of prior art to reduce errors) or had excessive dependencies on library components
|
||||
unrelated to threading. Existing C libraries couldn't meet our C++ requirements,
|
||||
and were also missing certain features. For instance, the WIN32 thread API lacks
|
||||
condition variables, even though these are critical for the important Monitor
|
||||
pattern <a href="bibliography.html#Schmidt-00">[Schmidt 00]</a>.</p>
|
||||
<h2><a name="question3"></a>3. Why do <a href="mutex_concept.html">Mutexes</a>
|
||||
have noncopyable semantics?</h2>
|
||||
<p>To ensure that <a href="definitions.html#Deadlock">deadlocks</a> don't
|
||||
occur. The only logical form of copy would be to use some sort of shallow copy
|
||||
semantics in which multiple mutex objects could refer to the same mutex state.
|
||||
This means that if ObjA has a mutex object as part of its state and ObjB is
|
||||
copy constructed from it, then when ObjB::foo() locks the mutex it has effectively
|
||||
locked ObjA as well. This behavior can result in deadlock. Other copy semantics
|
||||
result in similar problems (if you think you can prove this to be wrong then
|
||||
supply us with an alternative and we'll reconsider).</p>
|
||||
<h2><a name="question4"></a>4. How can you prevent <a href="definitions.html#Deadlock">
|
||||
deadlock</a> from occurring when a thread must lock multiple mutexes?</h2>
|
||||
<p>Always lock them in the same order. One easy way of doing this is to use each
|
||||
mutex's address to determine the order in which they are locked. A future
|
||||
Boost.Threads concept may wrap this pattern up in a reusable class.</p>
|
||||
<h2><a name="question5"></a>5. Don't noncopyable <a href="mutex_concept.html">mutex</a>
|
||||
semantics mean that a class with a mutex member will be noncopyable as well?</h2>
|
||||
<p>No, but what it does mean is that the compiler can't generate a copy constructor
|
||||
and assignment operator, so they will have to be coded explicitly. This is a
|
||||
<b>good thing</b>, however, since the compiler generated operations would not
|
||||
be <a href=
|
||||
"definitions.html#Thread-safe">thread-safe</a>. The following is a simple
|
||||
example of a class with copyable semantics and internal synchronization through
|
||||
a mutex member.</p>
|
||||
<pre>class counter
|
||||
{
|
||||
public:
|
||||
// Doesn't need synchronization since there can be no references to *this
|
||||
// until after it's constructed!
|
||||
explicit counter(int initial_value)
|
||||
: m_value(initial_value)
|
||||
{
|
||||
}
|
||||
|
||||
// We only need to synchronize other for the same reason we don't have to
|
||||
// synchronize on construction!
|
||||
counter(const counter& other)
|
||||
{
|
||||
boost::mutex::scoped_lock scoped_lock(other.m_mutex);
|
||||
m_value = other.m_value;
|
||||
}
|
||||
|
||||
// For assignment we need to synchronize both objects!
|
||||
const counter& operator=(const counter& other)
|
||||
{
|
||||
if (this == &other)
|
||||
return *this;
|
||||
|
||||
boost::mutex::scoped_lock lock1(&m_mutex < &other.m_mutex ? m_mutex : other.m_mutex);
|
||||
boost::mutex::scoped_lock lock2(&m_mutex > &other.m_mutex ? m_mutex : other.m_mutex);
|
||||
m_value = other.m_value;
|
||||
|
||||
return *this;
|
||||
}
|
||||
|
||||
int value() const
|
||||
{
|
||||
boost::mutex::scoped_lock scoped_lock(m_mutex);
|
||||
return m_value;
|
||||
}
|
||||
int increment()
|
||||
{
|
||||
boost::mutex::scoped_lock scoped_lock(m_mutex);
|
||||
return ++m_value;
|
||||
}
|
||||
|
||||
private:
|
||||
mutable boost::mutex m_mutex;
|
||||
int m_value;
|
||||
};
|
||||
</pre>
|
||||
<h2><a name="question6"></a>6. How can you lock a <a href="mutex_concept.html">mutex</a>
|
||||
member in a const member function, in order to implement the Monitor Pattern?</h2>
|
||||
<p>The Monitor Pattern mutex <a href="bibliography.html#Schmidt-00"> [Schmidt
|
||||
00]</a> should simply be declared as mutable. See the example code above. The
|
||||
internal state of mutex types could have been made mutable, with all lock calls
|
||||
made via const functions, but this does a poor job of documenting the actual
|
||||
semantics (and in fact would be incorrect since the logical state of a locked
|
||||
mutex clearly differs from the logical state of an unlocked mutex). Declaring
|
||||
a mutex member as mutable clearly documents the intended semantics.</p>
|
||||
<h2><a name="question7"></a>7. Why supply <a href="condition.html">condition variables</a>
|
||||
rather than <a href="rationale.html#Events">event variables</a>?</h2>
|
||||
<p>Condition variables result in user code much less prone to
|
||||
<a href="definitions.html#definition-race-condition">race conditions</a> than event variables.
|
||||
See <a href="rationale.html#Events">Rationale</a> for analysis. Also see <a href="bibliography.html#Hoare-74">[Hoare
|
||||
74]</a> and <a href="bibliography.html#Schmidt-00">[Schmidt 00]</a>.</p>
|
||||
<h2><a name="question8"></a>8. Why isn't thread cancellation or termination
|
||||
provided?</h2>
|
||||
<p>There's a valid need for thread termination, so at some point Boost.Threads
|
||||
probably will include it, but only after we can find a truly safe (and portable)
|
||||
mechanism for this concept.</p>
|
||||
<h2><a name="question9"></a>9. Is it safe for threads to share automatic storage
|
||||
duration (stack) objects via pointers or references?</h2>
|
||||
<p>Only if you can guarantee that the lifetime of the stack object will not end
|
||||
while other threads might still access the object. Thus the safest practice
|
||||
is to avoid sharing stack objects, particularly in designs where threads are
|
||||
created and destroyed dynamically. Restrict sharing of stack objects to simple
|
||||
designs with very clear and unchanging function and thread lifetimes. (Suggested
|
||||
by Darryl Green).</p>
|
||||
<h2><a name="question10"></a>10. Why has class semaphore disappeared?</h2>
|
||||
<p>Semaphore was removed as too error prone. The same effect can be achieved with
|
||||
greater safety by the combination of a mutex and a condition variable.</p>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->09 January, 2003<!--webbot bot="Timestamp" endspan i-checksum="38582" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
210
doc/faq.xml
Normal file
210
doc/faq.xml
Normal file
@@ -0,0 +1,210 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<section id="threads.faq" last-revision="$Date$">
|
||||
<title>Frequently Asked Questions</title>
|
||||
<qandaset>
|
||||
<qandaentry>
|
||||
<question>
|
||||
<para>Are lock objects <link
|
||||
linkend="threads.glossary.thread-safe">thread safe</link>?</para>
|
||||
</question>
|
||||
<answer>
|
||||
<para><emphasis role="bold">No!</emphasis> Lock objects are not meant to
|
||||
be shared between threads. They are meant to be short-lived objects
|
||||
created on automatic storage within a code block. Any other usage is
|
||||
just likely to lead to errors and won't really be of actual benefit anyway.
|
||||
Share <link linkend="threads.concepts.mutexes">Mutexes</link>, not
|
||||
Locks. For more information see the <link
|
||||
linkend="threads.rationale.locks">rationale</link> behind the
|
||||
design for lock objects.</para>
|
||||
</answer>
|
||||
</qandaentry>
|
||||
<qandaentry>
|
||||
<question>
|
||||
<para>Why was &Boost.Threads; modeled after (specific library
|
||||
name)?</para>
|
||||
</question>
|
||||
<answer>
|
||||
<para>It wasn't. &Boost.Threads; was designed from scratch. Extensive
|
||||
design discussions involved numerous people representing a wide range of
|
||||
experience across many platforms. To ensure portability, the initial
|
||||
implements were done in parallel using POSIX Threads and the Win32
|
||||
threading API. But the &Boost.Threads; design is very much in the spirit
|
||||
of C++, and thus doesn't model such C based APIs.</para>
|
||||
</answer>
|
||||
</qandaentry>
|
||||
<qandaentry>
|
||||
<question>
|
||||
<para>Why wasn't &Boost.Threads; modeled after (specific library
|
||||
name)?</para>
|
||||
</question>
|
||||
<answer>
|
||||
<para>Existing C++ libraries either seemed dangerous (often failing to
|
||||
take advantage of prior art to reduce errors) or had excessive
|
||||
dependencies on library components unrelated to threading. Existing C
|
||||
libraries couldn't meet our C++ requirements, and were also missing
|
||||
certain features. For instance, the WIN32 thread API lacks condition
|
||||
variables, even though these are critical for the important Monitor
|
||||
pattern &cite.SchmidtStalRohnertBuschmann;.</para>
|
||||
</answer>
|
||||
</qandaentry>
|
||||
<qandaentry>
|
||||
<question>
|
||||
<para>Why do <link linkend="threads.concepts.mutexes">Mutexes</link>
|
||||
have noncopyable semantics?</para>
|
||||
</question>
|
||||
<answer>
|
||||
<para>To ensure that <link
|
||||
linkend="threads.glossary.deadlock">deadlocks</link> don't occur. The
|
||||
only logical form of copy would be to use some sort of shallow copy
|
||||
semantics in which multiple mutex objects could refer to the same mutex
|
||||
state. This means that if ObjA has a mutex object as part of its state
|
||||
and ObjB is copy constructed from it, then when ObjB::foo() locks the
|
||||
mutex it has effectively locked ObjA as well. This behavior can result
|
||||
in deadlock. Other copy semantics result in similar problems (if you
|
||||
think you can prove this to be wrong then supply us with an alternative
|
||||
and we'll reconsider).</para>
|
||||
</answer>
|
||||
</qandaentry>
|
||||
<qandaentry>
|
||||
<question>
|
||||
<para>How can you prevent <link
|
||||
linkend="threads.glossary.deadlock">deadlock</link> from occurring when
|
||||
a thread must lock multiple mutexes?</para>
|
||||
</question>
|
||||
<answer>
|
||||
<para>Always lock them in the same order. One easy way of doing this is
|
||||
to use each mutex's address to determine the order in which they are
|
||||
locked. A future &Boost.Threads; concept may wrap this pattern up in a
|
||||
reusable class.</para>
|
||||
</answer>
|
||||
</qandaentry>
|
||||
<qandaentry>
|
||||
<question>
|
||||
<para>Don't noncopyable <link
|
||||
linkend="threads.concepts.mutexes">Mutex</link> semantics mean that a
|
||||
class with a mutex member will be noncopyable as well?</para>
|
||||
</question>
|
||||
<answer>
|
||||
<para>No, but what it does mean is that the compiler can't generate a
|
||||
copy constructor and assignment operator, so they will have to be coded
|
||||
explicitly. This is a <emphasis role="bold">good thing</emphasis>,
|
||||
however, since the compiler generated operations would not be <link
|
||||
linkend="threads.glossary.thread-safe">thread-safe</link>. The following
|
||||
is a simple example of a class with copyable semantics and internal
|
||||
synchronization through a mutex member.</para>
|
||||
<programlisting>
|
||||
class counter
|
||||
{
|
||||
public:
|
||||
// Doesn't need synchronization since there can be no references to *this
|
||||
// until after it's constructed!
|
||||
explicit counter(int initial_value)
|
||||
: m_value(initial_value)
|
||||
{
|
||||
}
|
||||
// We only need to synchronize other for the same reason we don't have to
|
||||
// synchronize on construction!
|
||||
counter(const counter& other)
|
||||
{
|
||||
boost::mutex::scoped_lock scoped_lock(other.m_mutex);
|
||||
m_value = other.m_value;
|
||||
}
|
||||
// For assignment we need to synchronize both objects!
|
||||
const counter& operator=(const counter& other)
|
||||
{
|
||||
if (this == &other)
|
||||
return *this;
|
||||
boost::mutex::scoped_lock lock1(&m_mutex < &other.m_mutex ? m_mutex : other.m_mutex);
|
||||
boost::mutex::scoped_lock lock2(&m_mutex > &other.m_mutex ? m_mutex : other.m_mutex);
|
||||
m_value = other.m_value;
|
||||
return *this;
|
||||
}
|
||||
int value() const
|
||||
{
|
||||
boost::mutex::scoped_lock scoped_lock(m_mutex);
|
||||
return m_value;
|
||||
}
|
||||
int increment()
|
||||
{
|
||||
boost::mutex::scoped_lock scoped_lock(m_mutex);
|
||||
return ++m_value;
|
||||
}
|
||||
private:
|
||||
mutable boost::mutex m_mutex;
|
||||
int m_value;
|
||||
};
|
||||
</programlisting>
|
||||
</answer>
|
||||
</qandaentry>
|
||||
<qandaentry>
|
||||
<question>
|
||||
<para>How can you lock a <link
|
||||
linkend="threads.concepts.mutexes">Mutex</link> member in a const member
|
||||
function, in order to implement the Monitor Pattern?</para>
|
||||
</question>
|
||||
<answer>
|
||||
<para>The Monitor Pattern &cite.SchmidtStalRohnertBuschmann; mutex
|
||||
should simply be declared as mutable. See the example code above. The
|
||||
internal state of mutex types could have been made mutable, with all
|
||||
lock calls made via const functions, but this does a poor job of
|
||||
documenting the actual semantics (and in fact would be incorrect since
|
||||
the logical state of a locked mutex clearly differs from the logical
|
||||
state of an unlocked mutex). Declaring a mutex member as mutable clearly
|
||||
documents the intended semantics.</para>
|
||||
</answer>
|
||||
</qandaentry>
|
||||
<qandaentry>
|
||||
<question>
|
||||
<para>Why supply <classname>boost::condition</classname> variables rather than
|
||||
event variables?</para>
|
||||
</question>
|
||||
<answer>
|
||||
<para>Condition variables result in user code much less prone to <link
|
||||
linkend="threads.glossary.race-condition">race conditions</link> than
|
||||
event variables. See <xref linkend="threads.rationale.events" />
|
||||
for analysis. Also see &cite.Hoare74; and &cite.SchmidtStalRohnertBuschmann;.
|
||||
</para>
|
||||
</answer>
|
||||
</qandaentry>
|
||||
<qandaentry>
|
||||
<question>
|
||||
<para>Why isn't thread cancellation or termination provided?</para>
|
||||
</question>
|
||||
<answer>
|
||||
<para>There's a valid need for thread termination, so at some point
|
||||
&Boost.Threads; probably will include it, but only after we can find a
|
||||
truly safe (and portable) mechanism for this concept.</para>
|
||||
</answer>
|
||||
</qandaentry>
|
||||
<qandaentry>
|
||||
<question>
|
||||
<para>Is it safe for threads to share automatic storage duration (stack)
|
||||
objects via pointers or references?</para>
|
||||
</question>
|
||||
<answer>
|
||||
<para>Only if you can guarantee that the lifetime of the stack object
|
||||
will not end while other threads might still access the object. Thus the
|
||||
safest practice is to avoid sharing stack objects, particularly in
|
||||
designs where threads are created and destroyed dynamically. Restrict
|
||||
sharing of stack objects to simple designs with very clear and
|
||||
unchanging function and thread lifetimes. (Suggested by Darryl
|
||||
Green).</para>
|
||||
</answer>
|
||||
</qandaentry>
|
||||
<qandaentry>
|
||||
<question>
|
||||
<para>Why has class semaphore disappeared?</para>
|
||||
</question>
|
||||
<answer>
|
||||
<para>Semaphore was removed as too error prone. The same effect can be
|
||||
achieved with greater safety by the combination of a mutex and a
|
||||
condition variable.</para>
|
||||
</answer>
|
||||
</qandaentry>
|
||||
</qandaset>
|
||||
</section>
|
||||
300
doc/glossary.xml
Normal file
300
doc/glossary.xml
Normal file
@@ -0,0 +1,300 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<glossary id="threads.glossary" last-revision="$Date$">
|
||||
<title>Glossary</title>
|
||||
<para>Definitions are given in terms of the C++ Standard
|
||||
&cite.ISO98;. References to the standard are in the form [1.2.3/4], which
|
||||
represents the section number, with the paragraph number following the
|
||||
"/".</para>
|
||||
<para>Because the definitions are written in something akin to "standardese",
|
||||
they can be difficult to understand. The intent isn't to confuse, but rather
|
||||
to clarify the additional requirements &Boost.Threads; places on a C++
|
||||
implementation as defined by the C++ Standard.</para>
|
||||
<glossentry id="threads.glossary.thread">
|
||||
<glossterm>Thread</glossterm>
|
||||
<glossdef>
|
||||
<para>Thread is short for "thread of execution". A thread of execution is
|
||||
an execution environment [1.9/7] within the execution environment of a C++
|
||||
program [1.9]. The main() function [3.6.1] of the program is the initial
|
||||
function of the initial thread. A program in a multithreading environment
|
||||
always has an initial thread even if the program explicitly creates no
|
||||
additional threads.</para>
|
||||
<para>Unless otherwise specified, each thread shares all aspects of its
|
||||
execution environment with other threads in the program. Shared aspects of
|
||||
the execution environment include, but are not limited to, the
|
||||
following:</para>
|
||||
<itemizedlist>
|
||||
<listitem><para>Static storage duration (static, extern) objects
|
||||
[3.7.1].</para></listitem>
|
||||
<listitem><para>Dynamic storage duration (heap) objects [3.7.3]. Thus
|
||||
each memory allocation will return a unique addresses, regardless of the
|
||||
thread making the allocation request.</para></listitem>
|
||||
<listitem><para>Automatic storage duration (stack) objects [3.7.2]
|
||||
accessed via pointer or reference from another thread.</para></listitem>
|
||||
<listitem><para>Resources provided by the operating system. For example,
|
||||
files.</para></listitem>
|
||||
<listitem><para>The program itself. In other words, each thread is
|
||||
executing some function of the same program, not a totally different
|
||||
program.</para></listitem>
|
||||
</itemizedlist>
|
||||
<para>Each thread has its own:</para>
|
||||
<itemizedlist>
|
||||
<listitem><para>Registers and current execution sequence (program
|
||||
counter) [1.9/5].</para></listitem>
|
||||
<listitem><para>Automatic storage duration (stack) objects
|
||||
[3.7.2].</para></listitem>
|
||||
</itemizedlist>
|
||||
</glossdef>
|
||||
</glossentry>
|
||||
<glossentry id="threads.glossary.thread-safe">
|
||||
<glossterm>Thread-safe</glossterm>
|
||||
<glossdef>
|
||||
<para>A program is thread-safe if it has no <link
|
||||
linkend="threads.glossary.race-condition">race conditions</link>, does
|
||||
not <link linkend="threads.glossary.deadlock">deadlock</link>, and has
|
||||
no <link linkend="threads.glossary.priority-failure">priority
|
||||
failures</link>.</para>
|
||||
<para>Note that thread-safety does not necessarily imply efficiency, and
|
||||
than while some thread-safety violations can be determined statically at
|
||||
compile time, many thread-safety errors can only only be detected at
|
||||
runtime.</para>
|
||||
</glossdef>
|
||||
</glossentry>
|
||||
<glossentry id="threads.glossary.thread-state">
|
||||
<glossterm>Thread State</glossterm>
|
||||
<glossdef>
|
||||
<para>During the lifetime of a thread, it shall be in one of the following
|
||||
states:</para>
|
||||
<table>
|
||||
<title>Thread States</title>
|
||||
<tgroup cols="2" align="left">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>State</entry>
|
||||
<entry>Description</entry>
|
||||
</row>
|
||||
</thead>
|
||||
<tbody>
|
||||
<row>
|
||||
<entry>Ready</entry>
|
||||
<entry>Ready to run, but waiting for a processor.</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>Running</entry>
|
||||
<entry>Currently executing on a processor. Zero or more threads
|
||||
may be running at any time, with a maximum equal to the number of
|
||||
processors.</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>Blocked</entry>
|
||||
<entry>Waiting for some resource other than a processor which is
|
||||
not currently available, or for the completion of calls to library
|
||||
functions [1.9/6]. The term "waiting" is synonymous with
|
||||
"blocked"</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>Terminated</entry>
|
||||
<entry>Finished execution but not yet detached or joined.</entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
<para>Thread state transitions shall occur only as specified:</para>
|
||||
<table>
|
||||
<title>Thread States Transitions</title>
|
||||
<tgroup cols="3" align="left">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>From</entry>
|
||||
<entry>To</entry>
|
||||
<entry>Cause</entry>
|
||||
</row>
|
||||
</thead>
|
||||
<tbody>
|
||||
<row>
|
||||
<entry>[none]</entry>
|
||||
<entry>Ready</entry>
|
||||
<entry><para>Thread is created by a call to a library function.
|
||||
In the case of the initial thread, creation is implicit and
|
||||
occurs during the startup of the main() function [3.6.1].</para></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>Ready</entry>
|
||||
<entry>Running</entry>
|
||||
<entry><para>Processor becomes available.</para></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>Running</entry>
|
||||
<entry>Ready</entry>
|
||||
<entry>Thread preempted.</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>Running</entry>
|
||||
<entry>Blocked</entry>
|
||||
<entry>Thread calls a library function which waits for a resource or
|
||||
for the completion of I/O.</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>Running</entry>
|
||||
<entry>Terminated</entry>
|
||||
<entry>Thread returns from its initial function, calls a thread
|
||||
termination library function, or is canceled by some other thread
|
||||
calling a thread termination library function.</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>Blocked</entry>
|
||||
<entry>Ready</entry>
|
||||
<entry>The resource being waited for becomes available, or the
|
||||
blocking library function completes.</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>Terminated</entry>
|
||||
<entry>[none]</entry>
|
||||
<entry>Thread is detached or joined by some other thread calling the
|
||||
appropriate library function, or by program termination
|
||||
[3.6.3].</entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
<para>[Note: if a suspend() function is added to the threading library,
|
||||
additional transitions to the blocked state will have to be added to the
|
||||
above table.]</para>
|
||||
</glossdef>
|
||||
</glossentry>
|
||||
<glossentry id="threads.glossary.race-condition">
|
||||
<glossterm>Race Condition</glossterm>
|
||||
<glossdef>
|
||||
<para>A race condition is what occurs when multiple threads read from and write
|
||||
to the same memory without proper synchronization, resulting in an incorrect
|
||||
value being read or written. The result of a race condition may be a bit
|
||||
pattern which isn't even a valid value for the data type. A race condition
|
||||
results in undefined behavior [1.3.12].</para>
|
||||
<para>Race conditions can be prevented by serializing memory access using
|
||||
the tools provided by &Boost.Threads;.</para>
|
||||
</glossdef>
|
||||
</glossentry>
|
||||
<glossentry id="threads.glossary.deadlock">
|
||||
<glossterm>Deadlock</glossterm>
|
||||
<glossdef>
|
||||
<para>Deadlock is an execution state where for some set of threads, each
|
||||
thread in the set is blocked waiting for some action by one of the other
|
||||
threads in the set. Since each is waiting on the others, none will ever
|
||||
become ready again.</para>
|
||||
</glossdef>
|
||||
</glossentry>
|
||||
<glossentry id="threads.glossary.starvation">
|
||||
<glossterm>Starvation</glossterm>
|
||||
<glossdef>
|
||||
<para>The condition in which a thread is not making sufficient progress in
|
||||
its work during a given time interval.</para>
|
||||
</glossdef>
|
||||
</glossentry>
|
||||
<glossentry id="threads.glossary.priority-failure">
|
||||
<glossterm>Priority Failure</glossterm>
|
||||
<glossdef>
|
||||
<para>A priority failure (such as priority inversion or infinite overtaking)
|
||||
occurs when threads are executed in such a sequence that required work is not
|
||||
performed in time to be useful.</para>
|
||||
</glossdef>
|
||||
</glossentry>
|
||||
<glossentry id="threads.glossary.undefined-behavior">
|
||||
<glossterm>Undefined Behavior</glossterm>
|
||||
<glossdef>
|
||||
<para>The result of certain operations in &Boost.Threads; is undefined;
|
||||
this means that those operations can invoke almost any behavior when
|
||||
they are executed.</para>
|
||||
|
||||
<para>An operation whose behavior is undefined can work "correctly"
|
||||
in some implementations (i.e., do what the programmer thought it
|
||||
would do), while in other implementations it may exhibit almost
|
||||
any "incorrect" behavior--such as returning an invalid value,
|
||||
throwing an exception, generating an access violation, or terminating
|
||||
the process.</para>
|
||||
|
||||
<para>Executing a statement whose behavior is undefined is a
|
||||
programming error.</para>
|
||||
</glossdef>
|
||||
</glossentry>
|
||||
<glossentry id="threads.glossary.memory-visibility">
|
||||
<glossterm>Memory Visibility</glossterm>
|
||||
<glossdef>
|
||||
<para>An address [1.7] shall always point to the same memory byte,
|
||||
regardless of the thread or processor dereferencing the address.</para>
|
||||
<para>An object [1.8, 1.9] is accessible from multiple threads if it is of
|
||||
static storage duration (static, extern) [3.7.1], or if a pointer or
|
||||
reference to it is explicitly or implicitly dereferenced in multiple
|
||||
threads.</para>
|
||||
<para>For an object accessible from multiple threads, the value of the
|
||||
object accessed from one thread may be indeterminate or different from the
|
||||
value accessed from another thread, except under the conditions specified in
|
||||
the following table. For the same row of the table, the value of an object
|
||||
accessible at the indicated sequence point in thread A will be determinate
|
||||
and the same if accessed at or after the indicated sequence point in thread
|
||||
B, provided the object is not otherwise modified. In the table, the
|
||||
"sequence point at a call" is the sequence point after the evaluation of all
|
||||
function arguments [1.9/17], while the "sequence point after a call" is the
|
||||
sequence point after the copying of the returned value... [1.9/17].</para>
|
||||
<table>
|
||||
<title>Memory Visibility</title>
|
||||
<tgroup cols="2">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Thread A</entry>
|
||||
<entry>Thread B</entry>
|
||||
</row>
|
||||
</thead>
|
||||
<tbody>
|
||||
<row>
|
||||
<entry>The sequence point at a call to a library thread-creation
|
||||
function.</entry>
|
||||
<entry>The first sequence point of the initial function in the new
|
||||
thread created by the Thread A call.</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>The sequence point at a call to a library function which
|
||||
locks a mutex, directly or by waiting for a condition
|
||||
variable.</entry>
|
||||
<entry>The sequence point after a call to a library function which
|
||||
unlocks the same mutex.</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>The last sequence point before thread termination.</entry>
|
||||
<entry>The sequence point after a call to a library function which
|
||||
joins the terminated thread.</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>The sequence point at a call to a library function which
|
||||
signals or broadcasts a condition variable.</entry>
|
||||
<entry>The sequence point after the call to the library function
|
||||
which was waiting on that same condition variable or signal.</entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
<para>The architecture of the execution environment and the observable
|
||||
behavior of the abstract machine [1.9] shall be the same on all
|
||||
processors.</para>
|
||||
<para>The latitude granted by the C++ standard for an implementation to
|
||||
alter the definition of observable behavior of the abstract machine to
|
||||
include additional library I/O functions [1.9/6] is extended to include
|
||||
threading library functions.</para>
|
||||
<para>When an exception is thrown and there is no matching exception handler
|
||||
in the same thread, behavior is undefined. The preferred behavior is the
|
||||
same as when there is no matching exception handler in a program
|
||||
[15.3/9]. That is, terminate() is called, and it is implementation-defined
|
||||
whether or not the stack is unwound.</para>
|
||||
</glossdef>
|
||||
</glossentry>
|
||||
<section>
|
||||
<title>Acknowledgements</title>
|
||||
<para>This document was originally written by Beman Dawes, and then much
|
||||
improved by the incorporation of comments from William Kempf, who now
|
||||
maintains the contents.</para>
|
||||
<para>The visibility rules are based on &cite.Butenhof97;.</para>
|
||||
</section>
|
||||
</glossary>
|
||||
34
doc/implementation_notes.xml
Normal file
34
doc/implementation_notes.xml
Normal file
@@ -0,0 +1,34 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<section id="threads.implementation_notes" last-revision="$Date$">
|
||||
<title>Implementation Notes</title>
|
||||
<section id="threads.implementation_notes.win32">
|
||||
<title>Win32</title>
|
||||
<para>
|
||||
In the current Win32 implementation, creating a boost::thread object
|
||||
during dll initialization will result in deadlock because the thread
|
||||
class constructor causes the current thread to wait on the thread that
|
||||
is being created until it signals that it has finished its initialization,
|
||||
and, as stated in the
|
||||
<ulink url="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/dllmain.asp">MSDN Library, "DllMain" article, "Remarks" section</ulink>,
|
||||
"Because DLL notifications are serialized, entry-point functions should not
|
||||
attempt to communicate with other threads or processes. Deadlocks may occur as a result."
|
||||
(Also see <ulink url="http://www.microsoft.com/msj/archive/S220.aspx">"Under the Hood", January 1996</ulink>
|
||||
for a more detailed discussion of this issue).
|
||||
</para>
|
||||
<para>
|
||||
The following non-exhaustive list details some of the situations that
|
||||
should be avoided until this issue can be addressed:
|
||||
<itemizedlist>
|
||||
<listitem>Creating a boost::thread object in DllMain() or in any function called by it.</listitem>
|
||||
<listitem>Creating a boost::thread object in the constructor of a global static object or in any function called by one.</listitem>
|
||||
<listitem>Creating a boost::thread object in MFC's CWinApp::InitInstance() function or in any function called by it.</listitem>
|
||||
<listitem>Creating a boost::thread object in the function pointed to by MFC's _pRawDllMain function pointer or in any function called by it.</listitem>
|
||||
</itemizedlist>
|
||||
</para>
|
||||
</section>
|
||||
</section>
|
||||
154
doc/index.html
154
doc/index.html
@@ -1,156 +1,8 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads</title>
|
||||
<meta http-equiv="refresh" content="0; URL=../../../doc/html/threads.html">
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Index</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<h2>Contents</h2>
|
||||
<dl class="index">
|
||||
<dt><a href="overview.html">Overview</a></dt>
|
||||
<dt><a href="mutex_concept.html">Mutex Concepts</a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="mutex_concept.html#Mutex">Mutex</a></dt>
|
||||
<dt><a href="mutex_concept.html#TryMutex">TryMutex</a></dt>
|
||||
<dt><a href="mutex_concept.html#TimedMutex">TimedMutex</a></dt>
|
||||
</dl>
|
||||
<dt><a href="lock_concept.html">Lock Concepts</a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="lock_concept.html#Lock">Lock</a></dt>
|
||||
<dt><a href="lock_concept.html#ScopedLock">ScopedLock</a></dt>
|
||||
<dt><a href="lock_concept.html#ScopedTryLock">ScopedTryLock</a></dt>
|
||||
<dt><a href="lock_concept.html#ScopedTimedLock">ScopedTimedLock</a></dt>
|
||||
</dl>
|
||||
<dt>Reference</dt>
|
||||
<dl class="index">
|
||||
<dt><a href="condition.html"><code><boost/thread/condition.hpp></code></a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="condition.html#classes">Classes</a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="condition.html#class-condition"><code>condition</code></a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
</dl>
|
||||
<dl class="index">
|
||||
<dt><a href="exceptions.html"><code><boost/thread/exceptions.hpp></code></a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="exceptions.html#classes">Classes</a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="exceptions.html#class-lock_error"><code>lock_error</code></a></dt>
|
||||
<dt><a href="exceptions.html#class-thread_resource_error"><code>thread_resource_error</code></a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
</dl>
|
||||
<dl class="index">
|
||||
<dt><a href="mutex.html"><code><boost/thread/mutex.hpp></code></a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="mutex.html#classes">Classes</a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="mutex.html#class-mutex"><code>mutex</code></a></dt>
|
||||
<dt><a href="mutex.html#class-try_mutex"><code>try_mutex</code></a></dt>
|
||||
<dt><a href="mutex.html#class-timed_mutex"><code>timed_mutex</code></a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
</dl>
|
||||
<dl class="index">
|
||||
<dt><a href="once.html"><code><boost/thread/once.hpp></code></a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="once.html#macros">Macros</a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="once.html#macro-BOOST_ONCE_INIT"><code>BOOST_ONCE_INIT</code></a></dt>
|
||||
</dl>
|
||||
<dt><a href="once.html#types">Types</a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="once.html#type-once_flag"><code>once_flag</code></a></dt>
|
||||
</dl>
|
||||
<dt><a href="once.html#functions">Functions</a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="once.html#function-call_once"><code>call_once</code></a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
</dl>
|
||||
<dl class="index">
|
||||
<dt><a href="recursive_mutex.html"><code><boost/thread/recursive_mutex.hpp></code></a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="recursive_mutex.html#classes">Classes</a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="recursive_mutex.html#class-recursive_mutex"><code>recursive_mutex</code></a></dt>
|
||||
<dt><a href="recursive_mutex.html#class-recursive_try_mutex"><code>recursive_try_mutex</code></a></dt>
|
||||
<dt><a href="recursive_mutex.html#class-recursive_timed_mutex"><code>recursive_timed_mutex</code></a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
</dl>
|
||||
<dl class="index">
|
||||
<dt><a href="thread.html"><code><boost/thread/thread.hpp></code></a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="thread.html#classes">Classes</a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="thread.html#class-thread"><code>thread</code></a></dt>
|
||||
<dt><a href="thread.html#class-thread_group"><code>thread_group</code></a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
</dl>
|
||||
<dl class="index">
|
||||
<dt><a href="tss.html"><code><boost/thread/tss.hpp></code></a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="tss.html#classes">Classes</a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="tss.html#class-thread_specific_ptr"><code>thread_specific_ptr</code></a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
</dl>
|
||||
<dl class="index">
|
||||
<dt><a href="xtime.html"><code><boost/thread/xtime.hpp></code></a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="xtime.html#values">Values</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="xtime.html#value-spec"><code>TIME_UTC</code></a></dt>
|
||||
</dl>
|
||||
<dt><a href="xtime.html#classes">Classes</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="xtime.html#class-xtime"><code>xtime</code></a></dt>
|
||||
</dl>
|
||||
<dt><a href="xtime.html#functions">Functions</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="xtime.html#function-xtime_get"><code>xtime_get</code></a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
</dl>
|
||||
<dt><a href="configuration.html">Configuration Information</a></dt>
|
||||
<dt><a href="build.html">Building and Testing</a></dt>
|
||||
<dt><a href="introduction.html">Introduction to Design</a></dt>
|
||||
<dt><a href="rationale.html">Rationale</a></dt>
|
||||
<dt><a href="definitions.html">Definitions</a></dt>
|
||||
<dt><a href="faq.html">Frequently Asked Questions (FAQs)</a></dt>
|
||||
<dt><a href="bibliography.html">Bibliography</a></dt>
|
||||
<dt><a href="acknowledgments.html">Acknowledgments</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2001
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
<body>
|
||||
Automatic redirection failed, please go to <a href="../../../doc/html/threads.html">../../../doc/html/threads.html</a>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
@@ -1,159 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - Introduction to Design</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Introduction to Design</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#motivation">Motivation</a></dt>
|
||||
<dt><a href="#goals">Goals</a></dt>
|
||||
<dt><a href="#phases">Iterative Phases</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#phase1">Phase 1, Synchronization Primitives</a></dt>
|
||||
<dt><a href="#phase2">Phase 2, Thread Management and Thread Specific Storage</a></dt>
|
||||
<dt><a href="#next-phase">The Next Phase</a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
<h2><a name="motivation"></a>Motivation</h2>
|
||||
<p>With client/server and three-tier architectures becoming common place in today's
|
||||
world, it's becoming increasingly important for programs to be able to handle
|
||||
parallel processing. Modern day operating systems usually provide some support
|
||||
for this through native thread APIs. Unfortunately, writing portable code that
|
||||
makes use of parallel processing in C++ is made very difficult by a lack of
|
||||
a standard interface for these native APIs. Further, these APIs are almost universally
|
||||
C APIs and fail to take advantage of C++'s strengths, or to address C++'s
|
||||
issues.</p>
|
||||
<p>The <b>Boost.Threads</b> library is an attempt to define a portable interface
|
||||
for writing parallel processes in C++.</p>
|
||||
<h2><a name="goals"></a>Goals</h2>
|
||||
<p>The <b>Boost.Threads</b> library has several goals that should help to set
|
||||
it apart from other solutions. These goals are listed in order of precedence
|
||||
with full descriptions below.</p>
|
||||
<ul>
|
||||
<li> <b>Portability</b>
|
||||
<p><b>Boost.Threads</b> was designed to be highly portable. The goal is for
|
||||
the interface to be easily implemented on any platform that supports threads,
|
||||
and possibly even on platforms without native thread support.</p>
|
||||
</li>
|
||||
<li> <b>Safety</b>
|
||||
<p><b>Boost.Threads</b> was designed to be as safe as possible. Writing <a href="definitions.html#Thread-safe">thread-safe</a>
|
||||
code is very difficult and successful libraries must strive to insulate
|
||||
the programmer from dangerous constructs as much as possible. This is accomplished
|
||||
in several ways:</p>
|
||||
<ul>
|
||||
<li>
|
||||
<p align="left">C++ language features are used make correct usage easy
|
||||
(if possible, the default) and error-prone impossible or at least more
|
||||
difficult. For example, see the <a href="mutex_concept.html">Mutex</a>
|
||||
and <a href="lock_concept.html">Lock</a> designs, and how note how they
|
||||
interact.</p>
|
||||
</li>
|
||||
<li>
|
||||
<p align="left">Certain traditional concurrent programming features are
|
||||
considered so error-prone that they are not provided at all. For example,
|
||||
see the <a
|
||||
href="rationale.html#Events">Events Not Provided</a> rationale.</p>
|
||||
</li>
|
||||
<li>
|
||||
<p align="left">Dangerous features, or features which may be misused,
|
||||
are identified as such in the documentation to make users aware of potential
|
||||
pitfalls.</p>
|
||||
</li>
|
||||
</ul>
|
||||
</li>
|
||||
<li> <b>Flexibility</b>
|
||||
<p><b>Boost.Threads</b> was designed to be flexible. This goal is often at
|
||||
odds with <i>safety</i>. When functionality might be compromised by the
|
||||
desire to keep the interface safe, <b> Boost.Threads</b> has been designed
|
||||
to provide the functionality, but to make it's use prohibitive for general
|
||||
use. In other words, the interfaces have been designed such that it's usually
|
||||
obvious when something is unsafe, and the documentation is written to explain
|
||||
why.</p>
|
||||
</li>
|
||||
<li> <b>Efficiency</b>
|
||||
<p><b>Boost.Threads</b> was designed to be as efficient as possible. When
|
||||
building a library on top of another library there is always a danger that
|
||||
the result will be so much slower than the "native" API that programmers
|
||||
are inclined to ignore the higher level API. <b>Boost.Threads</b> was designed
|
||||
to minimize the chances of this occurring. The interfaces have been crafted
|
||||
to allow an implementation the greatest chance of being as efficient as
|
||||
possible. This goal is often at odds with the goal for <i>safety</i>. Every
|
||||
effort was made to ensure efficient implementations, but when in conflict
|
||||
<i>safety</i> has always taken precedence.</p>
|
||||
</li>
|
||||
</ul>
|
||||
<h2><a name="phases"></a>Iterative Phases</h2>
|
||||
<p>Another goal of <b>Boost.Threads</b> was to take a dynamic, iterative approach
|
||||
in its development. The computing industry is still exploring the concepts of
|
||||
parallel programming. Most thread libraries supply only simple primitive concepts
|
||||
for thread synchronization. These concepts are very simple, but they are very
|
||||
difficult to use safely or to provide formal proofs for constructs built on
|
||||
top of them. There has been a lot of research in other concepts, such as in
|
||||
"Communicating Sequential Processes." <b>Boost.Threads</b> was designed
|
||||
in iterative steps, providing the building blocks necessary for the next step,
|
||||
and giving the researcher the tools necessary to explore new concepts in a portable
|
||||
manner.</p>
|
||||
<p>Given the goal of following a dynamic, iterative approach <b> Boost.Threads</b>
|
||||
shall go through several growth cycles. Each phase in its development shall
|
||||
be roughly documented here.</p>
|
||||
<h3><a name="phase1"></a>Phase 1, Synchronization Primitives</h3>
|
||||
<p>Boost is all about providing high quality libraries with implementations for
|
||||
many platforms. Unfortunately, there's a big problem faced by developers
|
||||
wishing to supply such high quality libraries, namely thread-safety. The C++
|
||||
standard doesn't address threads at all, but real world programs often make
|
||||
use of native threading support. A portable library that doesn't address
|
||||
the issue of thread-safety is there for not much help to a programmer who wants
|
||||
to use the library in his multithreaded application. So there's a very great
|
||||
need for portable primitives that will allow the library developer to create
|
||||
<a href="definitions.html#Thread-safe"> thread-safe</a> implementations. This
|
||||
need far out weighs the need for portable methods to create and manage threads.</p>
|
||||
<p>Because of this need, the first phase of <b>Boost.Threads</b> focuses solely
|
||||
on providing portable primitive concepts for thread synchronization. Types provided
|
||||
in this phase include the <a href="mutex.html"> mutex/try_mutex/timed_mutex</a>,
|
||||
<a href="recursive_mutex.html"> recursive_mutex/recursive_try_mutex/recursive_timed_mutex</a>
|
||||
and <a href="exceptions.html#class-lock_error">lock_error</a>. These are considered
|
||||
the "core" synchronization primitives, though there are others that
|
||||
will be added in later phases.</p>
|
||||
<h3><a name="phase2"></a>Phase 2, Thread Management and Thread Specific Storage</h3>
|
||||
<p>This phase addresses the creation and management of threads and provides a
|
||||
mechanism for thread specific storage (data associated with a thread instance).
|
||||
Thread management is a tricky issue in C++, so this phase addresses only the
|
||||
basic needs of multithreaded program. Later phases are likely to add additional
|
||||
functionality in this area. This phase of <b>Boost.Threads</b> adds the <a href="thread.html">thread</a>
|
||||
and <a href="tss.html#class-thread_specific_ptr">thread_specific_ptr</a> types.
|
||||
With these additions the <b>Boost.Threads</b> library can be considered minimal
|
||||
but complete.</p>
|
||||
<h3><a name="next-phase"></a>The Next Phase</h3>
|
||||
<p>The next phase will address more advanced synchronization concepts, such as
|
||||
read/write mutexes and barriers.</p>
|
||||
<hr>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2001
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
@@ -1,194 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - ScopedLock Concept</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">ScopedLock Concept</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#concept-requirements">Concept Requirements</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#Lock-concept">Lock Concept</a></dt>
|
||||
<dt><a href="#ScopedLock-concept">ScopedLock Concept</a></dt>
|
||||
<dt><a href="#ScopedTryLock-concept">ScopedTryLock Concept</a></dt>
|
||||
<dt><a href="#ScopedTimedLock-concept">ScopedTimedLock Concept</a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p>A lock object provides a safe means for locking and unlocking a mutex object
|
||||
(an object whose type is a model of <a href="mutex_concept.html">Mutex</a> or
|
||||
one of its refinements). In other words they are an implementation of the <i>Scoped
|
||||
Locking</i> <a href="bibliography.html#Schmidt-00">[Schmidt 00]</a> pattern.
|
||||
The <a href="#ScopedLock-concept">ScopedLock</a> concept, with <a href="#ScopedTryLock-concept">ScopedTryLock</a>
|
||||
and <a href="#ScopedTimedLock-concept">ScopedTimedLock</a> refinements, formalize
|
||||
the requirements.</p>
|
||||
<p>Lock objects are constructed with a reference to a mutex object and typically
|
||||
acquire ownership of the mutex object by setting its state to locked. They also
|
||||
ensure ownership is relinquished in the destructor. Lock objects also expose
|
||||
functions to query the lock status and to manually lock and unlock the mutex
|
||||
object.</p>
|
||||
<p>Lock objects are meant to be short lived, expected to be used at block scope
|
||||
only. The lock objects are not <a href="definitions.html#definition-thread-safe">thread-safe</a>.
|
||||
Lock objects must maintain state to indicate whether or not they've been
|
||||
locked and this state is not protected by any synchronization concepts. For
|
||||
this reason a lock object should never be shared between multiple threads.</p>
|
||||
<h2><a name="concept-requirements"></a>Concept Requirements</h2>
|
||||
<h3><a name="Lock-concept"></a>Lock Concept</h3>
|
||||
<p>For a Lock type <code>L</code> and an object <code>lk</code> and const object
|
||||
<code>clk</code> of that type, the following expressions must be well-formed
|
||||
and have the indicated effects.</p>
|
||||
<table summary="Lock expressions" border="1" cellpadding="5">
|
||||
<tr>
|
||||
<td><b>Expression</b></td>
|
||||
<td><b>Effects</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code>(&lk)->~L();</code></td>
|
||||
<td><code>if (locked()) unlock();</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code>(&clk)->operator const void*()</code></td>
|
||||
<td>Returns type void*, non-zero if if the associated mutex object has been
|
||||
locked by <code>clk</code>, otherwise 0.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code>clk.locked()</code></td>
|
||||
<td>Returns a <code>bool</code>, <code>(&clk)->operator const void*()
|
||||
!= 0</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code>lk.lock()</code></td>
|
||||
<td>Throws <code>lock_error</code> if <code>locked()</code>. If the associated
|
||||
mutex object is already locked by some other thread, places the current
|
||||
thread in the <a href="definitions.html#State">Blocked</a> state until the
|
||||
associated mutex is unlocked, after which the current thread is placed in
|
||||
the <a href="definitions.html#State"> Ready</a> state, eventually to be
|
||||
returned to the <a href="definitions.html#State">Running</a> state. If the
|
||||
associated mutex object is already locked by the same thread the behavior
|
||||
is dependent on the <a href="mutex_concept.html#locking-strategies">locking
|
||||
strategy</a> of the associated mutex object.<br>
|
||||
Postcondition: <code>locked() == true</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code>lk.unlock()</code></td>
|
||||
<td>If <code>!locked()</code>, throws <code>lock_error</code>, otherwise unlocks
|
||||
the associated mutex.<br>
|
||||
Postcondition: <code>!locked()</code></td>
|
||||
</tr>
|
||||
</table>
|
||||
<h3><a name="ScopedLock-concept"></a>ScopedLock Concept</h3>
|
||||
<p>A ScopedLock is a refinement of <a href="#Lock">Lock</a>. For a ScopedLock
|
||||
type <code>L</code> and an object <code>lk</code> of that type, and an object
|
||||
<code>m</code> of a type meeting the <a href="mutex_concept.html#Mutex-concept">Mutex</a>
|
||||
requirements, and an object <code>b</code> of type <code>bool</code>, the following
|
||||
expressions must be well-formed and have the indicated effects.</p>
|
||||
<table summary="ScopedLock expressions" border="1" cellpadding="5">
|
||||
<tr>
|
||||
<td><b>Expression</b></td>
|
||||
<td><b>Effects</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code>L lk(m);</code></td>
|
||||
<td>Constructs an object <code>lk</code>, and associates mutex object <code>m</code>
|
||||
with it, then calls <code>lock()</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code>L lk(m,b);</code></td>
|
||||
<td>Constructs an object <code>lk</code>, and associates mutex object <code>m</code>
|
||||
with it, then if <code>b</code>, calls <code>lock()</code></td>
|
||||
</tr>
|
||||
</table>
|
||||
<h3><a name="ScopedTryLock-concept"></a>ScopedTryLock Concept</h3>
|
||||
<p>A ScopedTryLock is a refinement of <a href="#Lock-concept">Lock</a>. For a
|
||||
ScopedTryLock type <code>L</code> and an object <code>lk</code> of that type,
|
||||
and an object <code>m</code> of a type meeting the <a href="mutex_concept.html#TryMutex-concept">TryMutex</a>
|
||||
requirements, and an object <code>b</code> of type <code>bool</code>, the following
|
||||
expressions must be well-formed and have the indicated effects.</p>
|
||||
<table summary="ScopedTryLock expressions" border="1" cellpadding="5">
|
||||
<tr>
|
||||
<td><b>Expression</b></td>
|
||||
<td><b>Effects</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code>L lk(m);</code></td>
|
||||
<td>Constructs an object <code>lk</code>, and associates mutex object <code>m</code>
|
||||
with it, then calls <code>try_lock()</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code>L lk(m,b);</code></td>
|
||||
<td>Constructs an object <code>lk</code>, and associates mutex object <code>m</code>
|
||||
with it, then if <code>b</code>, calls <code> lock()</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code>lk.try_lock()</code></td>
|
||||
<td>If locked(), throws <code>lock_error</code>. Makes a non-blocking attempt
|
||||
to lock the associated mutex object, returning <code>true</code> if the
|
||||
lock attempt is successful, otherwise <code>false</code>. If the associated
|
||||
mutex object is already locked by the same thread the behavior is dependent
|
||||
on the <a href="mutex_concept.html#locking-strategies">locking strategy</a>
|
||||
of the associated mutex object.</td>
|
||||
</tr>
|
||||
</table>
|
||||
<h3><a name="ScopedTimedLock-concept"></a>ScopedTimedLock Concept</h3>
|
||||
<p>A ScopedTimedLock is a refinement of <a href="#Lock">Lock</a>. For a ScopedTimedLock
|
||||
type <code>L</code> and an object <code>lk</code> of that type, and an object
|
||||
<code>m</code> of a type meeting the <a href="mutex_concept.html#TimedMutex">TimedMutex</a>
|
||||
requirements, and an object <code>b</code> of type <code>bool</code>, and an
|
||||
object <code>t</code> of type <code><a href="xtime.html"> xtime</a></code>,
|
||||
the following expressions must be well-formed and have the indicated effects.</p>
|
||||
<table summary="ScopedTimedLock expressions" border="1" cellpadding=
|
||||
"5">
|
||||
<tr>
|
||||
<td><b>Expression</b></td>
|
||||
<td><b>Effects</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code>L lk(m,t);</code></td>
|
||||
<td>Constructs an object <code>lk</code>, and associates mutex object <code>m</code>
|
||||
with it, then calls <code> timed_lock(t)</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code>L lk(m,b);</code></td>
|
||||
<td>Constructs an object <code>lk</code>, and associates mutex object <code>m</code>
|
||||
with it, then if <code>b</code>, calls <code> lock()</code></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code>lk.timed_lock(t)</code></td>
|
||||
<td>If locked(), throws lock_error. Makes a blocking attempt to lock the associated
|
||||
mutex object, and returns <code>true</code> if successful within the specified
|
||||
time <code>t</code>, otherwise <code>false</code>. If the associated mutex
|
||||
object is already locked by the same thread the behavior is dependent on
|
||||
the <a href="mutex_concept.html#locking-strategies">locking strategy</a>
|
||||
of the associated mutex object.</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2001
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
305
doc/mutex-ref.xml
Normal file
305
doc/mutex-ref.xml
Normal file
@@ -0,0 +1,305 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<header name="boost/thread/mutex.hpp"
|
||||
last-revision="$Date$">
|
||||
<namespace name="boost">
|
||||
<class name="mutex">
|
||||
<purpose>
|
||||
<para>The <classname>mutex</classname> class is a model of the
|
||||
<link linkend="threads.concepts.Mutex">Mutex</link> concept.</para>
|
||||
</purpose>
|
||||
|
||||
<description>
|
||||
<para>The <classname>mutex</classname> class is a model of the
|
||||
<link linkend="threads.concepts.Mutex">Mutex</link> concept.
|
||||
It should be used to synchronize access to shared resources using
|
||||
<link linkend="threads.concepts.unspecified-locking-strategy">Unspecified</link>
|
||||
locking mechanics.</para>
|
||||
|
||||
<para>For classes that model related mutex concepts, see
|
||||
<classname>try_mutex</classname> and <classname>timed_mutex</classname>.</para>
|
||||
|
||||
<para>For <link linkend="threads.concepts.recursive-locking-strategy">Recursive</link>
|
||||
locking mechanics, see <classname>recursive_mutex</classname>,
|
||||
<classname>recursive_try_mutex</classname>, and <classname>recursive_timed_mutex</classname>.
|
||||
</para>
|
||||
|
||||
<para>The <classname>mutex</classname> class supplies the following typedef,
|
||||
which <link linkend="threads.concepts.lock-models">models</link>
|
||||
the specified locking strategy:
|
||||
|
||||
<informaltable>
|
||||
<tgroup cols="2" align="left">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Lock Name</entry>
|
||||
<entry>Lock Concept</entry>
|
||||
</row>
|
||||
</thead>
|
||||
<tbody>
|
||||
<row>
|
||||
<entry>scoped_lock</entry>
|
||||
<entry><link linkend="threads.concepts.ScopedLock">ScopedLock</link></entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</informaltable>
|
||||
</para>
|
||||
|
||||
<para>The <classname>mutex</classname> class uses an
|
||||
<link linkend="threads.concepts.unspecified-locking-strategy">Unspecified</link>
|
||||
locking strategy, so attempts to recursively lock a <classname>mutex</classname>
|
||||
object or attempts to unlock one by threads that don't own a lock on it result in
|
||||
<emphasis role="bold">undefined behavior</emphasis>.
|
||||
This strategy allows implementations to be as efficient as possible
|
||||
on any given platform. It is, however, recommended that
|
||||
implementations include debugging support to detect misuse when
|
||||
<code>NDEBUG</code> is not defined.</para>
|
||||
|
||||
<para>Like all
|
||||
<link linkend="threads.concepts.mutex-models">mutex models</link>
|
||||
in &Boost.Threads;, <classname>mutex</classname> leaves the
|
||||
<link linkend="threads.concepts.sheduling-policies">scheduling policy</link>
|
||||
as <link linkend="threads.concepts.unspecified-scheduling-policy">Unspecified</link>.
|
||||
Programmers should make no assumptions about the order in which
|
||||
waiting threads acquire a lock.</para>
|
||||
</description>
|
||||
|
||||
<inherit access="private">
|
||||
<type><classname>boost::noncopyable</classname></type>
|
||||
<purpose>Exposition only</purpose>
|
||||
</inherit>
|
||||
|
||||
<typedef name="scoped_lock">
|
||||
<type><emphasis>implementation-defined</emphasis></type>
|
||||
</typedef>
|
||||
|
||||
<constructor>
|
||||
<effects>Constructs a <classname>mutex</classname> object.
|
||||
</effects>
|
||||
|
||||
<postconditions><code>*this</code> is in an unlocked state.
|
||||
</postconditions>
|
||||
</constructor>
|
||||
|
||||
<destructor>
|
||||
<effects>Destroys a <classname>mutex</classname> object.</effects>
|
||||
|
||||
<requires><code>*this</code> is in an unlocked state.</requires>
|
||||
|
||||
<notes><emphasis role="bold">Danger:</emphasis> Destruction of a
|
||||
locked mutex is a serious programming error resulting in undefined
|
||||
behavior such as a program crash.</notes>
|
||||
</destructor>
|
||||
</class>
|
||||
|
||||
<class name="try_mutex">
|
||||
<purpose>
|
||||
<para>The <classname>try_mutex</classname> class is a model of the
|
||||
<link linkend="threads.concepts.TryMutex">TryMutex</link> concept.</para>
|
||||
</purpose>
|
||||
|
||||
<description>
|
||||
<para>The <classname>try_mutex</classname> class is a model of the
|
||||
<link linkend="threads.concepts.TryMutex">TryMutex</link> concept.
|
||||
It should be used to synchronize access to shared resources using
|
||||
<link linkend="threads.concepts.unspecified-locking-strategy">Unspecified</link>
|
||||
locking mechanics.</para>
|
||||
|
||||
<para>For classes that model related mutex concepts, see
|
||||
<classname>mutex</classname> and <classname>timed_mutex</classname>.</para>
|
||||
|
||||
<para>For <link linkend="threads.concepts.recursive-locking-strategy">Recursive</link>
|
||||
locking mechanics, see <classname>recursive_mutex</classname>,
|
||||
<classname>recursive_try_mutex</classname>, and <classname>recursive_timed_mutex</classname>.
|
||||
</para>
|
||||
|
||||
<para>The <classname>try_mutex</classname> class supplies the following typedefs,
|
||||
which <link linkend="threads.concepts.lock-models">model</link>
|
||||
the specified locking strategies:
|
||||
|
||||
<informaltable>
|
||||
<tgroup cols="2" align="left">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Lock Name</entry>
|
||||
<entry>Lock Concept</entry>
|
||||
</row>
|
||||
</thead>
|
||||
<tbody>
|
||||
<row>
|
||||
<entry>scoped_lock</entry>
|
||||
<entry><link linkend="threads.concepts.ScopedLock">ScopedLock</link></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>scoped_try_lock</entry>
|
||||
<entry><link linkend="threads.concepts.ScopedTryLock">ScopedTryLock</link></entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</informaltable>
|
||||
</para>
|
||||
|
||||
<para>The <classname>try_mutex</classname> class uses an
|
||||
<link linkend="threads.concepts.unspecified-locking-strategy">Unspecified</link>
|
||||
locking strategy, so attempts to recursively lock a <classname>try_mutex</classname>
|
||||
object or attempts to unlock one by threads that don't own a lock on it result in
|
||||
<emphasis role="bold">undefined behavior</emphasis>.
|
||||
This strategy allows implementations to be as efficient as possible
|
||||
on any given platform. It is, however, recommended that
|
||||
implementations include debugging support to detect misuse when
|
||||
<code>NDEBUG</code> is not defined.</para>
|
||||
|
||||
<para>Like all
|
||||
<link linkend="threads.concepts.mutex-models">mutex models</link>
|
||||
in &Boost.Threads;, <classname>try_mutex</classname> leaves the
|
||||
<link linkend="threads.concepts.sheduling-policies">scheduling policy</link>
|
||||
as <link linkend="threads.concepts.unspecified-scheduling-policy">Unspecified</link>.
|
||||
Programmers should make no assumptions about the order in which
|
||||
waiting threads acquire a lock.</para>
|
||||
</description>
|
||||
|
||||
<inherit access="private">
|
||||
<type><classname>boost::noncopyable</classname></type>
|
||||
<purpose>Exposition only</purpose>
|
||||
</inherit>
|
||||
|
||||
<typedef name="scoped_lock">
|
||||
<type><emphasis>implementation-defined</emphasis></type>
|
||||
</typedef>
|
||||
|
||||
<typedef name="scoped_try_lock">
|
||||
<type><emphasis>implementation-defined</emphasis></type>
|
||||
</typedef>
|
||||
|
||||
<constructor>
|
||||
<effects>Constructs a <classname>try_mutex</classname> object.
|
||||
</effects>
|
||||
|
||||
<postconditions><code>*this</code> is in an unlocked state.
|
||||
</postconditions>
|
||||
</constructor>
|
||||
|
||||
<destructor>
|
||||
<effects>Destroys a <classname>try_mutex</classname> object.
|
||||
</effects>
|
||||
|
||||
<requires><code>*this</code> is in an unlocked state.</requires>
|
||||
|
||||
<notes><emphasis role="bold">Danger:</emphasis> Destruction of a
|
||||
locked mutex is a serious programming error resulting in undefined
|
||||
behavior such as a program crash.</notes>
|
||||
</destructor>
|
||||
</class>
|
||||
|
||||
<class name="timed_mutex">
|
||||
<purpose>
|
||||
<para>The <classname>timed_mutex</classname> class is a model of the
|
||||
<link linkend="threads.concepts.TimedMutex">TimedMutex</link> concept.</para>
|
||||
</purpose>
|
||||
|
||||
<description>
|
||||
<para>The <classname>timed_mutex</classname> class is a model of the
|
||||
<link linkend="threads.concepts.TimedMutex">TimedMutex</link> concept.
|
||||
It should be used to synchronize access to shared resources using
|
||||
<link linkend="threads.concepts.unspecified-locking-strategy">Unspecified</link>
|
||||
locking mechanics.</para>
|
||||
|
||||
<para>For classes that model related mutex concepts, see
|
||||
<classname>mutex</classname> and <classname>try_mutex</classname>.</para>
|
||||
|
||||
<para>For <link linkend="threads.concepts.recursive-locking-strategy">Recursive</link>
|
||||
locking mechanics, see <classname>recursive_mutex</classname>,
|
||||
<classname>recursive_try_mutex</classname>, and <classname>recursive_timed_mutex</classname>.
|
||||
</para>
|
||||
|
||||
<para>The <classname>timed_mutex</classname> class supplies the following typedefs,
|
||||
which <link linkend="threads.concepts.lock-models">model</link>
|
||||
the specified locking strategies:
|
||||
|
||||
<informaltable>
|
||||
<tgroup cols="2" align="left">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Lock Name</entry>
|
||||
<entry>Lock Concept</entry>
|
||||
</row>
|
||||
</thead>
|
||||
<tbody>
|
||||
<row>
|
||||
<entry>scoped_lock</entry>
|
||||
<entry><link linkend="threads.concepts.ScopedLock">ScopedLock</link></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>scoped_try_lock</entry>
|
||||
<entry><link linkend="threads.concepts.ScopedTryLock">ScopedTryLock</link></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>scoped_timed_lock</entry>
|
||||
<entry><link linkend="threads.concepts.ScopedTimedLock">ScopedTimedLock</link></entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</informaltable>
|
||||
</para>
|
||||
|
||||
<para>The <classname>timed_mutex</classname> class uses an
|
||||
<link linkend="threads.concepts.unspecified-locking-strategy">Unspecified</link>
|
||||
locking strategy, so attempts to recursively lock a <classname>timed_mutex</classname>
|
||||
object or attempts to unlock one by threads that don't own a lock on it result in
|
||||
<emphasis role="bold">undefined behavior</emphasis>.
|
||||
This strategy allows implementations to be as efficient as possible
|
||||
on any given platform. It is, however, recommended that
|
||||
implementations include debugging support to detect misuse when
|
||||
<code>NDEBUG</code> is not defined.</para>
|
||||
|
||||
<para>Like all
|
||||
<link linkend="threads.concepts.mutex-models">mutex models</link>
|
||||
in &Boost.Threads;, <classname>timed_mutex</classname> leaves the
|
||||
<link linkend="threads.concepts.sheduling-policies">scheduling policy</link>
|
||||
as <link linkend="threads.concepts.unspecified-scheduling-policy">Unspecified</link>.
|
||||
Programmers should make no assumptions about the order in which
|
||||
waiting threads acquire a lock.</para>
|
||||
</description>
|
||||
|
||||
<inherit access="private">
|
||||
<type><classname>boost::noncopyable</classname></type>
|
||||
<purpose>Exposition only</purpose>
|
||||
</inherit>
|
||||
|
||||
<typedef name="scoped_lock">
|
||||
<type><emphasis>implementation-defined</emphasis></type>
|
||||
</typedef>
|
||||
|
||||
<typedef name="scoped_try_lock">
|
||||
<type><emphasis>implementation-defined</emphasis></type>
|
||||
</typedef>
|
||||
|
||||
<typedef name="scoped_timed_lock">
|
||||
<type><emphasis>implementation-defined</emphasis></type>
|
||||
</typedef>
|
||||
|
||||
<constructor>
|
||||
<effects>Constructs a <classname>timed_mutex</classname> object.
|
||||
</effects>
|
||||
|
||||
<postconditions><code>*this</code> is in an unlocked state.
|
||||
</postconditions>
|
||||
</constructor>
|
||||
|
||||
<destructor>
|
||||
<effects>Destroys a <classname>timed_mutex</classname> object.</effects>
|
||||
|
||||
<requires><code>*this</code> is in an unlocked state.</requires>
|
||||
|
||||
<notes><emphasis role="bold">Danger:</emphasis> Destruction of a
|
||||
locked mutex is a serious programming error resulting in undefined
|
||||
behavior such as a program crash.</notes>
|
||||
</destructor>
|
||||
</class>
|
||||
</namespace>
|
||||
</header>
|
||||
243
doc/mutex.html
243
doc/mutex.html
@@ -1,243 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - Header <boost/thread/mutex.hpp></title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Header <<a href="../../../boost/thread/mutex.hpp">boost/thread/mutex.hpp</a>></h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<h2>Contents</h2>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#classes">Classes</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-mutex">Class <code>mutex</code></a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-mutex-synopsis">Class <code>mutex</code> synopsis</a></dt>
|
||||
<dt><a href="#class-mutex-ctors">Class <code>mutex</code> constructors and
|
||||
destructor</a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-try_mutex">Class <code>try_mutex</code></a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-try_mutex-synopsis">Class <code>try_mutex</code> synopsis</a></dt>
|
||||
<dt><a href="#class-try_mutex-ctors">Class <code>try_mutex</code> constructors
|
||||
and destructor</a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-timed_mutex">Class <code>timed_mutex</code></a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-timed_mutex-synopsis">Class <code>timed_mutex</code>
|
||||
synopsis</a></dt>
|
||||
<dt><a href="#class-timed_mutex-ctors">Class <code>timed_mutex</code> constructors
|
||||
and destructor</a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
<dt><a href="#examples">Example(s)</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p>Include the header <<a href="../../../boost/thread/mutex.hpp">boost/thread/mutex.hpp</a>>
|
||||
to define the <code><a href="#mutex Synopsis">mutex</a></code>, <code><a href=
|
||||
"#try_mutex Synopsis">try_mutex</a></code> and <code><a href=
|
||||
"#timed_mutex Synopsis">timed_mutex</a></code> classes.</p>
|
||||
<p>The <code><a href="#mutex Synopsis">mutex</a></code>, <code><a href=
|
||||
"#try_mutex Synopsis">try_mutex</a></code> and <code><a href=
|
||||
"#timed_mutex Synopsis">timed_mutex</a></code> classes are models of <a href="mutex_concept.html#Mutex-concept">Mutex</a>,
|
||||
<a href="mutex_concept.html#TryMutex-concept">TryMutex</a>, and <a href="mutex_concept.html#TimedMutex-concept">TimedMutex</a>
|
||||
respectively. These types should be used to non-recursively synchronize access
|
||||
to shared resources. For recursive locking mechanics, see the <a href="recursive_mutex.html">recursive
|
||||
mutexes</a> supplied by <b>Boost.Threads</b>.</p>
|
||||
<p>Each class supplies one or more typedefs for lock types which model matching
|
||||
lock concepts. For the best possible performance you should use the mutex class
|
||||
that supports the minimum set of lock types that you need.</p>
|
||||
<table summary="lock types" border="1" cellpadding="5">
|
||||
<tr>
|
||||
<td><b>Mutex Class</b></td>
|
||||
<td><b>Lock name</b></td>
|
||||
<td><b>Lock Concept</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><a href="#mutex Synopsis"><code> mutex</code></a></td>
|
||||
<td valign="middle"><code>scoped_lock</code></td>
|
||||
<td valign="middle"><a href="lock_concept.html#ScopedLock"> ScopedLock</a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code><a href="#try_mutex Synopsis"> try_mutex</a></code>
|
||||
</td>
|
||||
<td valign="middle"><code>scoped_lock<br>
|
||||
scoped_try_lock</code></td>
|
||||
<td valign="middle"><a href="lock_concept.html#ScopedLock"> ScopedLock</a><br>
|
||||
<a href="lock_concept.html#ScopedTryLock"> ScopedTryLock</a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code><a href="#timed_mutex Synopsis"> timed_mutex</a></code>
|
||||
</td>
|
||||
<td valign="middle"><code>scoped_lock<br>
|
||||
scoped_try_lock<br>
|
||||
scoped_timed_lock</code></td>
|
||||
<td valign="middle"><a href="lock_concept.html#ScopedLock"> ScopedLock</a><br>
|
||||
<a href="lock_concept.html#ScopedTryLock"> ScopedTryLock</a><br>
|
||||
<a href="lock_concept.html#ScopedTimedLock"> ScopedTimedLock</a></td>
|
||||
</tr>
|
||||
</table>
|
||||
<p>The <code>mutex</code>, <code>try_mutex</code> and <code>timed_mutex</code>
|
||||
classes use an <code>Unspecified</code> <a href="mutex_concept.html#LockingStrategies">locking
|
||||
strategy</a>, so attempts to recursively lock them or attempts to unlock them
|
||||
by threads that don't own a lock on them result in <b>undefined behavior</b>.
|
||||
This strategy allows implementations to be as efficient as possible on any given
|
||||
platform. It is, however, recommended that implementations include debugging
|
||||
support to detect misuse when <code>NDEBUG</code> is not defined.</p>
|
||||
<p>Like all the <b>Boost.Threads</b> <a href="mutex_concept.html">mutex models</a>,
|
||||
the <code>mutex</code>, <code>try_mutex</code> and <code> timed_mutex</code>
|
||||
leave the <a href="mutex_concept.html#SchedulingPolicies">scheduling policy</a>
|
||||
as <code> Unspecified</code>. Programmers should make no assumptions about the
|
||||
order in which waiting threads acquire a lock.</p>
|
||||
<h2><a name="classes"></a>Classes</h2>
|
||||
<h3><a name="class-mutex"></a>Class <code>mutex</code></h3>
|
||||
<p>The <code>mutex</code> class is a model of <a href="mutex_concept.html#Mutex-concept">Mutex</a>
|
||||
and <a href="overview.html#non-copyable">NonCopyable</a>, and provides no additional
|
||||
facilities beyond the requirements of these concepts.</p>
|
||||
<h4><a name="class-mutex-synopsis"></a>Class <code>mutex</code> synopsis</h4>
|
||||
<pre>
|
||||
namespace boost
|
||||
{
|
||||
class mutex : private <a href="../../utility/utility.htm">boost::noncopyable</a> // Exposition only.
|
||||
// Class mutex meets the <a href="overview.html#non-copyable">NonCopyable</a> requirement.
|
||||
{
|
||||
public:
|
||||
typedef <i>[implementation defined; see <a href="#Introduction">Introduction</a>]</i> scoped_lock;
|
||||
|
||||
mutex();
|
||||
~mutex();
|
||||
};
|
||||
};
|
||||
</pre>
|
||||
<h4><a name="class-mutex-ctors"></a>Class <code>mutex</code> constructors and
|
||||
destructor</h4>
|
||||
<pre>
|
||||
mutex();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Postconditions:</b> <code>*this</code> is in an unlocked state.</dt>
|
||||
</dl>
|
||||
<pre>
|
||||
~mutex();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>*this</code> is in an unlocked sate.</dt>
|
||||
<dt><b>Danger:</b> Destruction of a locked mutex is a serious programming error
|
||||
resulting in undefined behavior such as a program crash.</dt>
|
||||
</dl>
|
||||
<h3><a name="class-try_mutex"></a>Class <code>try_mutex</code></h3>
|
||||
<p>The <code>try_mutex</code> class is a model of <a href="mutex_concept.html#TryMutex-concept">TryMutex</a>
|
||||
and <a href="overview.html#non-copyable">NonCopyable</a>, and provides no additional
|
||||
facilities beyond the requirements of these concepts.</p>
|
||||
<h4><a name="class-try_mutex-synopsis"></a>Class <code>try_mutex</code> synopsis</h4>
|
||||
<pre>
|
||||
namespace boost
|
||||
{
|
||||
class try_mutex : private <a href="../../utility/utility.htm">boost::noncopyable</a> // Exposition only.
|
||||
// Class try_mutex meets the <a href="overview.html#non-copyable">NonCopyable</a> requirement.
|
||||
{
|
||||
Public:
|
||||
typedef <i>[implementation defined; see <a href="#Introduction">Introduction</a>]</i> scoped_lock;
|
||||
typedef <i>[implementation defined; see <a href="#Introduction">Introduction</a>]</i> scoped_try_lock;
|
||||
|
||||
try_mutex();
|
||||
~try_mutex();
|
||||
};
|
||||
};
|
||||
</pre>
|
||||
<h4><a name="class-try_mutex-ctors"></a>Class <code>try_mutex</code> constructors
|
||||
and destructor</h4>
|
||||
<pre>
|
||||
try_mutex();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Postconditions:</b> <code>*this</code> is in an unlocked state.</dt>
|
||||
</dl>
|
||||
<pre>
|
||||
~try_mutex();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>*this</code> is in an unlocked sate.</dt>
|
||||
<dt><b>Danger:</b> Destruction of a locked mutex is a serious programming error
|
||||
resulting in undefined behavior such as a program crash.</dt>
|
||||
</dl>
|
||||
<h3><a name="class-timed_mutex"></a>Class <code>timed_mutex</code></h3>
|
||||
<p>The <code>timed_mutex</code> class is a model of <a href="mutex_concept.html#TimedMutex-concept">TimedMutex</a>
|
||||
and <a href="overview.html#non-copyable">NonCopyable</a>, and provides no additional
|
||||
facilities beyond the requirements of these concepts.</p>
|
||||
<h4><a name="class-timed_mutex-synopsis"></a>Class <code>timed_mutex</code> synopsis</h4>
|
||||
<pre>
|
||||
namespace boost
|
||||
{
|
||||
class timed_mutex : private <a href="../../utility/utility.htm">boost::noncopyable</a> // Exposition only.
|
||||
// Class timed_mutex meets the <a href="overview.html#non-copyable">NonCopyable</a> requirement.
|
||||
{
|
||||
Public:
|
||||
typedef <i>[implementation defined; see <a href="#Introduction">Introduction</a>]</i> scoped_lock;
|
||||
typedef <i>[implementation defined; see <a href="#Introduction">Introduction</a>]</i> scoped_try_lock;
|
||||
typedef <i>[implementation defined; see <a href="#Introduction">Introduction</a>]</i> scoped_timed_lock;
|
||||
|
||||
timed_mutex();
|
||||
~timed_mutex();
|
||||
};
|
||||
};
|
||||
</pre>
|
||||
<h4><a name="class-timed_mutex-ctors"></a>Class <code>timed_mutex</code> constructors
|
||||
and destructor</h4>
|
||||
<pre>
|
||||
timed_mutex();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Postconditions:</b> <code>*this</code> is in an unlocked state.</dt>
|
||||
</dl>
|
||||
<pre>
|
||||
~timed_mutex();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>*this</code> is in an unlocked sate.</dt>
|
||||
<dt><b>Danger:</b> Destruction of a locked mutex is a serious programming error
|
||||
resulting in undefined behavior such as a program crash.</dt>
|
||||
</dl>
|
||||
<h2><a name="examples"></a>Example(s)</h2>
|
||||
<p><a href="../example/mutex.cpp">libs/thread/example/mutex.cpp</a></p>
|
||||
<p>The output is:</p>
|
||||
<pre>
|
||||
count == 1
|
||||
count == 2
|
||||
count == 3
|
||||
count == 4
|
||||
</pre>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2001
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
@@ -1,237 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - Mutex Concept</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300"> <a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Mutex Concept</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#locking-strategies">Locking Strategies</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#locking-strategy-recursive">Recursive</a></dt>
|
||||
<dt><a href="#locking-strategy-checked">Checked</a></dt>
|
||||
<dt><a href="#locking-strategy-unchecked">Unchecked</a></dt>
|
||||
<dt><a href="#locking-strategy-unspecified">Unspecified</a></dt>
|
||||
</dl>
|
||||
<dt><a href="#scheduling-policies">Scheduling Policies</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#scheduling-policy-FIFO">FIFO</a></dt>
|
||||
<dt><a href="#scheduling-policy-priority-driven">Priority Driven</a></dt>
|
||||
<dt><a href="#scheduling-policy-unspecified">Unspecified</a></dt>
|
||||
</dl>
|
||||
<dt><a href="#concept-requirements">Concept Requirements</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#Mutex-concept">Mutex Concept</a></dt>
|
||||
<dt><a href="#TryMutex-concept">TryMutex Concept</a></dt>
|
||||
<dt><a href="#TimedMutex-concept">TimedMutex Concept</a></dt>
|
||||
</dl>
|
||||
<dt><a href="#models">Models</a></dt>
|
||||
</dl>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p>A mutex (short for mutual-exclusion) object is used to serializes access to
|
||||
a resource shared between multiple threads. The <a href="#Mutex">Mutex</a> concept,
|
||||
with <a href="#TryMutex">TryMutex</a> and <a href="#TimedMutex">TimedMutex</a>
|
||||
refinements, formalize the requirements. A model that implements Mutex and its
|
||||
refinements has two states: <b>locked</b> and <b>unlocked</b>. Before using
|
||||
a shared resource, a thread locks a <b>Boost.Threads</b> mutex object (an object
|
||||
whose type is a model of <a href="#Mutex-concept">Mutex</a> or one of it's
|
||||
refinements), insuring <a href="definitions.html#thread-safe">thread-safe</a>
|
||||
access to the shared resource. When use of the shared resource is complete,
|
||||
the thread unlocks the mutex object, allowing another thread to acquire the
|
||||
lock and use the shared resource.</p>
|
||||
<p>Traditional C thread APIs, like POSIX threads or the Windows thread APIs, expose
|
||||
functions to lock and unlock a mutex object. This is dangerous since it's
|
||||
easy to forget to unlock a locked mutex. When the flow of control is complex,
|
||||
with multiple return points, the likelihood of forgetting to unlock a mutex
|
||||
object would become even greater. When exceptions are thrown, it becomes nearly
|
||||
impossible to ensure that the mutex object is unlocked properly when using these
|
||||
traditional API's. The result is <a href="definitions.html#deadlock">deadlock</a>.</p>
|
||||
<p>Many C++ threading libraries use a pattern known as <i>Scoped Locking</i> <a href="bibliography.html#Schmidt-00">[Schmidt
|
||||
00]</a> to free the programmer from the need to explicitly lock and unlock mutex
|
||||
objects. With this pattern, a <a href="lock_concept.html">Lock</a> concept is
|
||||
employed where the lock object's constructor locks the associated mutex
|
||||
object and the destructor automatically does the unlocking. The <b>Boost.Threads</b>
|
||||
library takes this pattern to the extreme in that Lock concepts are the only
|
||||
way to lock and unlock a mutex object: lock and unlock functions are not exposed
|
||||
by any <b>Boost.Threads</b> mutex objects. This helps to ensure safe usage patterns,
|
||||
especially when code throws exceptions.</p>
|
||||
<h2><a name="locking-strategies"></a>Locking Strategies</h2>
|
||||
<p>Every mutex object follows one of several locking strategies. These strategies
|
||||
define the semantics for the locking operation when the calling thread already
|
||||
owns a lock on the mutex object.</p>
|
||||
<h3><a name="locking-strategy-recursive"></a>Recursive</h3>
|
||||
<p>With a recursive locking strategy when a thread attempts to acquire a lock
|
||||
on the mutex object for which it already owns a lock, the operation is successful.
|
||||
Note the distinction between a thread, which may have multiple locks outstanding
|
||||
on a recursive mutex object, and a lock object, which even for a recursive mutex
|
||||
object cannot have any of its lock functions called multiple times without first
|
||||
calling unlock.</p>
|
||||
<p>Internally a lock count is maintained and the owning thread must unlock the
|
||||
mutex model the same number of times that it's locked it before the mutex
|
||||
object's state returns to unlocked. Since mutex objects in <b>Boost.Threads</b>
|
||||
expose locking functionality only through lock concepts, a thread will always
|
||||
unlock a mutex object the same number of times that it locked it. This helps
|
||||
to eliminate a whole set of errors typically found in traditional C style thread
|
||||
APIs.</p>
|
||||
<p>Classes <a href="recursive_mutex.html#class-recursive_mutex">recursive_mutex</a>,
|
||||
<a href="recursive_mutex.html#class-recursive_try_mutex">recursive_try_mutex</a>
|
||||
and <a href="recursive_mutex.html#class-recursive_timed_mutex">recursive_timed_mutex</a>
|
||||
use this locking strategy.</p>
|
||||
<h3><a name="locking-strategy-checked"></a>Checked</h3>
|
||||
<p>With a checked locking strategy when a thread attempts to acquire a lock on
|
||||
the mutex object for which the thread already owns a lock, the operation will
|
||||
fail with some sort of error indication. Further, attempts by a thread to unlock
|
||||
a mutex object that was not locked by the thread will also return some sort
|
||||
of error indication. In <b>Boost.Threads</b>, an exception of type <a href="exceptions.html#class-lock_error">
|
||||
lock_error</a> would be thrown in these cases.</p>
|
||||
<p><b>Boost.Threads</b> does not currently provide any mutex objects that use
|
||||
this strategy.</p>
|
||||
<h3><a name="locking-strategy-unchecked"></a>Unchecked</h3>
|
||||
<p>With an unchecked locking strategy when a thread attempts to acquire a lock
|
||||
on a mutex object for which the thread already owns a lock the operation will
|
||||
<a href="definitions.html#definition-deadlock">deadlock</a>. In general this
|
||||
locking strategy is less safe than a checked or recursive strategy, but it's
|
||||
also a faster strategy and so is employed by many libraries.</p>
|
||||
<p><b>Boost.Threads</b> does not currently provide any mutex objects that use
|
||||
this strategy.</p>
|
||||
<h3><a name="locking-strategy-unspecified"></a>Unspecified</h3>
|
||||
<p>With an unspecified locking strategy, when a thread attempts to acquire a lock
|
||||
on a mutex object for which the thread already owns a lock the operation results
|
||||
in <b>undefined behavior</b>.</p>
|
||||
<p>In general a mutex object with an unspecified locking strategy is unsafe, and
|
||||
it requires programmer discipline to use the mutex object properly. However,
|
||||
this strategy allows an implementation to be as fast as possible with no restrictions
|
||||
on its implementation. This is especially true for portable implementations
|
||||
that wrap the native threading support of a platform. For this reason, the classes
|
||||
<a href="mutex.html#class-mutex">mutex</a>, <a href="mutex.html#class-try_mutex">try_mutex</a>
|
||||
and <a href="mutex.html#class-timed_mutex">timed_mutex</a> use this locking
|
||||
strategy despite the lack of safety.</p>
|
||||
<h2><a name="scheduling-policies"></a>Scheduling Policies</h2>
|
||||
<p>Every mutex object follows one of several scheduling policies. These policies
|
||||
define the semantics when the mutex object is unlocked and there is more than
|
||||
one thread waiting to acquire a lock. In other words, the policy defines which
|
||||
waiting thread shall acquire the lock.</p>
|
||||
<h3><a name="scheduling-policy-FIFO"></a>FIFO</h3>
|
||||
<p>With a FIFO scheduling policy, threads waiting for the lock will acquire it
|
||||
in a first come first serve order (or First In First Out). This can help prevent
|
||||
a high priority thread from starving lower priority threads that are also waiting
|
||||
on the mutex object's lock.</p>
|
||||
<h3><a name="scheduling-policy-priority-driven"></a>Priority Driven</h3>
|
||||
<p>With a Priority Driven scheduling policy, the thread with the highest priority
|
||||
acquires the lock. Note that this means that low-priority threads may never
|
||||
acquire the lock if the mutex object has high contention and there is always
|
||||
at least one high-priority thread waiting. This is known as thread starvation.
|
||||
When multiple threads of the same priority are waiting on the mutex object's
|
||||
lock one of the other scheduling priorities will determine which thread shall
|
||||
acquire the lock.</p>
|
||||
<h3><a name="scheduling-policy-unspecified"></a>Unspecified</h3>
|
||||
<p>The mutex object does not specify a scheduling policy. In order to ensure portability,
|
||||
all <b>Boost.Threads</b> mutex models use an unspecified scheduling policy.</p>
|
||||
<h2><a name="concept-requirements"></a>Concept Requirements</h2>
|
||||
<h3><a name="Mutex-concept"></a>Mutex Concept</h3>
|
||||
<p>A Mutex object has two states: locked and unlocked. Mutex object state can
|
||||
only be determined by an object meeting the <a href="lock_concept.html#ScopedLock">ScopedLock</a>
|
||||
requirements and constructed for the Mutex object.</p>
|
||||
<p>A Mutex is <a href="../../utility/utility.htm#Class_noncopyable">NonCopyable</a>.</p>
|
||||
<p>For a Mutex type M and an object m of that type, the following expressions
|
||||
must be well-formed and have the indicated effects.</p>
|
||||
<table summary="Mutex expressions" border="1" cellpadding="5">
|
||||
<tr>
|
||||
<td><b>Expression</b></td>
|
||||
<td><b>Effects</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><code>M m;</code></td>
|
||||
<td>Constructs a mutex object m. Post-condition: m is unlocked.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><code>(&m)->~M();</code></td>
|
||||
<td>Precondition: m is unlocked. Destroys a mutex object m.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><code>M::scoped_lock</code></td>
|
||||
<td>A model of <a href="lock_concept.html#ScopedLock">ScopedLock</a>.</td>
|
||||
</tr>
|
||||
</table>
|
||||
<h3><a name="TryMutex-concept"></a>TryMutex Concept</h3>
|
||||
<p>A TryMutex is a refinement of <a href="#Mutex-concept">Mutex</a>. For a TryMutex
|
||||
type M and an object m of that type, the following expressions must be well-formed
|
||||
and have the indicated effects.</p>
|
||||
<table summary="TryMutex expressions" border="1" cellpadding="5">
|
||||
<tr>
|
||||
<td><b>Expression</b></td>
|
||||
<td><b>Effects</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><code>M::scoped_try_lock</code></td>
|
||||
<td>A model of <a href="lock_concept.html#ScopedTryLock">ScopedTryLock</a>.</td>
|
||||
</tr>
|
||||
</table>
|
||||
<h3><a name="TimedMutex-concept"></a>TimedMutex Concept</h3>
|
||||
<p>A TimedMutex is a refinement of <a href="#TryMutex-concept">TryMutex</a>. For
|
||||
a TimedMutex type M and an object m of that type, the following expressions
|
||||
must be well-formed and have the indicated effects.</p>
|
||||
<table summary="TimedMutex expressions" border="1" cellpadding="5">
|
||||
<tr>
|
||||
<td><b>Expression</b></td>
|
||||
<td><b>Effects</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><code>M::scoped_timed_lock</code></td>
|
||||
<td>A model of <a href="lock_concept.html#ScopedTimedLock">ScopedTimedLock</a>.</td>
|
||||
</tr>
|
||||
</table>
|
||||
<h2><a name="models"></a>Models</h2>
|
||||
<p><b>Boost.Threads</b> currently supplies six models of Mutex.</p>
|
||||
<table summary="Mutex concept classes" border="1" cellpadding="5">
|
||||
<tr>
|
||||
<td><b>Concept</b></td>
|
||||
<td><b>Refines</b></td>
|
||||
<td><b>Models</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><a href="#Mutex-concept">Mutex</a></td>
|
||||
<td valign="top"> </td>
|
||||
<td><a href="mutex.html">mutex</a><br>
|
||||
<a href="recursive_mutex.html">recursive_mutex</a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><a href="#TryMutex-concept">TryMutex</a></td>
|
||||
<td valign="top"><a href="#Mutex-concept">Mutex</a></td>
|
||||
<td><a href="mutex.html">try_mutex<br>
|
||||
</a> <a href="recursive_mutex.html">recursive_try_mutex</a> </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><a href="#TimedMutex-concept">TimedMutex</a></td>
|
||||
<td valign="top"><a href="#TryMutex-concept">TryMutex</a></td>
|
||||
<td><a href="mutex.html">timed_mutex<br>
|
||||
</a> <a href="recursive_mutex.html"> recursive_timed_mutex</a></td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->09 January, 2003<!--webbot bot="Timestamp" endspan i-checksum="38582" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
86
doc/once-ref.xml
Normal file
86
doc/once-ref.xml
Normal file
@@ -0,0 +1,86 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<header name="boost/thread/once.hpp"
|
||||
last-revision="$Date$">
|
||||
<macro name="BOOST_ONCE_INIT">
|
||||
<purpose>The <functionname>call_once</functionname> function and
|
||||
<code>once_flag</code> type (statically initialized to
|
||||
<macroname>BOOST_ONCE_INIT</macroname>) can be used to run a
|
||||
routine exactly once. This can be used to initialize data in a
|
||||
<link linkend="threads.glossary.thread-safe">thread-safe</link>
|
||||
manner.</purpose>
|
||||
|
||||
<description>The implementation-defined macro
|
||||
<macroname>BOOST_ONCE_INIT</macroname> is a constant value used to
|
||||
initialize <code>once_flag</code> instances to indicate that the
|
||||
logically associated routine has not been run yet. See
|
||||
<functionname>call_once</functionname> for more details.</description>
|
||||
</macro>
|
||||
|
||||
<namespace name="boost">
|
||||
<typedef name="once_flag">
|
||||
<purpose>The <functionname>call_once</functionname> function and
|
||||
<code>once_flag</code> type (statically initialized to
|
||||
<macroname>BOOST_ONCE_INIT</macroname>) can be used to run a
|
||||
routine exactly once. This can be used to initialize data in a
|
||||
<link linkend="threads.glossary.thread-safe">thread-safe</link>
|
||||
manner.</purpose>
|
||||
|
||||
<description>The implementation-defined type <code>once_flag</code>
|
||||
is used as a flag to insure a routine is called only once.
|
||||
Instances of this type should be statically initialized to
|
||||
<macroname>BOOST_ONCE_INIT</macroname>. See
|
||||
<functionname>call_once</functionname> for more details.
|
||||
</description>
|
||||
|
||||
<type><emphasis>implementation-defined</emphasis></type>
|
||||
</typedef>
|
||||
|
||||
<function name="call_once">
|
||||
<purpose>The <functionname>call_once</functionname> function and
|
||||
<code>once_flag</code> type (statically initialized to
|
||||
<macroname>BOOST_ONCE_INIT</macroname>) can be used to run a
|
||||
routine exactly once. This can be used to initialize data in a
|
||||
<link linkend="threads.glossary.thread-safe">thread-safe</link>
|
||||
manner.</purpose>
|
||||
|
||||
<description>
|
||||
<para>Example usage is as follows:</para>
|
||||
<para>
|
||||
<programlisting>//Example usage:
|
||||
boost::once_flag once = BOOST_ONCE_INIT;
|
||||
|
||||
void init()
|
||||
{
|
||||
//...
|
||||
}
|
||||
|
||||
void thread_proc()
|
||||
{
|
||||
boost::call_once(&init, once);
|
||||
}</programlisting>
|
||||
</para></description>
|
||||
|
||||
<parameter name="func">
|
||||
<paramtype>void (*func)()</paramtype>
|
||||
</parameter>
|
||||
|
||||
<parameter name="flag">
|
||||
<paramtype>once_flag&</paramtype>
|
||||
</parameter>
|
||||
|
||||
<requires>The function <code>func</code> shall not throw
|
||||
exceptions.</requires>
|
||||
|
||||
<effects>As if (in an atomic fashion):
|
||||
<code>if (flag == BOOST_ONCE_INIT) func();</code></effects>
|
||||
|
||||
<postconditions><code>flag != BOOST_ONCE_INIT</code>
|
||||
</postconditions>
|
||||
</function>
|
||||
</namespace>
|
||||
</header>
|
||||
@@ -1,90 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - Header <boost/thread/once.hpp></title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Header <<a href="../../../boost/thread/once.hpp">boost/thread/once.hpp</a>></h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<h2>Contents</h2>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#macros">Macros</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#macro-BOOST_ONCE_INIT">BOOST_ONCE_INIT</a></dt>
|
||||
</dl>
|
||||
<dt><a href="#types">Types</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#type-once_flag">once_flag</a></dt>
|
||||
</dl>
|
||||
<dt><a href="#functions">Functions</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#function-call_once">call_once</a></dt>
|
||||
</dl>
|
||||
<dt><a href="#examples">Example(s)</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p>Include the header <<a href="../../../boost/thread/once.hpp">boost/thread/once.hpp</a>>
|
||||
to define the <code>call_once</code> function, <code>once_flag</code> type and
|
||||
<code>BOOST_ONCE_INIT</code> constant.</p>
|
||||
<p>The <code>call_once</code> function and <code>once_flag</code> type (statically
|
||||
initialized to <code>BOOST_ONCE_INIT</code>) can be used to run a routine exactly
|
||||
once. This can be used to initialize data in a <a href="definitions.html#Thread-safe">
|
||||
thread-safe</a> manner.</p>
|
||||
<h2><a name="macros"></a>Macros</h2>
|
||||
<pre>
|
||||
<a name="macro-BOOST_ONCE_INIT"></a>#define BOOST_ONCE_INIT <i>implementation defined</i>
|
||||
</pre>
|
||||
<p>This is a constant value used to initialize <code>once_flag</code> instances
|
||||
to indicate that the logically associated routine has not been run yet.</p>
|
||||
<h2><a name="types"></a>Types</h2>
|
||||
<pre>
|
||||
<a name="type-once_flag"></a>typedef <i>implementation defined</i> once_flag;
|
||||
</pre>
|
||||
<p>This implementation defined type is used as a flag to insure a routine is called
|
||||
only once. Instances of this type should be statically initialized to <code>BOOST_ONCE_INIT</code>.</p>
|
||||
<h2><a name="functions"></a>Functions</h2>
|
||||
<pre>
|
||||
<a name="function-call_once"></a>void call_once(void (*func)(), once_flag& flag);
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> The function <code>func</code> shall not throw exceptions.</dt>
|
||||
<dt><b>Effects:</b> As if (in an atomic fashion):
|
||||
<pre>
|
||||
if (flag == BOOST_ONCE_INIT)
|
||||
func();
|
||||
</pre>
|
||||
</dt>
|
||||
<dt><b>Postconditions:</b> <code>flag != BOOST_ONCE_INIT</code></dt>
|
||||
</dl>
|
||||
<h2><a name="examples"></a>Example(s)</h2>
|
||||
<p><a href="../example/once.cpp">libs/thread/example/once.cpp</a></p>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2001
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
@@ -1,172 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - Overview</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Overview</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<dl class="index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#dangers">Dangers</a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="#testing-debugging">Testing and debugging considerations</a></dt>
|
||||
<dt><a href="#head-start">Getting a head start</a></dt>
|
||||
</dl>
|
||||
<dt><a href="#library">C++ Standard Library usage in multithreaded programs</a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="#runtime-libraries">Runtime libraries</a></dt>
|
||||
<dt><a href="#non-thread-safe-functions">Potentially non-thread-safe functions</a></dt>
|
||||
</dl>
|
||||
<dt><a href="#common-requirements">Common requirements for all Boost.Threads
|
||||
components</a></dt>
|
||||
<dl class="index">
|
||||
<dt><a href="#exceptions">Exceptions</a></dt>
|
||||
<dt><a href="#non-copyable">NonCopyable requirement</a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p>Boost.Threads allows C++ programs to execute as multiple, asynchronous, independent,
|
||||
threads-of-execution. Each thread has its own machine state including program
|
||||
instruction counter and registers. Programs which execute as multiple threads
|
||||
are called multithreaded programs to distinguish them from traditional single-threaded
|
||||
programs. <a href="definitions.html">Definitions</a> gives a more complete description
|
||||
of the multithreading execution environment.</p>
|
||||
<p>Multithreading provides several advantages:</p>
|
||||
<ul>
|
||||
<li>Programs which would otherwise block waiting for some external event can
|
||||
continue to respond if the blocking operation is placed in a separate thread.
|
||||
Multithreading is usually an absolute requirement for these programs.</li>
|
||||
</ul>
|
||||
<ul>
|
||||
<li>Well-designed multithreaded programs may execute faster than single-threaded
|
||||
programs, particularly on multiprocessor hardware. Note, however, that poorly-designed
|
||||
multithreaded programs are often slower that single-threaded programs.</li>
|
||||
</ul>
|
||||
<ul>
|
||||
<li>Some program designs may be easier to formulate using a multithreaded approach.
|
||||
After all, the real world is asynchronous!</li>
|
||||
</ul>
|
||||
<h2><a name="dangers"></a>Dangers</h2>
|
||||
<p>Beyond the errors which can occur in single-threaded programs, multithreaded
|
||||
programs are subject to additional errors:</p>
|
||||
<ul>
|
||||
<li><a href="definitions.html#definition-race-condition">Race conditions</a>.</li>
|
||||
<li><a href="definitions.html#definition-deadlock">Deadlock</a> (sometimes called
|
||||
"deadly embrace")</li>
|
||||
<li><a href="definitions.html#definition-priority-failure">Priority failures</a>
|
||||
(priority inversion, infinite overtaking, starvation, etc.)</li>
|
||||
</ul>
|
||||
<p>Every multithreaded program must be designed carefully to avoid race conditions,
|
||||
priority failures and deadlock. These aren't rare or exotic failures - they
|
||||
are virtually guaranteed to occur unless multithreaded code is designed to avoid
|
||||
them. Priority failures are somewhat less common, but are nonetheless serious.</p>
|
||||
<p>The <a href="introduction.html">Boost.Threads design</a> attempts to minimize
|
||||
these errors, but they will still occur unless the programmer proactively designs
|
||||
to avoid them.</p>
|
||||
<h3><a name="testing-debugging"></a>Testing and debugging considerations</h3>
|
||||
<p>Multithreaded programs are non-deterministic. In other words, the same program
|
||||
with the same input data may follow different execution paths each time it is
|
||||
invoked. That can make testing and debugging a nightmare:</p>
|
||||
<ul>
|
||||
<li>Failures are often not repeatable.</li>
|
||||
<li>Probe effect causes debuggers to produce very different results from non-debug
|
||||
uses.</li>
|
||||
<li>Debuggers require special support to show thread state.</li>
|
||||
<li>Tests on a single processor system may give no indication of serious errors
|
||||
which would appear on multiprocessor systems, and visa versa. Thus test cases
|
||||
should include a varying number of processors.</li>
|
||||
<li>For programs which create a varying number of threads according to workload,
|
||||
tests which don't span the full range of possibilities may miss serious
|
||||
errors.</li>
|
||||
</ul>
|
||||
<h3><a name="head-start"></a>Getting a head start</h3>
|
||||
<p>Although it might appear that multithreaded programs are inherently unreliable,
|
||||
many reliable multithreaded programs do exist. Multithreading techniques are
|
||||
known which lead to reliable programs.</p>
|
||||
<p>Design patterns for reliable multithreaded programs, including the important
|
||||
<i>monitor</i> pattern, are presented in <cite> Pattern-Oriented Software Architecture
|
||||
Volume 2 - Patterns for Concurrent and Networked Objects</cite> [<a href=
|
||||
"bibliography.html#Schmidt-00">Schmidt 00</a>]. Many important multithreading
|
||||
programming considerations (independent of threading library) are discussed
|
||||
in <cite>Programming with POSIX Threads</cite> [<a href="bibliography.html#Butenhof-97">Butenhof
|
||||
97</a>].</p>
|
||||
<p>Doing some reading before attempting multithreaded designs will give you a
|
||||
head start toward reliable multithreaded programs.</p>
|
||||
<h2><a name="library"></a>C++ Standard Library usage in multithreaded programs</h2>
|
||||
<h3><a name="runtime-libraries"></a>Runtime libraries</h3>
|
||||
<p><b>Warning:</b> Multithreaded programs such as those using <b> Boost.Threads</b>
|
||||
must link to <a href="definitions.html#Thread-safe"> thread-safe</a> versions
|
||||
of all runtime libraries used by the program, including the runtime library
|
||||
for the C++ Standard Library. Otherwise
|
||||
<a href="definitions.html#definition-race-condition">race
|
||||
conditions</a> will occur when multiple threads simultaneously execute runtime
|
||||
library functions for <i>new</i>, <i>delete</i>, or other language features
|
||||
which imply shared state.</p>
|
||||
<h3><a name="non-thread-safe-functions"></a>Potentially non-thread-safe functions</h3>
|
||||
<p>Certain C++ Standard Library functions inherited from C are particular problems
|
||||
because they hold internal state between calls:</p>
|
||||
<ul>
|
||||
<li>rand</li>
|
||||
<li>strtok</li>
|
||||
<li>asctime</li>
|
||||
<li>ctime</li>
|
||||
<li>gmtime</li>
|
||||
<li>localtime</li>
|
||||
</ul>
|
||||
<p>It is possible to write thread-safe implementations of these by using <a href="tss.html#class-thread_specific_ptr">thread-specific
|
||||
storage</a>, and several C++ compiler vendors do just that. The technique is
|
||||
well-know and is explained in [<a href=
|
||||
"bibliography.html#Butenhof-97">Buttenhof 97</a>].</p>
|
||||
<p>But at least one vendor (HP-UX) does not provide thread-safe implementations
|
||||
of the above functions in their otherwise thread-safe runtime library. Instead
|
||||
they provide replacement functions with different names and arguments.</p>
|
||||
<p><b>Recommendation:</b> For the most portable, yet thread-safe code, use Boost
|
||||
replacements for the problem functions. See the <a href=
|
||||
"../../random/index.html">Boost Random Number Library</a> and <a href=
|
||||
"../../tokenizer/index.htm">Boost Tokenizer Library</a>.</p>
|
||||
<h2><a name="common-gaurantees"></a>Common guarantees for all Boost.Threads components</h2>
|
||||
<h3><a name="exceptions"></a>Exceptions</h3>
|
||||
<p><b>Boost.Threads</b> destructors never throw exceptions. Unless otherwise specified,
|
||||
other <b>Boost.Threads</b> functions that do not have an exception-specification
|
||||
may throw implementation-defined exceptions.</p>
|
||||
<p>In particular, <b>Boost.Threads</b> reports failure to allocate storage by
|
||||
throwing an exception of type std::bad_alloc, or a class derived from std::bad_alloc,
|
||||
failure to obtain thread resources other than memory by throwing an exception
|
||||
of type <a href="exceptions.html#class-thread_resource_error">boost::thread_resource_error</a>,
|
||||
and certain lock related failures by throwing an exception of type <a href="exceptions.html#class-lock_error">boost::lock_error</a></p>
|
||||
<p><b>Rationale:</b> Follows the C++ Standard Library practice of allowing all
|
||||
functions except destructors or other specified functions to throw exceptions
|
||||
on errors.</p>
|
||||
<h3><a name="non-copyable"></a>NonCopyable requirement</h3>
|
||||
<p><b>Boost.Threads</b> classes documented as meeting the NonCopyable requirement
|
||||
disallow copy construction and copy assignment. For the sake of exposition,
|
||||
the synopsis of such classes show private derivation from <a href="../../utility/utility.htm">
|
||||
boost::noncopyable</a>. Users should not depend on this derivation, however,
|
||||
as implementations are free to meet the NonCopyable requirement in other ways.</p>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->09 January, 2003<!--webbot bot="Timestamp" endspan i-checksum="38582" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
202
doc/overview.xml
Normal file
202
doc/overview.xml
Normal file
@@ -0,0 +1,202 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<section id="threads.overview" last-revision="$Date$">
|
||||
<title>Overview</title>
|
||||
<section id="threads.introduction">
|
||||
<title>Introduction</title>
|
||||
<para>&Boost.Threads; allows C++ programs to execute as multiple,
|
||||
asynchronous, independent threads-of-execution. Each thread has its own
|
||||
machine state including program instruction counter and registers. Programs
|
||||
which execute as multiple threads are called multithreaded programs to
|
||||
distinguish them from traditional single-threaded programs. The <link
|
||||
linkend="threads.glossary">glossary</link> gives a more complete description
|
||||
of the multithreading execution environment.</para>
|
||||
<para>Multithreading provides several advantages:
|
||||
<itemizedlist>
|
||||
<listitem>
|
||||
<para>Programs which would otherwise block waiting for some external
|
||||
event can continue to respond if the blocking operation is placed in a
|
||||
separate thread. Multithreading is usually an absolute requirement for
|
||||
these programs.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Well-designed multithreaded programs may execute faster than
|
||||
single-threaded programs, particularly on multiprocessor hardware.
|
||||
Note, however, that poorly-designed multithreaded programs are often
|
||||
slower than single-threaded programs.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Some program designs may be easier to formulate using a
|
||||
multithreaded approach. After all, the real world is
|
||||
asynchronous!</para>
|
||||
</listitem>
|
||||
</itemizedlist></para>
|
||||
</section>
|
||||
<section>
|
||||
<title>Dangers</title>
|
||||
<section>
|
||||
<title>General considerations</title>
|
||||
<para>Beyond the errors which can occur in single-threaded programs,
|
||||
multithreaded programs are subject to additional errors:
|
||||
<itemizedlist>
|
||||
<listitem>
|
||||
<para><link linkend="threads.glossary.race-condition">Race
|
||||
conditions</link></para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><link linkend="threads.glossary.deadlock">Deadlock</link>
|
||||
(sometimes called "deadly embrace")</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><link linkend="threads.glossary.priority-failure">Priority
|
||||
failures</link> (priority inversion, infinite overtaking, starvation,
|
||||
etc.)</para>
|
||||
</listitem>
|
||||
</itemizedlist></para>
|
||||
<para>Every multithreaded program must be designed carefully to avoid these
|
||||
errors. These aren't rare or exotic failures - they are virtually guaranteed
|
||||
to occur unless multithreaded code is designed to avoid them. Priority
|
||||
failures are somewhat less common, but are nonetheless serious.</para>
|
||||
<para>The <link linkend="threads.design">&Boost.Threads; design</link>
|
||||
attempts to minimize these errors, but they will still occur unless the
|
||||
programmer proactively designs to avoid them.</para>
|
||||
<note>Please also see <xref linkend="threads.implementation_notes"/>
|
||||
for additional, implementation-specific considerations.</note>
|
||||
</section>
|
||||
<section>
|
||||
<title>Testing and debugging considerations</title>
|
||||
<para>Multithreaded programs are non-deterministic. In other words, the
|
||||
same program with the same input data may follow different execution
|
||||
paths each time it is invoked. That can make testing and debugging a
|
||||
nightmare:
|
||||
<itemizedlist>
|
||||
<listitem>
|
||||
<para>Failures are often not repeatable.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Probe effect causes debuggers to produce very different results
|
||||
from non-debug uses.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Debuggers require special support to show thread state.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Tests on a single processor system may give no indication of
|
||||
serious errors which would appear on multiprocessor systems, and visa
|
||||
versa. Thus test cases should include a varying number of
|
||||
processors.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>For programs which create a varying number of threads according
|
||||
to workload, tests which don't span the full range of possibilities
|
||||
may miss serious errors.</para>
|
||||
</listitem>
|
||||
</itemizedlist></para>
|
||||
</section>
|
||||
<section>
|
||||
<title>Getting a head start</title>
|
||||
<para>Although it might appear that multithreaded programs are inherently
|
||||
unreliable, many reliable multithreaded programs do exist. Multithreading
|
||||
techniques are known which lead to reliable programs.</para>
|
||||
<para>Design patterns for reliable multithreaded programs, including the
|
||||
important <emphasis>monitor</emphasis> pattern, are presented in
|
||||
<emphasis>Pattern-Oriented Software Architecture Volume 2 - Patterns for
|
||||
Concurrent and Networked Objects</emphasis>
|
||||
&cite.SchmidtStalRohnertBuschmann;. Many important multithreading programming
|
||||
considerations (independent of threading library) are discussed in
|
||||
<emphasis>Programming with POSIX Threads</emphasis> &cite.Butenhof97;.</para>
|
||||
<para>Doing some reading before attempting multithreaded designs will
|
||||
give you a head start toward reliable multithreaded programs.</para>
|
||||
</section>
|
||||
</section>
|
||||
<section>
|
||||
<title>C++ Standard Library usage in multithreaded programs</title>
|
||||
<section>
|
||||
<title>Runtime libraries</title>
|
||||
<para>
|
||||
<emphasis role="bold">Warning:</emphasis> Multithreaded programs such as
|
||||
those using &Boost.Threads; must link to <link
|
||||
linkend="threads.glossary.thread-safe">thread-safe</link> versions of
|
||||
all runtime libraries used by the program, including the runtime library
|
||||
for the C++ Standard Library. Failure to do so will cause <link
|
||||
linkend="threads.glossary.race-condition">race conditions</link> to occur
|
||||
when multiple threads simultaneously execute runtime library functions for
|
||||
<code>new</code>, <code>delete</code>, or other language features which
|
||||
imply shared state.</para>
|
||||
</section>
|
||||
<section>
|
||||
<title>Potentially non-thread-safe functions</title>
|
||||
<para>Certain C++ Standard Library functions inherited from C are
|
||||
particular problems because they hold internal state between
|
||||
calls:
|
||||
<itemizedlist>
|
||||
<listitem>
|
||||
<para><code>rand</code></para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><code>strtok</code></para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><code>asctime</code></para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><code>ctime</code></para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><code>gmtime</code></para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><code>localtime</code></para>
|
||||
</listitem>
|
||||
</itemizedlist></para>
|
||||
<para>It is possible to write thread-safe implementations of these by
|
||||
using thread specific storage (see
|
||||
<classname>boost::thread_specific_ptr</classname>), and several C++
|
||||
compiler vendors do just that. The technique is well-know and is explained
|
||||
in &cite.Butenhof97;.</para>
|
||||
<para>But at least one vendor (HP-UX) does not provide thread-safe
|
||||
implementations of the above functions in their otherwise thread-safe
|
||||
runtime library. Instead they provide replacement functions with
|
||||
different names and arguments.</para>
|
||||
<para><emphasis role="bold">Recommendation:</emphasis> For the most
|
||||
portable, yet thread-safe code, use Boost replacements for the problem
|
||||
functions. See the <libraryname>Boost Random Number Library</libraryname>
|
||||
and <libraryname>Boost Tokenizer Library</libraryname>.</para>
|
||||
</section>
|
||||
</section>
|
||||
<section>
|
||||
<title>Common guarantees for all &Boost.Threads; components</title>
|
||||
<section>
|
||||
<title>Exceptions</title>
|
||||
<para>&Boost.Threads; destructors never
|
||||
throw exceptions. Unless otherwise specified, other
|
||||
&Boost.Threads; functions that do not have
|
||||
an exception-specification may throw implementation-defined
|
||||
exceptions.</para>
|
||||
<para>In particular, &Boost.Threads;
|
||||
reports failure to allocate storage by throwing an exception of type
|
||||
<code>std::bad_alloc</code> or a class derived from
|
||||
<code>std::bad_alloc</code>, failure to obtain thread resources other than
|
||||
memory by throwing an exception of type
|
||||
<classname>boost::thread_resource_error</classname>, and certain lock
|
||||
related failures by throwing an exception of type
|
||||
<classname>boost::lock_error</classname>.</para>
|
||||
<para><emphasis role="bold">Rationale:</emphasis> Follows the C++ Standard
|
||||
Library practice of allowing all functions except destructors or other
|
||||
specified functions to throw exceptions on errors.</para>
|
||||
</section>
|
||||
<section>
|
||||
<title>NonCopyable requirement</title>
|
||||
<para>&Boost.Threads; classes documented as
|
||||
meeting the NonCopyable requirement disallow copy construction and copy
|
||||
assignment. For the sake of exposition, the synopsis of such classes show
|
||||
private derivation from <classname>boost::noncopyable</classname>. Users
|
||||
should not depend on this derivation, however, as implementations are free
|
||||
to meet the NonCopyable requirement in other ways.</para>
|
||||
</section>
|
||||
</section>
|
||||
</section>
|
||||
@@ -1,383 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - Rationale</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Rationale</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<dl class="index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#library">Rationale for the Creation of <b>Boost.Threads</b></a></dt>
|
||||
<dt><a href="#primitives">Rationale for the Low Level Primitives Supported in
|
||||
<b>Boost.Threads</b></a></dt>
|
||||
<dt><a href="#lock_objects">Rationale for the Lock Design</a></dt>
|
||||
<dt><a href="#non-copyable">Rationale for NonCopyable Thread Type</a></dt>
|
||||
<dt><a href="#events">Rationale for not providing <i>Event Variables</i></a></dt>
|
||||
</dl>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p>This page explains the rationale behind various design decisions in the <b>Boost.Threads</b>
|
||||
library. Having the rationale documented here should explain how we arrived
|
||||
at the current design as well as prevent future rehashing of discussions and
|
||||
thought processes that have already occurred. It can also give users a lot of
|
||||
insight into the design process required for this library.</p>
|
||||
<h2><a name="library"></a>Rationale for the Creation of <b>Boost.Threads</b></h2>
|
||||
<p>Processes often have a degree of "potential parallelism" and it can
|
||||
often be more intuitive to design systems with this in mind. Further, these
|
||||
parallel processes can result in more responsive programs. The benefits for
|
||||
multithreaded programming are quite well known to most modern programmers, yet
|
||||
the C++ language doesn't directly support this concept.</p>
|
||||
<p>Many platforms support multithreaded programming despite the fact that the
|
||||
language doesn't support it. They do this through external libraries, which
|
||||
are, unfortunately, platform specific. POSIX has tried to address this problem
|
||||
through the standardization of a "pthread" library. However, this
|
||||
is a standard only on POSIX platforms, so its portability is limited.</p>
|
||||
<p>Another problem with POSIX and other platform specific thread libraries is
|
||||
that they are almost universally C based libraries. This leaves several C++
|
||||
specific issues unresolved, such as what happens when an exception is thrown
|
||||
in a thread. Further, there are some C++ concepts, such as destructors, that
|
||||
can make usage much easier than what's available in a C library.</p>
|
||||
<p>What's truly needed is C++ language support for threads. However, the C++
|
||||
standards committee needs existing practice or a good proposal as a starting
|
||||
point for adding this to the standard.</p>
|
||||
<p>The <b>Boost.Threads</b> library was developed to provide a C++ developer with
|
||||
a portable interface for writing multithreaded programs on numerous platforms.
|
||||
There's a hope that the library can be the basis for a more detailed proposal
|
||||
for the C++ standards committee to consider for inclusion in the next C++ standard.</p>
|
||||
<h2><a name="primitives"></a>Rationale for the Low Level Primitives Supported
|
||||
in <b>Boost.Threads</b></h2>
|
||||
<p>The <b>Boost.Threads</b> library supplies a set of low level primitives for
|
||||
writing multithreaded programs, such as mutexes and condition variables. In
|
||||
fact, the first release of <b>Boost.Threads</b> supports only these low level
|
||||
primitives. However, computer science research has shown that use of these primitives
|
||||
is difficult since it's difficult to mathematically prove that a usage pattern
|
||||
is correct, meaning it doesn't result in race conditions or deadlocks. There
|
||||
are several algebras (such as CSP, CCS and Join calculus) that have been developed
|
||||
to help write provably correct parallel processes. In order to prove the correctness
|
||||
these processes must be coded using higher level abstractions. So why does <b>Boost.Threads</b>
|
||||
support the lower level concepts?</p>
|
||||
<p>The reason is simple: the higher level concepts need to be implemented using
|
||||
at least some of the lower level concepts. So having portable lower level concepts
|
||||
makes it easier to develop the higher level concepts and will allow researchers
|
||||
to experiment with various techniques.</p>
|
||||
<p>Beyond this theoretical application of higher level concepts, however, the
|
||||
fact remains that many multithreaded programs are written using only the lower
|
||||
level concepts, so they are useful in and of themselves, even if it's hard
|
||||
to prove that their usage is correct. Since many users will be familiar with
|
||||
these lower level concepts but be unfamiliar with any of the higher level concepts
|
||||
there's also an argument for accessibility.</p>
|
||||
<h2><a name="lock_objects"></a>Rationale for the Lock Design</h2>
|
||||
<p>Programmers who are used to multithreaded programming issues will quickly note
|
||||
that the Boost.Thread's design for mutex lock concepts is not <a href="definitions.html#Thread-safe">thread-safe</a>
|
||||
(this is clearly documented as well). At first this may seem like a serious
|
||||
design flaw. Why have a multithreading primitive that's not thread-safe
|
||||
itself?</p>
|
||||
<p>A lock object is not a synchronization primitive. A lock object's sole
|
||||
responsibility is to ensure that a mutex is both locked and unlocked in a manner
|
||||
that won't result in the common error of locking a mutex and then forgetting
|
||||
to unlock it. This means that instances of a lock object are only going to be
|
||||
created, at least in theory, within block scope and won't be shared between
|
||||
threads. Only the mutex objects will be created outside of block scope and/or
|
||||
shared between threads. Though it's possible to create a lock object outside
|
||||
of block scope and to share it between threads to do so would not be a typical
|
||||
usage (in fact, to do so would likely be an error). Nor are there any cases
|
||||
when such usage would be required.</p>
|
||||
<p>Lock objects must maintain some state information. In order to allow a program
|
||||
to determine if a try_lock or timed_lock was successful the lock object must
|
||||
retain state indicating the success or failure of the call made in its constructor.
|
||||
If a lock object were to have such state and remain thread-safe it would need
|
||||
to synchronize access to the state information which would result in roughly
|
||||
doubling the time of most operations. Worse, since checking the state can occur
|
||||
only by a call after construction we'd have a race condition if the lock
|
||||
object were shared between threads.</p>
|
||||
<p>So, to avoid the overhead of synchronizing access to the state information
|
||||
and to avoid the race condition the <b>Boost.Threads</b> library simply does
|
||||
nothing to make lock objects thread-safe. Instead, sharing a lock object between
|
||||
threads results in undefined behavior. Since the only proper usage of lock objects
|
||||
is within block scope this isn't a problem, and so long as the lock object
|
||||
is properly used there's no danger of any multithreading issues.</p>
|
||||
<h2><a name="non-copyable"></a>Rationale for NonCopyable Thread Type</h2>
|
||||
<p>Programmers who are used to C libraries for multithreaded programming are likely
|
||||
to wonder why <b>Boost.Threads</b> uses a noncopyable design for <a href="thread.html">boost::thread</a>.
|
||||
After all, the C thread types are copyable, and you often have a need for copying
|
||||
them within user code. However, careful comparison of C designs to C++ designs
|
||||
shows a flaw in this logic.</p>
|
||||
<p>All C types are copyable. It is, in fact, not possible to make a noncopyable
|
||||
type in C. For this reason types that represent system resources in C are often
|
||||
designed to behave very similarly to a pointer to dynamic memory. There's
|
||||
an API for acquiring the resource and an API for releasing the resources. For
|
||||
memory we have pointers as the type and alloc/free for the acquisition and release
|
||||
APIs. For files we have FILE* as the type and fopen/fclose for the acquisition
|
||||
and release APIs. You can freely copy instances of the types but must manually
|
||||
manage the lifetime of the actual resource through the acquisition and release
|
||||
APIs.</p>
|
||||
<p>C++ designs recognize that the acquisition and release APIs are error prone
|
||||
and try to eliminate possible errors by acquiring the resource in the constructor
|
||||
and releasing it in the destructor. The best example of such a design is the
|
||||
std::iostream set of classes which can represent the same resource as the FILE*
|
||||
type in C. A file is opened in the std::fstream's constructor and closed
|
||||
in its destructor. However, if an iostream were copyable it could lead to a
|
||||
file being closed twice, an obvious error, so the std::iostream types are noncopyable
|
||||
by design. This is the same design used by boost::thread, which is a simple
|
||||
and easy to understand design that's consistent with other C++ standard
|
||||
types.</p>
|
||||
<p>During the design of boost::thread it was pointed out that it would be possible
|
||||
to allow it to be a copyable type if some form of "reference management"
|
||||
were used, such as ref-counting or ref-lists, and many argued for a boost::thread_ref
|
||||
design instead. The reasoning was that copying "thread" objects was
|
||||
a typical need in the C libraries, and so presumably would be in the C++ libraries
|
||||
as well. It was also thought that implementations could provide more efficient
|
||||
reference management than wrappers (such as boost::shared_ptr) around a noncopyable
|
||||
thread concept. Analysis of whether or not these arguments would hold true doesn't
|
||||
appear to bear them out. To illustrate the analysis we'll first provide
|
||||
pseudo-code illustrating the six typical usage patterns of a thread object.</p>
|
||||
<h3>1. Simple creation of a thread.</h3>
|
||||
<pre>void foo()
|
||||
{
|
||||
create_thread(&bar);
|
||||
}
|
||||
</pre>
|
||||
<h3>2. Creation of a thread that's later joined.</h3>
|
||||
<pre>Void foo()
|
||||
{
|
||||
thread = create_thread(&bar);
|
||||
join(thread);
|
||||
}
|
||||
</pre>
|
||||
<h3>3. Simple creation of several threads in a loop.</h3>
|
||||
<pre>Void foo()
|
||||
{
|
||||
for (int i=0; i<NUM_THREADS; ++i)
|
||||
create_thread(&bar);
|
||||
}
|
||||
</pre>
|
||||
<h3>4. Creation of several threads in a loop which are later joined.</h3>
|
||||
<pre>Void foo()
|
||||
{
|
||||
for (int i=0; i<NUM_THREADS; ++i)
|
||||
threads[i] = create_thread(&bar);
|
||||
for (int i=0; i<NUM_THREADS; ++i)
|
||||
threads[i].join();
|
||||
}
|
||||
</pre>
|
||||
<h3>5. Creation of a thread whose ownership is passed to another object/method.</h3>
|
||||
<pre>Void foo()
|
||||
{
|
||||
thread = create_thread(&bar);
|
||||
manager.owns(thread);
|
||||
}
|
||||
</pre>
|
||||
<h3>6. Creation of a thread whose ownership is shared between multiple objects.</h3>
|
||||
<pre>Void foo()
|
||||
{
|
||||
thread = create_thread(&bar);
|
||||
manager1.add(thread);
|
||||
manager2.add(thread);
|
||||
}
|
||||
</pre>
|
||||
<p>Of these usage patterns there's only one that requires reference management
|
||||
(number 6). Hopefully it's fairly obvious that this usage pattern simply
|
||||
won't occur as often as the other usage patterns. So there really isn't
|
||||
a "typical need" for a thread concept, though there is some need.</p>
|
||||
<p>Since the need isn't typical we must use different criteria for deciding
|
||||
on either a thread_ref or thread design. Possible criteria include ease of use
|
||||
and performance. So let's analyze both of these carefully.</p>
|
||||
<p>With ease of use we can look at existing experience. The standard C++ objects
|
||||
that represent a system resource, such as std::iostream, are noncopyable, so
|
||||
we know that C++ programmers must at least be experienced with this design.
|
||||
Most C++ developers are also used to smart pointers such as boost::shared_ptr,
|
||||
so we know they can at least adapt to a thread_ref concept with little effort.
|
||||
So existing experience isn't going to lead us to a choice.</p>
|
||||
<p>The other thing we can look at is how difficult it is to use both types for
|
||||
the six usage patterns above. If we find it overly difficult to use a concept
|
||||
for any of the usage patterns there would be a good argument for choosing the
|
||||
other design. So we'll code all six usage patterns using both designs.</p>
|
||||
<h3>1.</h3>
|
||||
<pre>void foo()
|
||||
{
|
||||
thread thrd(&bar);
|
||||
}
|
||||
|
||||
void foo()
|
||||
{
|
||||
thread_ref thrd = create_thread(&bar);
|
||||
}
|
||||
</pre>
|
||||
<h3>2.</h3>
|
||||
<pre>void foo()
|
||||
{
|
||||
thread thrd(&bar);
|
||||
thrd.join();
|
||||
}
|
||||
|
||||
void foo()
|
||||
{
|
||||
thread_ref thrd =
|
||||
create_thread(&bar);thrd->join();
|
||||
}
|
||||
</pre>
|
||||
<h3>3.</h3>
|
||||
<pre>void foo()
|
||||
{
|
||||
for (int i=0; i<NUM_THREADS; ++i)
|
||||
thread thrd(&bar);
|
||||
}
|
||||
|
||||
void foo()
|
||||
{
|
||||
for (int i=0; i<NUM_THREADS; ++i)
|
||||
thread_ref thrd = create_thread(&bar);
|
||||
}
|
||||
</pre>
|
||||
<h3>4.</h3>
|
||||
<pre>void foo()
|
||||
{
|
||||
std::auto_ptr<thread> threads[NUM_THREADS];
|
||||
for (int i=0; i<NUM_THREADS; ++i)
|
||||
threads[i] = std::auto_ptr<thread>(new thread(&bar));
|
||||
for (int i= 0; i<NUM_THREADS;
|
||||
++i)threads[i]->join();
|
||||
}
|
||||
|
||||
void foo()
|
||||
{
|
||||
thread_ref threads[NUM_THREADS];
|
||||
for (int i=0; i<NUM_THREADS; ++i)
|
||||
threads[i] = create_thread(&bar);
|
||||
for (int i= 0; i<NUM_THREADS;
|
||||
++i)threads[i]->join();
|
||||
}
|
||||
</pre>
|
||||
<h3>5.</h3>
|
||||
<pre>void foo()
|
||||
{
|
||||
thread thrd* = new thread(&bar);
|
||||
manager.owns(thread);
|
||||
}
|
||||
|
||||
void foo()
|
||||
{
|
||||
thread_ref thrd = create_thread(&bar);
|
||||
manager.owns(thrd);
|
||||
}
|
||||
</pre>
|
||||
<h3>6.</h3>
|
||||
<pre>void foo()
|
||||
{
|
||||
boost::shared_ptr<thread> thrd(new thread(&bar));
|
||||
manager1.add(thrd);
|
||||
manager2.add(thrd);
|
||||
}
|
||||
|
||||
void foo()
|
||||
{
|
||||
thread_ref thrd = create_thread(&bar);
|
||||
manager1.add(thrd);
|
||||
manager2.add(thrd);
|
||||
}
|
||||
</pre>
|
||||
<p>This shows the usage patterns being nearly identical in complexity for both
|
||||
designs. The only actual added complexity occurs because of the use of operator
|
||||
new in (4), (5) and (6) and the use of std::auto_ptr and boost::shared_ptr in
|
||||
(4) and (6) respectively. However, that's not really much added complexity,
|
||||
and C++ programmers are used to using these idioms any way. Some may dislike
|
||||
the presence of operator new in user code, but this can be eliminated by proper
|
||||
design of higher level concepts, such as the boost::thread_group class that
|
||||
simplifies example (4) down to:</p>
|
||||
<pre>void foo()
|
||||
{
|
||||
thread_group threads;
|
||||
for (int i=0; i<NUM_THREADS; ++i)
|
||||
threads.create_thread(&bar);
|
||||
threads.join_all();
|
||||
}
|
||||
</pre>
|
||||
<p>So ease of use is really a wash and not much help in picking a design.</p>
|
||||
<p>So what about performance? If you look at the above code examples we can analyze
|
||||
the theoretical impact to performance that both designs have. For (1) we can
|
||||
see that platforms that don't have a ref-counted native thread type (POSIX,
|
||||
for instance) will be impacted by a thread_ref design. Even if the native thread
|
||||
type is ref-counted there may be an impact if more state information has to
|
||||
be maintained for concepts foreign to the native API, such as clean up stacks
|
||||
for Win32 implementations. For (2) the performance impact will be identical
|
||||
to (1). The same for (3). For (4) things get a little more interesting and we
|
||||
find that theoretically at least the thread_ref may perform faster since the
|
||||
thread design requires dynamic memory allocation/deallocation. However, in practice
|
||||
there may be dynamic allocation for the thread_ref design as well, it will just
|
||||
be hidden from the user. As long as the implementation has to do dynamic allocations
|
||||
the thread_ref loses again because of the reference management. For (5) we see
|
||||
the same impact as we do for (4). For (6) we still have a possible impact to
|
||||
the thread design because of dynamic allocation but thread_ref no longer suffers
|
||||
because of its reference management, and in fact, theoretically at least, the
|
||||
thread_ref may do a better job of managing the references. All of this indicates
|
||||
that thread wins for (1), (2) and (3), with (4) and (5) the winner depends on
|
||||
the implementation and the platform but the thread design probably has a better
|
||||
chance, and with (6) it will again depend on the implementation and platform
|
||||
but this time we favor thread_ref slightly. Given all of this it's a narrow
|
||||
margin, but the thread design prevails.</p>
|
||||
<p>Given this analysis, and the fact that noncopyable objects for system resources
|
||||
are the normal designs that C++ programmers are used to dealing with, the <b>Boost.Threads</b>
|
||||
library has gone with a noncopyable design.</p>
|
||||
<h2><a name="events"></a>Rationale for not providing <i>Event Variables</i></h2>
|
||||
<p><i>Event variables</i> are simply far too error-prone. <a href=
|
||||
"condition.html">Condition variables</a> are a much safer alternative.</p>
|
||||
<p>[Note that Graphical User Interface <i>events</i> are a different concept,
|
||||
and are not what is being discussed here.]</p>
|
||||
<p>Event variables were one of the first synchronization primitives. They are
|
||||
still used today, for example, in the native Windows multithreading API.</p>
|
||||
<p>Yet both respected computer science researchers and experienced multithreading
|
||||
practitioners believe event variables are so inherently error-prone that they
|
||||
should never be used, and thus should not be part of a multithreading library.</p>
|
||||
<p>Per Brinch Hansen <a href="bibliography.html#Brinch-Hansen-73"> [Brinch Hansen
|
||||
73]</a> analyzed event variables in some detail, pointing out [emphasis his]
|
||||
that "<i>event operations force the programmer to be aware of the relative
|
||||
speeds of the sending and receiving processes</i>". His summary:</p>
|
||||
<blockquote>
|
||||
<p>We must therefore conclude that event variables of the previous type are
|
||||
impractical for system design. <i>The effect of an interaction between two
|
||||
processes must be independent of the speed at which it is carried out.</i></p>
|
||||
</blockquote>
|
||||
<p>Experienced programmers using the Windows platform today report that event
|
||||
variables are a continuing source of errors, even after previous bad experiences
|
||||
caused them to be very careful in their use of event variables. Overt problems
|
||||
can be avoided, for example, by teaming the event variable with a mutex, but
|
||||
that may just convert a <a href="definitions.html#definition-race-condition">race condition</a> into another problem,
|
||||
such as excessive resource use. One of the most distressing aspects of the experience
|
||||
reports is the claim that many defects are latent. That is, the programs appear
|
||||
to work correctly, but contain hidden timing dependencies which will cause them
|
||||
to fail when environmental factors or usage patterns change, altering relative
|
||||
thread timings.</p>
|
||||
<p>The decision to exclude event variables from <b>Boost.Threads</b> has been
|
||||
surprising to some Windows programmers. They have written programs which work
|
||||
using event variables, and wonder what the problem is. It seems similar to the
|
||||
"goto considered harmful" controversy of 30 years ago. It isn't
|
||||
that events, like gotos, can't be made to work, but rather that virtually
|
||||
all programs using alternatives will be easier to write, debug, read, maintain,
|
||||
and be less likely to contain latent defects.</p>
|
||||
<p>[Rationale provided by Beman Dawes]</p>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->09 January, 2003<!--webbot bot="Timestamp" endspan i-checksum="38582" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
434
doc/rationale.xml
Normal file
434
doc/rationale.xml
Normal file
@@ -0,0 +1,434 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<section id="threads.rationale" last-revision="$Date$">
|
||||
<title>Rationale</title>
|
||||
<para>This page explains the rationale behind various design decisions in the
|
||||
&Boost.Threads; library. Having the rationale documented here should explain
|
||||
how we arrived at the current design as well as prevent future rehashing of
|
||||
discussions and thought processes that have already occurred. It can also give
|
||||
users a lot of insight into the design process required for this
|
||||
library.</para>
|
||||
<section id="threads.rationale.Boost.Threads">
|
||||
<title>Rationale for the Creation of &Boost.Threads;</title>
|
||||
<para>Processes often have a degree of "potential parallelism" and it can
|
||||
often be more intuitive to design systems with this in mind. Further, these
|
||||
parallel processes can result in more responsive programs. The benefits for
|
||||
multithreaded programming are quite well known to most modern programmers,
|
||||
yet the C++ language doesn't directly support this concept.</para>
|
||||
<para>Many platforms support multithreaded programming despite the fact that
|
||||
the language doesn't support it. They do this through external libraries,
|
||||
which are, unfortunately, platform specific. POSIX has tried to address this
|
||||
problem through the standardization of a "pthread" library. However, this is
|
||||
a standard only on POSIX platforms, so its portability is limited.</para>
|
||||
<para>Another problem with POSIX and other platform specific thread
|
||||
libraries is that they are almost universally C based libraries. This leaves
|
||||
several C++ specific issues unresolved, such as what happens when an
|
||||
exception is thrown in a thread. Further, there are some C++ concepts, such
|
||||
as destructors, that can make usage much easier than what's available in a C
|
||||
library.</para>
|
||||
<para>What's truly needed is C++ language support for threads. However, the
|
||||
C++ standards committee needs existing practice or a good proposal as a
|
||||
starting point for adding this to the standard.</para>
|
||||
<para>The &Boost.Threads; library was developed to provide a C++ developer
|
||||
with a portable interface for writing multithreaded programs on numerous
|
||||
platforms. There's a hope that the library can be the basis for a more
|
||||
detailed proposal for the C++ standards committee to consider for inclusion
|
||||
in the next C++ standard.</para>
|
||||
</section>
|
||||
<section id="threads.rationale.primitives">
|
||||
<title>Rationale for the Low Level Primitives Supported in &Boost.Threads;</title>
|
||||
<para>The &Boost.Threads; library supplies a set of low level primitives for
|
||||
writing multithreaded programs, such as mutexes and condition variables. In
|
||||
fact, the first release of &Boost.Threads; supports only these low level
|
||||
primitives. However, computer science research has shown that use of these
|
||||
primitives is difficult since it's difficult to mathematically prove that a
|
||||
usage pattern is correct, meaning it doesn't result in race conditions or
|
||||
deadlocks. There are several algebras (such as CSP, CCS and Join calculus)
|
||||
that have been developed to help write provably correct parallel
|
||||
processes. In order to prove the correctness these processes must be coded
|
||||
using higher level abstractions. So why does &Boost.Threads; support the
|
||||
lower level concepts?</para>
|
||||
<para>The reason is simple: the higher level concepts need to be implemented
|
||||
using at least some of the lower level concepts. So having portable lower
|
||||
level concepts makes it easier to develop the higher level concepts and will
|
||||
allow researchers to experiment with various techniques.</para>
|
||||
<para>Beyond this theoretical application of higher level concepts, however,
|
||||
the fact remains that many multithreaded programs are written using only the
|
||||
lower level concepts, so they are useful in and of themselves, even if it's
|
||||
hard to prove that their usage is correct. Since many users will be familiar
|
||||
with these lower level concepts but unfamiliar with any of the higher
|
||||
level concepts, supporting the lower level concepts provides
|
||||
greater accessibility.</para>
|
||||
</section>
|
||||
<section id="threads.rationale.locks">
|
||||
<title>Rationale for the Lock Design</title>
|
||||
<para>Programmers who are used to multithreaded programming issues will
|
||||
quickly note that the &Boost.Threads; design for mutex lock concepts is not
|
||||
<link linkend="threads.glossary.thread-safe">thread-safe</link> (this is
|
||||
clearly documented as well). At first this may seem like a serious design
|
||||
flaw. Why have a multithreading primitive that's not thread-safe
|
||||
itself?</para>
|
||||
<para>A lock object is not a synchronization primitive. A lock object's sole
|
||||
responsibility is to ensure that a mutex is both locked and unlocked in a
|
||||
manner that won't result in the common error of locking a mutex and then
|
||||
forgetting to unlock it. This means that instances of a lock object are only
|
||||
going to be created, at least in theory, within block scope and won't be
|
||||
shared between threads. Only the mutex objects will be created outside of
|
||||
block scope and/or shared between threads. Though it's possible to create a
|
||||
lock object outside of block scope and to share it between threads, to do so
|
||||
would not be a typical usage (in fact, to do so would likely be an
|
||||
error). Nor are there any cases when such usage would be required.</para>
|
||||
<para>Lock objects must maintain some state information. In order to allow a
|
||||
program to determine if a try_lock or timed_lock was successful the lock
|
||||
object must retain state indicating the success or failure of the call made
|
||||
in its constructor. If a lock object were to have such state and remain
|
||||
thread-safe it would need to synchronize access to the state information
|
||||
which would result in roughly doubling the time of most operations. Worse,
|
||||
since checking the state can occur only by a call after construction, we'd
|
||||
have a race condition if the lock object were shared between threads.</para>
|
||||
<para>So, to avoid the overhead of synchronizing access to the state
|
||||
information and to avoid the race condition, the &Boost.Threads; library
|
||||
simply does nothing to make lock objects thread-safe. Instead, sharing a
|
||||
lock object between threads results in undefined behavior. Since the only
|
||||
proper usage of lock objects is within block scope this isn't a problem, and
|
||||
so long as the lock object is properly used there's no danger of any
|
||||
multithreading issues.</para>
|
||||
</section>
|
||||
<section id="threads.rationale.non-copyable">
|
||||
<title>Rationale for NonCopyable Thread Type</title>
|
||||
<para>Programmers who are used to C libraries for multithreaded programming
|
||||
are likely to wonder why &Boost.Threads; uses a noncopyable design for
|
||||
<classname>boost::thread</classname>. After all, the C thread types are
|
||||
copyable, and you often have a need for copying them within user
|
||||
code. However, careful comparison of C designs to C++ designs shows a flaw
|
||||
in this logic.</para>
|
||||
<para>All C types are copyable. It is, in fact, not possible to make a
|
||||
noncopyable type in C. For this reason types that represent system resources
|
||||
in C are often designed to behave very similarly to a pointer to dynamic
|
||||
memory. There's an API for acquiring the resource and an API for releasing
|
||||
the resource. For memory we have pointers as the type and alloc/free for
|
||||
the acquisition and release APIs. For files we have FILE* as the type and
|
||||
fopen/fclose for the acquisition and release APIs. You can freely copy
|
||||
instances of the types but must manually manage the lifetime of the actual
|
||||
resource through the acquisition and release APIs.</para>
|
||||
<para>C++ designs recognize that the acquisition and release APIs are error
|
||||
prone and try to eliminate possible errors by acquiring the resource in the
|
||||
constructor and releasing it in the destructor. The best example of such a
|
||||
design is the std::iostream set of classes which can represent the same
|
||||
resource as the FILE* type in C. A file is opened in the std::fstream's
|
||||
constructor and closed in its destructor. However, if an iostream were
|
||||
copyable it could lead to a file being closed twice, an obvious error, so
|
||||
the std::iostream types are noncopyable by design. This is the same design
|
||||
used by boost::thread, which is a simple and easy to understand design
|
||||
that's consistent with other C++ standard types.</para>
|
||||
<para>During the design of boost::thread it was pointed out that it would be
|
||||
possible to allow it to be a copyable type if some form of "reference
|
||||
management" were used, such as ref-counting or ref-lists, and many argued
|
||||
for a boost::thread_ref design instead. The reasoning was that copying
|
||||
"thread" objects was a typical need in the C libraries, and so presumably
|
||||
would be in the C++ libraries as well. It was also thought that
|
||||
implementations could provide more efficient reference management than
|
||||
wrappers (such as boost::shared_ptr) around a noncopyable thread
|
||||
concept. Analysis of whether or not these arguments would hold true doesn't
|
||||
appear to bear them out. To illustrate the analysis we'll first provide
|
||||
pseudo-code illustrating the six typical usage patterns of a thread
|
||||
object.</para>
|
||||
<section id="threads.rationale.non-copyable.simple">
|
||||
<title>1. Use case: Simple creation of a thread.</title>
|
||||
<programlisting>
|
||||
void foo()
|
||||
{
|
||||
create_thread(&bar);
|
||||
}
|
||||
</programlisting>
|
||||
</section>
|
||||
<section id="threads.rationale.non-copyable.joined">
|
||||
<title>2. Use case: Creation of a thread that's later joined.</title>
|
||||
<programlisting>
|
||||
void foo()
|
||||
{
|
||||
thread = create_thread(&bar);
|
||||
join(thread);
|
||||
}
|
||||
</programlisting>
|
||||
</section>
|
||||
<section id="threads.rationale.non-copyable.loop">
|
||||
<title>3. Use case: Simple creation of several threads in a loop.</title>
|
||||
<programlisting>
|
||||
void foo()
|
||||
{
|
||||
for (int i=0; i<NUM_THREADS; ++i)
|
||||
create_thread(&bar);
|
||||
}
|
||||
</programlisting>
|
||||
</section>
|
||||
<section id="threads.rationale.non-copyable.loop-join">
|
||||
<title>4. Use case: Creation of several threads in a loop which are later joined.</title>
|
||||
<programlisting>
|
||||
void foo()
|
||||
{
|
||||
for (int i=0; i<NUM_THREADS; ++i)
|
||||
threads[i] = create_thread(&bar);
|
||||
for (int i=0; i<NUM_THREADS; ++i)
|
||||
threads[i].join();
|
||||
}
|
||||
</programlisting>
|
||||
</section>
|
||||
<section id="threads.rationale.non-copyable.pass">
|
||||
<title>5. Use case: Creation of a thread whose ownership is passed to another object/method.</title>
|
||||
<programlisting>
|
||||
void foo()
|
||||
{
|
||||
thread = create_thread(&bar);
|
||||
manager.owns(thread);
|
||||
}
|
||||
</programlisting>
|
||||
</section>
|
||||
<section id="threads.rationale.non-copyable.shared">
|
||||
<title>6. Use case: Creation of a thread whose ownership is shared between multiple
|
||||
objects.</title>
|
||||
<programlisting>
|
||||
void foo()
|
||||
{
|
||||
thread = create_thread(&bar);
|
||||
manager1.add(thread);
|
||||
manager2.add(thread);
|
||||
}
|
||||
</programlisting>
|
||||
</section>
|
||||
<para>Of these usage patterns there's only one that requires reference
|
||||
management (number 6). Hopefully it's fairly obvious that this usage pattern
|
||||
simply won't occur as often as the other usage patterns. So there really
|
||||
isn't a "typical need" for a thread concept, though there is some
|
||||
need.</para>
|
||||
<para>Since the need isn't typical we must use different criteria for
|
||||
deciding on either a thread_ref or thread design. Possible criteria include
|
||||
ease of use and performance. So let's analyze both of these
|
||||
carefully.</para>
|
||||
<para>With ease of use we can look at existing experience. The standard C++
|
||||
objects that represent a system resource, such as std::iostream, are
|
||||
noncopyable, so we know that C++ programmers must at least be experienced
|
||||
with this design. Most C++ developers are also used to smart pointers such
|
||||
as boost::shared_ptr, so we know they can at least adapt to a thread_ref
|
||||
concept with little effort. So existing experience isn't going to lead us to
|
||||
a choice.</para>
|
||||
<para>The other thing we can look at is how difficult it is to use both
|
||||
types for the six usage patterns above. If we find it overly difficult to
|
||||
use a concept for any of the usage patterns there would be a good argument
|
||||
for choosing the other design. So we'll code all six usage patterns using
|
||||
both designs.</para>
|
||||
<section id="threads.rationale_comparison.non-copyable.simple">
|
||||
<title>1. Comparison: simple creation of a thread.</title>
|
||||
<programlisting>
|
||||
void foo()
|
||||
{
|
||||
thread thrd(&bar);
|
||||
}
|
||||
void foo()
|
||||
{
|
||||
thread_ref thrd = create_thread(&bar);
|
||||
}
|
||||
</programlisting>
|
||||
</section>
|
||||
<section id="threads.rationale_comparison.non-copyable.joined">
|
||||
<title>2. Comparison: creation of a thread that's later joined.</title>
|
||||
<programlisting>
|
||||
void foo()
|
||||
{
|
||||
thread thrd(&bar);
|
||||
thrd.join();
|
||||
}
|
||||
void foo()
|
||||
{
|
||||
thread_ref thrd =
|
||||
create_thread(&bar);thrd->join();
|
||||
}
|
||||
</programlisting>
|
||||
</section>
|
||||
<section id="threads.rationale_comparison.non-copyable.loop">
|
||||
<title>3. Comparison: simple creation of several threads in a loop.</title>
|
||||
<programlisting>
|
||||
void foo()
|
||||
{
|
||||
for (int i=0; i<NUM_THREADS; ++i)
|
||||
thread thrd(&bar);
|
||||
}
|
||||
void foo()
|
||||
{
|
||||
for (int i=0; i<NUM_THREADS; ++i)
|
||||
thread_ref thrd = create_thread(&bar);
|
||||
}
|
||||
</programlisting>
|
||||
</section>
|
||||
<section id="threads.rationale_comparison.non-copyable.loop-join">
|
||||
<title>4. Comparison: creation of several threads in a loop which are later joined.</title>
|
||||
<programlisting>
|
||||
void foo()
|
||||
{
|
||||
std::auto_ptr<thread> threads[NUM_THREADS];
|
||||
for (int i=0; i<NUM_THREADS; ++i)
|
||||
threads[i] = std::auto_ptr<thread>(new thread(&bar));
|
||||
for (int i= 0; i<NUM_THREADS;
|
||||
++i)threads[i]->join();
|
||||
}
|
||||
void foo()
|
||||
{
|
||||
thread_ref threads[NUM_THREADS];
|
||||
for (int i=0; i<NUM_THREADS; ++i)
|
||||
threads[i] = create_thread(&bar);
|
||||
for (int i= 0; i<NUM_THREADS;
|
||||
++i)threads[i]->join();
|
||||
}
|
||||
</programlisting>
|
||||
</section>
|
||||
<section id="threads.rationale_comparison.non-copyable.pass">
|
||||
<title>5. Comparison: creation of a thread whose ownership is passed to another object/method.</title>
|
||||
<programlisting>
|
||||
void foo()
|
||||
{
|
||||
thread thrd* = new thread(&bar);
|
||||
manager.owns(thread);
|
||||
}
|
||||
void foo()
|
||||
{
|
||||
thread_ref thrd = create_thread(&bar);
|
||||
manager.owns(thrd);
|
||||
}
|
||||
</programlisting>
|
||||
</section>
|
||||
<section id="threads.rationale_comparison.non-copyable.shared">
|
||||
<title>6. Comparison: creation of a thread whose ownership is shared
|
||||
between multiple objects.</title>
|
||||
<programlisting>
|
||||
void foo()
|
||||
{
|
||||
boost::shared_ptr<thread> thrd(new thread(&bar));
|
||||
manager1.add(thrd);
|
||||
manager2.add(thrd);
|
||||
}
|
||||
void foo()
|
||||
{
|
||||
thread_ref thrd = create_thread(&bar);
|
||||
manager1.add(thrd);
|
||||
manager2.add(thrd);
|
||||
}
|
||||
</programlisting>
|
||||
</section>
|
||||
<para>This shows the usage patterns being nearly identical in complexity for
|
||||
both designs. The only actual added complexity occurs because of the use of
|
||||
operator new in
|
||||
<link linkend="threads.rationale_comparison.non-copyable.loop-join">(4)</link>,
|
||||
<link linkend="threads.rationale_comparison.non-copyable.pass">(5)</link>, and
|
||||
<link linkend="threads.rationale_comparison.non-copyable.shared">(6)</link>;
|
||||
and the use of std::auto_ptr and boost::shared_ptr in
|
||||
<link linkend="threads.rationale_comparison.non-copyable.loop-join">(4)</link> and
|
||||
<link linkend="threads.rationale_comparison.non-copyable.shared">(6)</link>
|
||||
respectively. However, that's not really
|
||||
much added complexity, and C++ programmers are used to using these idioms
|
||||
anyway. Some may dislike the presence of operator new in user code, but
|
||||
this can be eliminated by proper design of higher level concepts, such as
|
||||
the boost::thread_group class that simplifies example
|
||||
<link linkend="threads.rationale_comparison.non-copyable.loop-join">(4)</link>
|
||||
down to:</para>
|
||||
<programlisting>
|
||||
void foo()
|
||||
{
|
||||
thread_group threads;
|
||||
for (int i=0; i<NUM_THREADS; ++i)
|
||||
threads.create_thread(&bar);
|
||||
threads.join_all();
|
||||
}
|
||||
</programlisting>
|
||||
<para>So ease of use is really a wash and not much help in picking a
|
||||
design.</para>
|
||||
<para>So what about performance? Looking at the above code examples,
|
||||
we can analyze the theoretical impact to performance that both designs
|
||||
have. For <link linkend="threads.rationale_comparison.non-copyable.simple">(1)</link>
|
||||
we can see that platforms that don't have a ref-counted native
|
||||
thread type (POSIX, for instance) will be impacted by a thread_ref
|
||||
design. Even if the native thread type is ref-counted there may be an impact
|
||||
if more state information has to be maintained for concepts foreign to the
|
||||
native API, such as clean up stacks for Win32 implementations.
|
||||
For <link linkend="threads.rationale_comparison.non-copyable.joined">(2)</link>
|
||||
and <link linkend="threads.rationale_comparison.non-copyable.loop">(3)</link>
|
||||
the performance impact will be identical to
|
||||
<link linkend="threads.rationale_comparison.non-copyable.simple">(1)</link>.
|
||||
For <link linkend="threads.rationale_comparison.non-copyable.loop-join">(4)</link>
|
||||
things get a little more interesting and we find that theoretically at least
|
||||
the thread_ref may perform faster since the thread design requires dynamic
|
||||
memory allocation/deallocation. However, in practice there may be dynamic
|
||||
allocation for the thread_ref design as well, it will just be hidden from
|
||||
the user. As long as the implementation has to do dynamic allocations the
|
||||
thread_ref loses again because of the reference management. For
|
||||
<link linkend="threads.rationale_comparison.non-copyable.pass">(5)</link> we see
|
||||
the same impact as we do for
|
||||
<link linkend="threads.rationale_comparison.non-copyable.loop-join">(4)</link>.
|
||||
For <link linkend="threads.rationale_comparison.non-copyable.shared">(6)</link>
|
||||
we still have a possible impact to
|
||||
the thread design because of dynamic allocation but thread_ref no longer
|
||||
suffers because of its reference management, and in fact, theoretically at
|
||||
least, the thread_ref may do a better job of managing the references. All of
|
||||
this indicates that thread wins for
|
||||
<link linkend="threads.rationale_comparison.non-copyable.simple">(1)</link>,
|
||||
<link linkend="threads.rationale_comparison.non-copyable.joined">(2)</link> and
|
||||
<link linkend="threads.rationale_comparison.non-copyable.loop">(3)</link>; with
|
||||
<link linkend="threads.rationale_comparison.non-copyable.loop-join">(4)</link>
|
||||
and <link linkend="threads.rationale_comparison.non-copyable.pass">(5)</link> the
|
||||
winner depending on the implementation and the platform but with the thread design
|
||||
probably having a better chance; and with
|
||||
<link linkend="threads.rationale_comparison.non-copyable.shared">(6)</link>
|
||||
it will again depend on the
|
||||
implementation and platform but this time we favor thread_ref
|
||||
slightly. Given all of this it's a narrow margin, but the thread design
|
||||
prevails.</para>
|
||||
<para>Given this analysis, and the fact that noncopyable objects for system
|
||||
resources are the normal designs that C++ programmers are used to dealing
|
||||
with, the &Boost.Threads; library has gone with a noncopyable design.</para>
|
||||
</section>
|
||||
<section id="threads.rationale.events">
|
||||
<title>Rationale for not providing <emphasis>Event Variables</emphasis></title>
|
||||
<para><emphasis>Event variables</emphasis> are simply far too
|
||||
error-prone. <classname>boost::condition</classname> variables are a much safer
|
||||
alternative. [Note that Graphical User Interface <emphasis>events</emphasis> are
|
||||
a different concept, and are not what is being discussed here.]</para>
|
||||
<para>Event variables were one of the first synchronization primitives. They
|
||||
are still used today, for example, in the native Windows multithreading
|
||||
API. Yet both respected computer science researchers and experienced
|
||||
multithreading practitioners believe event variables are so inherently
|
||||
error-prone that they should never be used, and thus should not be part of a
|
||||
multithreading library.</para>
|
||||
<para>Per Brinch Hansen &cite.Hansen73; analyzed event variables in some
|
||||
detail, pointing out [emphasis his] that "<emphasis>event operations force
|
||||
the programmer to be aware of the relative speeds of the sending and
|
||||
receiving processes</emphasis>". His summary:</para>
|
||||
<blockquote>
|
||||
<para>We must therefore conclude that event variables of the previous type
|
||||
are impractical for system design. <emphasis>The effect of an interaction
|
||||
between two processes must be independent of the speed at which it is
|
||||
carried out.</emphasis></para>
|
||||
</blockquote>
|
||||
<para>Experienced programmers using the Windows platform today report that
|
||||
event variables are a continuing source of errors, even after previous bad
|
||||
experiences caused them to be very careful in their use of event
|
||||
variables. Overt problems can be avoided, for example, by teaming the event
|
||||
variable with a mutex, but that may just convert a <link
|
||||
linkend="threads.glossary.race-condition">race condition</link> into another
|
||||
problem, such as excessive resource use. One of the most distressing aspects
|
||||
of the experience reports is the claim that many defects are latent. That
|
||||
is, the programs appear to work correctly, but contain hidden timing
|
||||
dependencies which will cause them to fail when environmental factors or
|
||||
usage patterns change, altering relative thread timings.</para>
|
||||
<para>The decision to exclude event variables from &Boost.Threads; has been
|
||||
surprising to some Windows programmers. They have written programs which
|
||||
work using event variables, and wonder what the problem is. It seems similar
|
||||
to the "goto considered harmful" controversy of 30 years ago. It isn't that
|
||||
events, like gotos, can't be made to work, but rather that virtually all
|
||||
programs using alternatives will be easier to write, debug, read, maintain,
|
||||
and will be less likely to contain latent defects.</para>
|
||||
<para>[Rationale provided by Beman Dawes]</para>
|
||||
</section>
|
||||
</section>
|
||||
302
doc/recursive_mutex-ref.xml
Normal file
302
doc/recursive_mutex-ref.xml
Normal file
@@ -0,0 +1,302 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<header name="boost/thread/recursive_mutex.hpp"
|
||||
last-revision="$Date$">
|
||||
<namespace name="boost">
|
||||
<class name="recursive_mutex">
|
||||
<purpose>
|
||||
<para>The <classname>recursive_mutex</classname> class is a model of the
|
||||
<link linkend="threads.concepts.Mutex">Mutex</link> concept.</para>
|
||||
</purpose>
|
||||
|
||||
<description>
|
||||
<para>The <classname>recursive_mutex</classname> class is a model of the
|
||||
<link linkend="threads.concepts.Mutex">Mutex</link> concept.
|
||||
It should be used to synchronize access to shared resources using
|
||||
<link linkend="threads.concepts.recursive-locking-strategy">Recursive</link>
|
||||
locking mechanics.</para>
|
||||
|
||||
<para>For classes that model related mutex concepts, see
|
||||
<classname>recursive_try_mutex</classname> and <classname>recursive_timed_mutex</classname>.</para>
|
||||
|
||||
<para>For <link linkend="threads.concepts.unspecified-locking-strategy">Unspecified</link>
|
||||
locking mechanics, see <classname>mutex</classname>,
|
||||
<classname>try_mutex</classname>, and <classname>timed_mutex</classname>.
|
||||
</para>
|
||||
|
||||
<para>The <classname>recursive_mutex</classname> class supplies the following typedef,
|
||||
which models the specified locking strategy:
|
||||
|
||||
<table>
|
||||
<title>Supported Lock Types</title>
|
||||
<tgroup cols="2" align="left">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Lock Name</entry>
|
||||
<entry>Lock Concept</entry>
|
||||
</row>
|
||||
</thead>
|
||||
<tbody>
|
||||
<row>
|
||||
<entry>scoped_lock</entry>
|
||||
<entry><link linkend="threads.concepts.ScopedLock">ScopedLock</link></entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
</para>
|
||||
|
||||
<para>The <classname>recursive_mutex</classname> class uses a
|
||||
<link linkend="threads.concepts.recursive-locking-strategy">Recursive</link>
|
||||
locking strategy, so attempts to recursively lock a
|
||||
<classname>recursive_mutex</classname> object
|
||||
succeed and an internal "lock count" is maintained.
|
||||
Attempts to unlock a <classname>recursive_mutex</classname> object
|
||||
by threads that don't own a lock on it result in
|
||||
<emphasis role="bold">undefined behavior</emphasis>.</para>
|
||||
|
||||
<para>Like all
|
||||
<link linkend="threads.concepts.mutex-models">mutex models</link>
|
||||
in &Boost.Threads;, <classname>recursive_mutex</classname> leaves the
|
||||
<link linkend="threads.concepts.sheduling-policies">scheduling policy</link>
|
||||
as <link linkend="threads.concepts.unspecified-scheduling-policy">Unspecified</link>.
|
||||
Programmers should make no assumptions about the order in which
|
||||
waiting threads acquire a lock.</para>
|
||||
</description>
|
||||
|
||||
<inherit access="private">
|
||||
<type><classname>boost::noncopyable</classname></type>
|
||||
<purpose>Exposition only</purpose>
|
||||
</inherit>
|
||||
|
||||
<typedef name="scoped_lock">
|
||||
<type><emphasis>implementation-defined</emphasis></type>
|
||||
</typedef>
|
||||
|
||||
<constructor>
|
||||
<effects>Constructs a <classname>recursive_mutex</classname> object.
|
||||
</effects>
|
||||
|
||||
<postconditions><code>*this</code> is in an unlocked state.
|
||||
</postconditions>
|
||||
</constructor>
|
||||
|
||||
<destructor>
|
||||
<effects>Destroys a <classname>recursive_mutex</classname> object.</effects>
|
||||
|
||||
<requires><code>*this</code> is in an unlocked state.</requires>
|
||||
|
||||
<notes><emphasis role="bold">Danger:</emphasis> Destruction of a
|
||||
locked mutex is a serious programming error resulting in undefined
|
||||
behavior such as a program crash.</notes>
|
||||
</destructor>
|
||||
</class>
|
||||
|
||||
<class name="recursive_try_mutex">
|
||||
<purpose>
|
||||
<para>The <classname>recursive_try_mutex</classname> class is a model of the
|
||||
<link linkend="threads.concepts.TryMutex">TryMutex</link> concept.</para>
|
||||
</purpose>
|
||||
|
||||
<description>
|
||||
<para>The <classname>recursive_try_mutex</classname> class is a model of the
|
||||
<link linkend="threads.concepts.TryMutex">TryMutex</link> concept.
|
||||
It should be used to synchronize access to shared resources using
|
||||
<link linkend="threads.concepts.recursive-locking-strategy">Recursive</link>
|
||||
locking mechanics.</para>
|
||||
|
||||
<para>For classes that model related mutex concepts, see
|
||||
<classname>recursive_mutex</classname> and <classname>recursive_timed_mutex</classname>.</para>
|
||||
|
||||
<para>For <link linkend="threads.concepts.unspecified-locking-strategy">Unspecified</link>
|
||||
locking mechanics, see <classname>mutex</classname>,
|
||||
<classname>try_mutex</classname>, and <classname>timed_mutex</classname>.
|
||||
</para>
|
||||
|
||||
<para>The <classname>recursive_try_mutex</classname> class supplies the following typedefs,
|
||||
which model the specified locking strategies:
|
||||
|
||||
<table>
|
||||
<title>Supported Lock Types</title>
|
||||
<tgroup cols="2" align="left">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Lock Name</entry>
|
||||
<entry>Lock Concept</entry>
|
||||
</row>
|
||||
</thead>
|
||||
<tbody>
|
||||
<row>
|
||||
<entry>scoped_lock</entry>
|
||||
<entry><link linkend="threads.concepts.ScopedLock">ScopedLock</link></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>scoped_try_lock</entry>
|
||||
<entry><link linkend="threads.concepts.ScopedTryLock">ScopedTryLock</link></entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
</para>
|
||||
|
||||
<para>The <classname>recursive_try_mutex</classname> class uses a
|
||||
<link linkend="threads.concepts.recursive-locking-strategy">Recursive</link>
|
||||
locking strategy, so attempts to recursively lock a
|
||||
<classname>recursive_try_mutex</classname> object
|
||||
succeed and an internal "lock count" is maintained.
|
||||
Attempts to unlock a <classname>recursive_mutex</classname> object
|
||||
by threads that don't own a lock on it result in
|
||||
<emphasis role="bold">undefined behavior</emphasis>.</para>
|
||||
|
||||
<para>Like all
|
||||
<link linkend="threads.concepts.mutex-models">mutex models</link>
|
||||
in &Boost.Threads;, <classname>recursive_try_mutex</classname> leaves the
|
||||
<link linkend="threads.concepts.sheduling-policies">scheduling policy</link>
|
||||
as <link linkend="threads.concepts.unspecified-scheduling-policy">Unspecified</link>.
|
||||
Programmers should make no assumptions about the order in which
|
||||
waiting threads acquire a lock.</para>
|
||||
</description>
|
||||
|
||||
<inherit access="private">
|
||||
<type><classname>boost::noncopyable</classname></type>
|
||||
<purpose>Exposition only</purpose>
|
||||
</inherit>
|
||||
|
||||
<typedef name="scoped_lock">
|
||||
<type><emphasis>implementation-defined</emphasis></type>
|
||||
</typedef>
|
||||
|
||||
<typedef name="scoped_try_lock">
|
||||
<type><emphasis>implementation-defined</emphasis></type>
|
||||
</typedef>
|
||||
|
||||
<constructor>
|
||||
<effects>Constructs a <classname>recursive_try_mutex</classname> object.
|
||||
</effects>
|
||||
|
||||
<postconditions><code>*this</code> is in an unlocked state.
|
||||
</postconditions>
|
||||
</constructor>
|
||||
|
||||
<destructor>
|
||||
<effects>Destroys a <classname>recursive_try_mutex</classname> object.
|
||||
</effects>
|
||||
|
||||
<requires><code>*this</code> is in an unlocked state.</requires>
|
||||
|
||||
<notes><emphasis role="bold">Danger:</emphasis> Destruction of a
|
||||
locked mutex is a serious programming error resulting in undefined
|
||||
behavior such as a program crash.</notes>
|
||||
</destructor>
|
||||
</class>
|
||||
|
||||
<class name="recursive_timed_mutex">
|
||||
<purpose>
|
||||
<para>The <classname>recursive_timed_mutex</classname> class is a model of the
|
||||
<link linkend="threads.concepts.TimedMutex">TimedMutex</link> concept.</para>
|
||||
</purpose>
|
||||
|
||||
<description>
|
||||
<para>The <classname>recursive_timed_mutex</classname> class is a model of the
|
||||
<link linkend="threads.concepts.TimedMutex">TimedMutex</link> concept.
|
||||
It should be used to synchronize access to shared resources using
|
||||
<link linkend="threads.concepts.recursive-locking-strategy">Recursive</link>
|
||||
locking mechanics.</para>
|
||||
|
||||
<para>For classes that model related mutex concepts, see
|
||||
<classname>recursive_mutex</classname> and <classname>recursive_try_mutex</classname>.</para>
|
||||
|
||||
<para>For <link linkend="threads.concepts.unspecified-locking-strategy">Unspecified</link>
|
||||
locking mechanics, see <classname>mutex</classname>,
|
||||
<classname>try_mutex</classname>, and <classname>timed_mutex</classname>.
|
||||
</para>
|
||||
|
||||
<para>The <classname>recursive_timed_mutex</classname> class supplies the following typedefs,
|
||||
which model the specified locking strategies:
|
||||
|
||||
<table>
|
||||
<title>Supported Lock Types</title>
|
||||
<tgroup cols="2" align="left">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Lock Name</entry>
|
||||
<entry>Lock Concept</entry>
|
||||
</row>
|
||||
</thead>
|
||||
<tbody>
|
||||
<row>
|
||||
<entry>scoped_lock</entry>
|
||||
<entry><link linkend="threads.concepts.ScopedLock">ScopedLock</link></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>scoped_try_lock</entry>
|
||||
<entry><link linkend="threads.concepts.ScopedTryLock">ScopedTryLock</link></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>scoped_timed_lock</entry>
|
||||
<entry><link linkend="threads.concepts.ScopedTimedLock">ScopedTimedLock</link></entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
</para>
|
||||
|
||||
<para>The <classname>recursive_timed_mutex</classname> class uses a
|
||||
<link linkend="threads.concepts.recursive-locking-strategy">Recursive</link>
|
||||
locking strategy, so attempts to recursively lock a
|
||||
<classname>recursive_timed_mutex</classname> object
|
||||
succeed and an internal "lock count" is maintained.
|
||||
Attempts to unlock a <classname>recursive_mutex</classname> object
|
||||
by threads that don't own a lock on it result in
|
||||
<emphasis role="bold">undefined behavior</emphasis>.</para>
|
||||
|
||||
<para>Like all
|
||||
<link linkend="threads.concepts.mutex-models">mutex models</link>
|
||||
in &Boost.Threads;, <classname>recursive_timed_mutex</classname> leaves the
|
||||
<link linkend="threads.concepts.sheduling-policies">scheduling policy</link>
|
||||
as <link linkend="threads.concepts.unspecified-scheduling-policy">Unspecified</link>.
|
||||
Programmers should make no assumptions about the order in which
|
||||
waiting threads acquire a lock.</para>
|
||||
</description>
|
||||
|
||||
<inherit access="private">
|
||||
<type><classname>boost::noncopyable</classname></type>
|
||||
<purpose>Exposition only</purpose>
|
||||
</inherit>
|
||||
|
||||
<typedef name="scoped_lock">
|
||||
<type><emphasis>implementation-defined</emphasis></type>
|
||||
</typedef>
|
||||
|
||||
<typedef name="scoped_try_lock">
|
||||
<type><emphasis>implementation-defined</emphasis></type>
|
||||
</typedef>
|
||||
|
||||
<typedef name="scoped_timed_lock">
|
||||
<type><emphasis>implementation-defined</emphasis></type>
|
||||
</typedef>
|
||||
|
||||
<constructor>
|
||||
<effects>Constructs a <classname>recursive_timed_mutex</classname> object.
|
||||
</effects>
|
||||
|
||||
<postconditions><code>*this</code> is in an unlocked state.
|
||||
</postconditions>
|
||||
</constructor>
|
||||
|
||||
<destructor>
|
||||
<effects>Destroys a <classname>recursive_timed_mutex</classname> object.</effects>
|
||||
|
||||
<requires><code>*this</code> is in an unlocked state.</requires>
|
||||
|
||||
<notes><emphasis role="bold">Danger:</emphasis> Destruction of a
|
||||
locked mutex is a serious programming error resulting in undefined
|
||||
behavior such as a program crash.</notes>
|
||||
</destructor>
|
||||
</class>
|
||||
</namespace>
|
||||
</header>
|
||||
@@ -1,244 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - Header <boost/thread/recursive_mutex.hpp></title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Header <<a href="../../../boost/thread/recursive_mutex.hpp">boost/thread/recursive_mutex.hpp</a>></h2> </td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<h2>Contents</h2>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#classes">Classes</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-recursive_mutex">Class <code>recursive_mutex</code></a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-recursive_mutex-synopsis">Class <code>recursive_mutex</code>
|
||||
synopsis</a></dt>
|
||||
<dt><a href="#class-recursive_mutex-ctors">Class <code>recursive_mutex</code>
|
||||
constructors and destructor</a></dt>
|
||||
</dl>
|
||||
<dt><a href="#class-recursive_try_mutex">Class <code>recursive_try_mutex</code></a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-recursive_try_mutex-synopsis">Class <code>recursive_try_mutex</code>
|
||||
synopsis</a></dt>
|
||||
<dt><a href="#class-recursive_try_mutex-ctors">Class <code>recursive_try_mutex</code>
|
||||
constructors and destructor</a></dt>
|
||||
</dl>
|
||||
<dt><a href="#class-recursive_timed_mutex">Class <code>recursive_timed_mutex</code></a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-recursive_timed_mutex-synopsis">Class <code>recursive_timed_mutex</code>
|
||||
synopsis</a></dt>
|
||||
<dt><a href="#class-recursive_timed_mutex-ctors">Class <code>recursive_timed_mutex</code>
|
||||
constructors and destructor</a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
<dt><a href="#examples">Example(s)</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p>Include the header <<a href="../../../boost/thread/recursive_mutex.hpp">boost/thread/recursive_mutex.hpp</a>>
|
||||
to define the <a href="#class-recursive_mutex">recursive_mutex</a>, <a href="#class-recursive_try_mutex">recursive_try_mutex</a>
|
||||
and <a href="#class-recursive_timed_mutex">recursive_timed_mutex</a> classes.</p>
|
||||
<p>The <a href="#class-recursive_mutex">recursive_mutex</a>, <a href="#class-recursive_try_mutex">recursive_try_mutex</a>
|
||||
and <a href="#class-recursive_timed_mutex">recursive_timed_mutex</a> classes
|
||||
are models of <a href="mutex_concept.html#Mutex-concept">Mutex</a>, <a href="mutex_concept.html#TryMutex-concept">TryMutex</a>,
|
||||
and <a href="mutex_concept.html#TimedMutex-concept">TimedMutex</a> respectively.
|
||||
These types should be used to synchronize access to shared resources when recursive
|
||||
locking by a single thread is likely to occur. A good example for this is when
|
||||
a class supplies "internal synchronization" to ensure <a href="definitions.html#Thread-safe">
|
||||
thread-safety</a> and a function of the class may have to call other functions
|
||||
of the class which also attempt to lock the mutex. For recursive locking mechanics,
|
||||
see <a href="mutex.html">mutexes</a>.</p>
|
||||
<p>Each class supplies one or more typedefs for lock types which model matching
|
||||
lock concepts. For the best possible performance you should use the mutex class
|
||||
that supports the minimum set of lock types that you need.</p>
|
||||
<table summary="lock types" border="1" cellpadding="5">
|
||||
<tr>
|
||||
<td><b>Mutex Class</b></td>
|
||||
<td><b>Lock name</b></td>
|
||||
<td><b>Lock Concept</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><a href="#recursive_mutex Synopsis"><code> recursive_mutex</code></a></td>
|
||||
<td valign="middle"><code>scoped_lock</code></td>
|
||||
<td valign="middle"><a href="lock_concept.html#ScopedLock"> ScopedLock</a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code><a href="#recursive_try_mutex Synopsis"> recursive_try_mutex</a></code></td>
|
||||
<td valign="middle"><code>scoped_lock<br>
|
||||
scoped_try_lock</code></td>
|
||||
<td valign="middle"><a href="lock_concept.html#ScopedLock"> ScopedLock</a><br>
|
||||
<a href="lock_concept.html#ScopedTryLock"> ScopedTryLock</a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td valign="top"><code><a href=
|
||||
"#recursive_timed_mutex Synopsis"> recursive_timed_mutex</a></code>
|
||||
</td>
|
||||
<td valign="middle"><code>scoped_lock<br>
|
||||
scoped_try_lock<br>
|
||||
scoped_timed_lock</code></td>
|
||||
<td valign="middle"><a href="lock_concept.html#ScopedLock"> ScopedLock</a><br>
|
||||
<a href="lock_concept.html#ScopedTryLock"> ScopedTryLock</a><br>
|
||||
<a href="lock_concept.html#ScopedTimedLock"> ScopedTimedLock</a></td>
|
||||
</tr>
|
||||
</table>
|
||||
<p>The <code>recursive_mutex</code>, <code>recursive_try_mutex</code> and <code>recursive_timed_mutex</code>
|
||||
employ a <code>Recursive</code> <a href="mutex_concept.html#LockingStrategies">locking
|
||||
strategy</a>, so attempts to recursively lock them succeed and an internal "lock
|
||||
count" is maintained. Attempts to unlock them by a thread that does not
|
||||
own a lock on them will result in <b>undefined behavior</b>.</p>
|
||||
<p>The <code>recursive_mutex</code>, <code>recursive_try_mutex</code> and <code>recursive_timed_mutex</code>
|
||||
leave the <a href=
|
||||
"mutex_concept.html#SchedulingPolicies">scheduling policy</a> as <code>
|
||||
Unspecified</code>. Programmers should assume that threads waiting for a lock
|
||||
on objects of these types acquire the lock in a random order, even though the
|
||||
specific behavior for a given platform may be different.</p>
|
||||
<h2><a name="classes"></a>Classes</h2>
|
||||
<h3><a name="class-recursive_mutex"></a>Class <code>recursive_mutex</code></h3>
|
||||
<p>The <code>recursive_mutex</code> class is a model of <a href="mutex_concept.html#Mutex-concept">Mutex</a>
|
||||
and <a href="overview.html#non-copyable">NonCopyable</a>, and provides no additional
|
||||
facilities beyond the requirements of these concepts.</p>
|
||||
<h4><a name="class-recursive_mutex-synopsis"></a>Class <code>recursive_mutex</code>
|
||||
synopsis</h4>
|
||||
<pre>
|
||||
namespace boost
|
||||
{
|
||||
class recursive_mutex : private boost::noncopyable // Exposition only.
|
||||
// Class recursive_mutex meets the NonCopyable requirement.
|
||||
{
|
||||
public:
|
||||
typedef [implementation defined; see Introduction] scoped_lock;
|
||||
|
||||
recursive_mutex();
|
||||
~recursive_mutex();
|
||||
};
|
||||
};
|
||||
</pre>
|
||||
<h4><a name="class-recursive_mutex-ctors"></a>Class <code>recursive_mutex</code>
|
||||
constructors and destructor</h4>
|
||||
<pre>
|
||||
recursive_mutex();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Postconditions:</b> <code>*this</code> is in an unlocked state.</dt>
|
||||
</dl>
|
||||
<pre>
|
||||
~recursive_mutex();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>*this</code> is in an unlocked sate.</dt>
|
||||
<dt><b>Danger:</b> Destruction of a locked mutex is a serious programming error
|
||||
resulting in undefined behavior such as a program crash.</dt>
|
||||
</dl>
|
||||
<h3><a name="class-recursive_try_mutex"></a>Class <code>recursive_try_mutex</code></h3>
|
||||
<p>The <code>recursive_try_mutex</code> class is a model of <a href="mutex_concept.html#TryMutex-concept">TryMutex</a>
|
||||
and <a href="overview.html#non-copyable">NonCopyable</a>, and provides no additional
|
||||
facilities beyond the requirements of these concepts.</p>
|
||||
<h4><a name="class-recursive_try_mutex-synopsis"></a>Class <code>recursive_try_mutex</code>
|
||||
synopsis</h4>
|
||||
<pre>
|
||||
namespace boost
|
||||
{
|
||||
class recursive_mutex : private boost::noncopyable // Exposition only.
|
||||
// Class recursive_mutex meets the NonCopyable requirement.
|
||||
{
|
||||
Public:
|
||||
typedef [implementation defined; see Introduction] scoped_lock;
|
||||
typedef [implementation defined; see Introduction] scoped_try_lock;
|
||||
|
||||
recursive_try_mutex();
|
||||
~recursive_try_mutex();
|
||||
};
|
||||
};
|
||||
</pre>
|
||||
<h4><a name="class-recursive_try_mutex-ctors"></a>Class <code>recursive_try_mutex</code>
|
||||
constructors and destructor</h4>
|
||||
<pre>
|
||||
recursive_try_mutex();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Postconditions:</b> <code>*this</code> is in an unlocked state.</dt>
|
||||
</dl>
|
||||
<pre>
|
||||
~recursive_try_mutex();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>*this</code> is in an unlocked sate.</dt>
|
||||
<dt><b>Danger:</b> Destruction of a locked mutex is a serious programming error
|
||||
resulting in undefined behavior such as a program crash.</dt>
|
||||
</dl>
|
||||
<h3><a name="class-recursive_timed_mutex"></a>Class <code>recursive_timed_mutex</code></h3>
|
||||
<p>The <code>recursive_timed_mutex</code> class is a model of <a href="mutex_concept.html#TimedMutex-concept">TimedMutex</a>
|
||||
and <a href="overview.html#non-copyable">NonCopyable</a>, and provides no additional
|
||||
facilities beyond the requirements of these concepts.</p>
|
||||
<h4><a name="class-recursive_timed_mutex-synopsis"></a>Class <code>recursive_timed_mutex</code>
|
||||
synopsis</h4>
|
||||
<pre>
|
||||
namespace boost
|
||||
{
|
||||
class recursive_timed_mutex : private boost::noncopyable // Exposition only.
|
||||
// Class recursive_mutex meets the NonCopyable requirement.
|
||||
{
|
||||
Public:
|
||||
typedef [implementation defined; see Introduction] scoped_lock;
|
||||
typedef [implementation defined; see Introduction] scoped_try_lock;
|
||||
typedef [implementation defined; see Introduction] scoped_timed_lock;
|
||||
|
||||
recursive_timed_mutex();
|
||||
~recursive_timed_mutex();
|
||||
};
|
||||
};
|
||||
</pre>
|
||||
<h4><a name="class-recursive_timed_mutex-ctors"></a>Class <code>recursive_timed_mutex</code>
|
||||
constructors and destructor</h4>
|
||||
<pre>
|
||||
recursive_timed_mutex();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Postconditions:</b> <code>*this</code> is in an unlocked state.</dt>
|
||||
</dl>
|
||||
<pre>
|
||||
~recursive_timed_mutex();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>*this</code> is in an unlocked sate.</dt>
|
||||
<dt><b>Danger:</b> Destruction of a locked mutex is a serious programming error
|
||||
resulting in undefined behavior such as a program crash.</dt>
|
||||
</dl>
|
||||
<h2><a name="examples"></a>Example(s)</h2>
|
||||
<p><a href="../example/recursive_mutex.cpp">libs/thread/example/recursive_mutex.cpp</a></p>
|
||||
<p>The output is:</p>
|
||||
<pre>
|
||||
count == 1
|
||||
count == 2
|
||||
count == 3
|
||||
count == 4
|
||||
</pre>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2001
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
19
doc/reference.xml
Normal file
19
doc/reference.xml
Normal file
@@ -0,0 +1,19 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<library-reference id="threads.reference"
|
||||
last-revision="$Date$"
|
||||
xmlns:xi="http://www.w3.org/2001/XInclude">
|
||||
<xi:include href="barrier-ref.xml"/>
|
||||
<xi:include href="condition-ref.xml"/>
|
||||
<xi:include href="exceptions-ref.xml"/>
|
||||
<xi:include href="mutex-ref.xml"/>
|
||||
<xi:include href="once-ref.xml"/>
|
||||
<xi:include href="recursive_mutex-ref.xml"/>
|
||||
<xi:include href="thread-ref.xml"/>
|
||||
<xi:include href="tss-ref.xml"/>
|
||||
<xi:include href="xtime-ref.xml"/>
|
||||
</library-reference>
|
||||
144
doc/release_notes.xml
Normal file
144
doc/release_notes.xml
Normal file
@@ -0,0 +1,144 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<section id="threads.release_notes" last-revision="$Date$">
|
||||
<title>Release Notes</title>
|
||||
<section id="threads.release_notes.boost_1_32_0">
|
||||
<title>Boost 1.32.0</title>
|
||||
|
||||
<section id="threads.release_notes.boost_1_32_0.change_log.documentation">
|
||||
<title>Documentation converted to BoostBook</title>
|
||||
|
||||
<para>The documentation was converted to BoostBook format,
|
||||
and a number of errors and inconsistencies were
|
||||
fixed in the process.
|
||||
Since this was a fairly large task, there are likely to be
|
||||
more errors and inconsistencies remaining. If you find any,
|
||||
please report them!</para>
|
||||
</section>
|
||||
|
||||
<section id="threads.release_notes.boost_1_32_0.change_log.static_link">
|
||||
<title>Statically-link build option added</title>
|
||||
|
||||
<para>The option to link &Boost.Threads; as a static
|
||||
library has been added (with some limitations on Win32 platforms).
|
||||
This feature was originally removed from an earlier version
|
||||
of Boost because <classname>boost::thread_specific_ptr</classname>
|
||||
required that &Boost.Threads; be dynamically linked in order
|
||||
for its cleanup functionality to work on Win32 platforms.
|
||||
Because this limitation never applied to non-Win32 platforms,
|
||||
because significant progress has been made in removing
|
||||
the limitation on Win32 platforms (many thanks to
|
||||
Aaron LaFramboise and Roland Scwarz!), and because the lack
|
||||
of static linking is one of the most common complaints of
|
||||
&Boost.Threads; users, this decision was reversed.</para>
|
||||
|
||||
<para>On non-Win32 platforms:
|
||||
To choose the dynamically linked version of &Boost.Threads;
|
||||
using Boost's auto-linking feature, #define BOOST_THREAD_USE_DLL;
|
||||
to choose the statically linked version,
|
||||
#define BOOST_THREAD_USE_LIB.
|
||||
If neither symbols is #defined, the default will be chosen.
|
||||
Currently the default is the statically linked version.</para>
|
||||
|
||||
<para>On Win32 platforms using VC++:
|
||||
Use the same #defines as for non-Win32 platforms
|
||||
(BOOST_THREAD_USE_DLL and BOOST_THREAD_USE_LIB).
|
||||
If neither is #defined, the default will be chosen.
|
||||
Currently the default is the statically linked version
|
||||
if the VC++ run-time library is set to
|
||||
"Multi-threaded" or "Multi-threaded Debug", and
|
||||
the dynamically linked version
|
||||
if the VC++ run-time library is set to
|
||||
"Multi-threaded DLL" or "Multi-threaded Debug DLL".</para>
|
||||
|
||||
<para>On Win32 platforms using compilers other than VC++:
|
||||
Use the same #defines as for non-Win32 platforms
|
||||
(BOOST_THREAD_USE_DLL and BOOST_THREAD_USE_LIB).
|
||||
If neither is #defined, the default will be chosen.
|
||||
Currently the default is the dynamically linked version
|
||||
because it has not yet been possible to implement automatic
|
||||
tss cleanup in the statically linked version for compilers
|
||||
other than VC++, although it is hoped that this will be
|
||||
possible in a future version of &Boost.Threads;.
|
||||
|
||||
Note for advanced users: &Boost.Threads; provides several "hook"
|
||||
functions to allow users to experiment with the statically
|
||||
linked version on Win32 with compilers other than VC++.
|
||||
These functions are on_process_enter(), on_process_exit(),
|
||||
on_thread_enter(), and on_thread_exit(), and are defined
|
||||
in tls_hooks.cpp. See the comments in that file for more
|
||||
information.</para>
|
||||
</section>
|
||||
|
||||
<section id="threads.release_notes.boost_1_32_0.change_log.barrier">
|
||||
<title>Barrier functionality added</title>
|
||||
|
||||
<para>A new class, <classname>boost::barrier</classname>, was added.</para>
|
||||
</section>
|
||||
|
||||
<section id="threads.release_notes.boost_1_32_0.change_log.read_write_mutex">
|
||||
<title>Read/write mutex functionality added</title>
|
||||
|
||||
<para>New classes,
|
||||
<classname>boost::read_write_mutex</classname>,
|
||||
<classname>boost::try_read_write_mutex</classname>, and
|
||||
<classname>boost::timed_read_write_mutex</classname>
|
||||
were added.
|
||||
|
||||
<note>Since the read/write mutex and related classes are new,
|
||||
both interface and implementation are liable to change
|
||||
in future releases of &Boost.Threads;.
|
||||
The lock concepts and lock promotion in particular are
|
||||
still under discussion and very likely to change.</note>
|
||||
</para>
|
||||
</section>
|
||||
|
||||
<section id="threads.release_notes.boost_1_32_0.change_log.thread_specific_ptr">
|
||||
<title>Thread-specific pointer functionality changed</title>
|
||||
|
||||
<para>The <classname>boost::thread_specific_ptr</classname>
|
||||
constructor now takes an optional pointer to a cleanup function that
|
||||
is called to release the thread-specific data that is being pointed
|
||||
to by <classname>boost::thread_specific_ptr</classname> objects.</para>
|
||||
|
||||
<para>Fixed: the number of available thread-specific storage "slots"
|
||||
is too small on some platforms.</para>
|
||||
|
||||
<para>Fixed: <functionname>thread_specific_ptr::reset()</functionname>
|
||||
doesn't check error returned by <functionname>tss::set()</functionname>
|
||||
(the <functionname>tss::set()</functionname> function now throws
|
||||
if it fails instead of returning an error code).</para>
|
||||
|
||||
<para>Fixed: calling
|
||||
<functionname>boost::thread_specific_ptr::reset()</functionname> or
|
||||
<functionname>boost::thread_specific_ptr::release()</functionname>
|
||||
causes double-delete: once when
|
||||
<functionname>boost::thread_specific_ptr::reset()</functionname> or
|
||||
<functionname>boost::thread_specific_ptr::release()</functionname>
|
||||
is called and once when
|
||||
<functionname>boost::thread_specific_ptr::~thread_specific_ptr()</functionname>
|
||||
is called.</para>
|
||||
</section>
|
||||
|
||||
<section id="threads.release_notes.boost_1_32_0.change_log.mutex">
|
||||
<title>Mutex implementation changed for Win32</title>
|
||||
|
||||
<para>On Win32, <classname>boost::mutex</classname>,
|
||||
<classname>boost::try_mutex</classname>, <classname>boost::recursive_mutex</classname>,
|
||||
and <classname>boost::recursive_try_mutex</classname> now use a Win32 critical section
|
||||
whenever possible; otherwise they use a Win32 mutex. As before,
|
||||
<classname>boost::timed_mutex</classname> and
|
||||
<classname>boost::recursive_timed_mutex</classname> use a Win32 mutex.</para>
|
||||
</section>
|
||||
|
||||
<section id="threads.release_notes.boost_1_32_0.change_log.wince">
|
||||
<title>Windows CE support improved</title>
|
||||
|
||||
<para>Minor changes were made to make Boost.Threads work on Windows CE.</para>
|
||||
</section>
|
||||
</section>
|
||||
</section>
|
||||
266
doc/thread-ref.xml
Normal file
266
doc/thread-ref.xml
Normal file
@@ -0,0 +1,266 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<header name="boost/thread/thread.hpp"
|
||||
last-revision="$Date$">
|
||||
<namespace name="boost">
|
||||
<class name="thread">
|
||||
<purpose>
|
||||
<para>The <classname>thread</classname> class represents threads of
|
||||
execution, and provides the functionality to create and manage
|
||||
threads within the &Boost.Threads; library. See
|
||||
<xref linkend="threads.glossary"/> for a precise description of
|
||||
<link linkend="threads.glossary.thread">thread of execution</link>,
|
||||
and for definitions of threading-related terms and of thread states such as
|
||||
<link linkend="threads.glossary.thread-state">blocked</link>.</para>
|
||||
</purpose>
|
||||
|
||||
<description>
|
||||
<para>A <link linkend="threads.glossary.thread">thread of execution</link>
|
||||
has an initial function. For the program's initial thread, the initial
|
||||
function is <code>main()</code>. For other threads, the initial
|
||||
function is <code>operator()</code> of the function object passed to
|
||||
the <classname>thread</classname> object's constructor.</para>
|
||||
|
||||
<para>A thread of execution is said to be "finished"
|
||||
or to have "finished execution" when its initial function returns or
|
||||
is terminated. This includes completion of all thread cleanup
|
||||
handlers, and completion of the normal C++ function return behaviors,
|
||||
such as destruction of automatic storage (stack) objects and releasing
|
||||
any associated implementation resources.</para>
|
||||
|
||||
<para>A thread object has an associated state which is either
|
||||
"joinable" or "non-joinable".</para>
|
||||
|
||||
<para>Except as described below, the policy used by an implementation
|
||||
of &Boost.Threads; to schedule transitions between thread states is
|
||||
unspecified.</para>
|
||||
|
||||
<para><note>Just as the lifetime of a file may be different from the
|
||||
lifetime of an <code>iostream</code> object which represents the file, the lifetime
|
||||
of a thread of execution may be different from the
|
||||
<classname>thread</classname> object which represents the thread of
|
||||
execution. In particular, after a call to <code>join()</code>,
|
||||
the thread of execution will no longer exist even though the
|
||||
<classname>thread</classname> object continues to exist until the
|
||||
end of its normal lifetime. The converse is also possible; if
|
||||
a <classname>thread</classname> object is destroyed without
|
||||
<code>join()</code> first having been called, the thread of execution
|
||||
continues until its initial function completes.</note></para>
|
||||
</description>
|
||||
|
||||
<inherit access="private">
|
||||
<type><classname>boost::noncopyable</classname></type>
|
||||
<purpose>Exposition only</purpose>
|
||||
</inherit>
|
||||
|
||||
<constructor>
|
||||
<effects>Constructs a <classname>thread</classname> object
|
||||
representing the current thread of execution.</effects>
|
||||
|
||||
<postconditions><code>*this</code> is non-joinable.</postconditions>
|
||||
|
||||
<notes><emphasis role="bold">Danger:</emphasis>
|
||||
<code>*this</code> is valid only within the current thread.</notes>
|
||||
</constructor>
|
||||
|
||||
<constructor specifiers="explicit">
|
||||
<parameter name="threadfunc">
|
||||
<paramtype>const boost::function0<void>&</paramtype>
|
||||
</parameter>
|
||||
|
||||
<effects>
|
||||
Starts a new thread of execution and constructs a
|
||||
<classname>thread</classname> object representing it.
|
||||
Copies <code>threadfunc</code> (which in turn copies
|
||||
the function object wrapped by <code>threadfunc</code>)
|
||||
to an internal location which persists for the lifetime
|
||||
of the new thread of execution. Calls <code>operator()</code>
|
||||
on the copy of the <code>threadfunc</code> function object
|
||||
in the new thread of execution.
|
||||
</effects>
|
||||
|
||||
<postconditions><code>*this</code> is joinable.</postconditions>
|
||||
|
||||
<throws><code>boost::thread_resource_error</code> if a new thread
|
||||
of execution cannot be started.</throws>
|
||||
</constructor>
|
||||
|
||||
<destructor>
|
||||
<effects>Destroys <code>*this</code>. The actual thread of
|
||||
execution may continue to execute after the
|
||||
<classname>thread</classname> object has been destroyed.
|
||||
</effects>
|
||||
|
||||
<notes>If <code>*this</code> is joinable the actual thread
|
||||
of execution becomes "detached". Any resources used
|
||||
by the thread will be reclaimed when the thread of execution
|
||||
completes. To ensure such a thread of execution runs to completion
|
||||
before the <classname>thread</classname> object is destroyed, call
|
||||
<code>join()</code>.</notes>
|
||||
</destructor>
|
||||
|
||||
<method-group name="comparison">
|
||||
<method name="operator==" cv="const">
|
||||
<type>bool</type>
|
||||
|
||||
<parameter name="rhs">
|
||||
<type>const thread&</type>
|
||||
</parameter>
|
||||
|
||||
<requires>The thread is non-terminated or <code>*this</code>
|
||||
is joinable.</requires>
|
||||
|
||||
<returns><code>true</code> if <code>*this</code> and
|
||||
<code>rhs</code> represent the same thread of
|
||||
execution.</returns>
|
||||
</method>
|
||||
|
||||
<method name="operator!=" cv="const">
|
||||
<type>bool</type>
|
||||
|
||||
<parameter name="rhs">
|
||||
<type>const thread&</type>
|
||||
</parameter>
|
||||
|
||||
<requires>The thread is non-terminated or <code>*this</code>
|
||||
is joinable.</requires>
|
||||
|
||||
<returns><code>!(*this==rhs)</code>.</returns>
|
||||
</method>
|
||||
</method-group>
|
||||
|
||||
<method-group name="modifier">
|
||||
<method name="join">
|
||||
<type>void</type>
|
||||
|
||||
<requires><code>*this</code> is joinable.</requires>
|
||||
|
||||
<effects>The current thread of execution blocks until the
|
||||
initial function of the thread of execution represented by
|
||||
<code>*this</code> finishes and all resources are
|
||||
reclaimed.</effects>
|
||||
|
||||
<postcondition><code>*this</code> is non-joinable.</postcondition>
|
||||
|
||||
<notes>If <code>*this == thread()</code> the result is
|
||||
implementation-defined. If the implementation doesn't
|
||||
detect this the result will be
|
||||
<link linkend="threads.glossary.deadlock">deadlock</link>.
|
||||
</notes>
|
||||
</method>
|
||||
</method-group>
|
||||
|
||||
<method-group name="static">
|
||||
<method name="sleep" specifiers="static">
|
||||
<type>void</type>
|
||||
|
||||
<parameter name="xt">
|
||||
<paramtype>const <classname>xtime</classname>&</paramtype>
|
||||
</parameter>
|
||||
|
||||
<effects>The current thread of execution blocks until
|
||||
<code>xt</code> is reached.</effects>
|
||||
</method>
|
||||
|
||||
<method name="yield" specifiers="static">
|
||||
<type>void</type>
|
||||
|
||||
<effects>The current thread of execution is placed in the
|
||||
<link linkend="threads.glossary.thread-state">ready</link>
|
||||
state.</effects>
|
||||
|
||||
<notes>
|
||||
<simpara>Allow the current thread to give up the rest of its
|
||||
time slice (or other scheduling quota) to another thread.
|
||||
Particularly useful in non-preemptive implementations.</simpara>
|
||||
</notes>
|
||||
</method>
|
||||
</method-group>
|
||||
</class>
|
||||
|
||||
<class name="thread_group">
|
||||
<purpose>
|
||||
The <classname>thread_group</classname> class provides a container
|
||||
for easy grouping of threads to simplify several common thread
|
||||
creation and management idioms.
|
||||
</purpose>
|
||||
|
||||
<inherit access="private">
|
||||
<type><classname>boost::noncopyable</classname></type>
|
||||
<purpose>Exposition only</purpose>
|
||||
</inherit>
|
||||
|
||||
|
||||
<constructor>
|
||||
<effects>Constructs an empty <classname>thread_group</classname>
|
||||
container.</effects>
|
||||
</constructor>
|
||||
|
||||
<destructor>
|
||||
<effects>Destroys each contained thread object. Destroys <code>*this</code>.</effects>
|
||||
|
||||
<notes>Behavior is undefined if another thread references
|
||||
<code>*this </code> during the execution of the destructor.
|
||||
</notes>
|
||||
</destructor>
|
||||
|
||||
<method-group name="modifier">
|
||||
<method name="create_thread">
|
||||
<type><classname>thread</classname>*</type>
|
||||
|
||||
<parameter name="threadfunc">
|
||||
<paramtype>const boost::function0<void>&</paramtype>
|
||||
</parameter>
|
||||
|
||||
<effects>Creates a new <classname>thread</classname> object
|
||||
that executes <code>threadfunc</code> and adds it to the
|
||||
<code>thread_group</code> container object's list of managed
|
||||
<classname>thread</classname> objects.</effects>
|
||||
|
||||
<returns>Pointer to the newly created
|
||||
<classname>thread</classname> object.</returns>
|
||||
</method>
|
||||
|
||||
<method name="add_thread">
|
||||
<type>void</type>
|
||||
|
||||
<parameter name="thrd">
|
||||
<paramtype><classname>thread</classname>*</paramtype>
|
||||
</parameter>
|
||||
|
||||
<effects>Adds <code>thrd</code> to the
|
||||
<classname>thread_group</classname> object's list of managed
|
||||
<classname>thread</classname> objects. The <code>thrd</code>
|
||||
object must have been allocated via <code>operator new</code> and will
|
||||
be deleted when the group is destroyed.</effects>
|
||||
</method>
|
||||
|
||||
<method name="remove_thread">
|
||||
<type>void</type>
|
||||
|
||||
<parameter name="thrd">
|
||||
<paramtype><classname>thread</classname>*</paramtype>
|
||||
</parameter>
|
||||
|
||||
<effects>Removes <code>thread</code> from <code>*this</code>'s
|
||||
list of managed <classname>thread</classname> objects.</effects>
|
||||
|
||||
<throws><emphasis role="bold">???</emphasis> if
|
||||
<code>thrd</code> is not in <code>*this</code>'s list
|
||||
of managed <classname>thread</classname> objects.</throws>
|
||||
</method>
|
||||
|
||||
<method name="join_all">
|
||||
<type>void</type>
|
||||
|
||||
<effects>Calls <code>join()</code> on each of the managed
|
||||
<classname>thread</classname> objects.</effects>
|
||||
</method>
|
||||
</method-group>
|
||||
</class>
|
||||
</namespace>
|
||||
</header>
|
||||
301
doc/thread.html
301
doc/thread.html
@@ -1,301 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - <boost/thread.hpp></title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Header <<a href="../../../boost/thread/thread.hpp">boost/thread.hpp</a>></h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<h2>Contents</h2>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#classes">Classes</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-thread">Class <code>thread</code></a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-thread-synopsis">Class <code>thread</code> synopsis</a></dt>
|
||||
<dt><a href="#class-thread-ctors">Class <code>thread</code> constructors
|
||||
and destructor</a></dt>
|
||||
<dt><a href="#class-thread-comparisons">Class <code>thread</code> comparison
|
||||
functions</a></dt>
|
||||
<dt><a href="#class-thread-modifiers">Class <code>thread</code> modifier
|
||||
functions</a></dt>
|
||||
<dt><a href="#class-thread-statics">Class <code>thread</code> static functions</a></dt>
|
||||
</dl>
|
||||
<dt><a href="#class-thread_group">Class <code>thread_group</code></a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-thread_group-synopsis">Class <code>thread_group</code>
|
||||
synopsis</a></dt>
|
||||
<dt><a href="#class-thread_group-ctors">Class <code>thread_group</code>
|
||||
constructors and destructor</a></dt>
|
||||
<dt><a href="#class-thread_group-modifiers">Class <code>thread_group</code>
|
||||
modifier functions</a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
<dt><a href="#examples">Example(s)</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#example-thread">Simple usage of <code>boost::thread</code></a></dt>
|
||||
<dt><a href="#example-thread_group">Simple usage of <code>boost::thread_group</code></a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
<hr>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p>The header <<a href="../../../boost/thread/thread.hpp">boost/thread.hpp</a>>
|
||||
defines the classes <a href="#class-thread">thread</a> and <a href="#class-thread_group">thread_group</a>
|
||||
which are used to create, observe and manage threads and groups of threads.</p>
|
||||
<h2><a name="classes"></a>Classes</h2>
|
||||
<h3><a name="class-thread"></a>Class <code>thread</code></h3>
|
||||
<p>The <code>thread</code> class represents threads of execution, and provides
|
||||
the functionality to create and manage threads within the <b> Boost.Threads</b>
|
||||
library. See <a href="definitions.html"> Definitions</a> for a precise description
|
||||
of "thread of execution", and for definitions of threading related
|
||||
terms and of thread states such as "blocked".</p>
|
||||
<p>A thread of execution has an initial function. For the program's initial
|
||||
thread, the initial function is <code>main()</code>. For other threads, the
|
||||
initial function is <code>operator()</code> of the function object passed to
|
||||
the class <code>thread</code> constructor.</p>
|
||||
<p>A thread of execution is said to be "finished" or "finished
|
||||
execution" when its initial function returns or is terminated. This includes
|
||||
completion of all thread cleanup handlers, and completion of the normal C++
|
||||
function return behaviors, such as destruction of automatic storage (stack)
|
||||
objects and releasing any associated implementation resources.</p>
|
||||
<p>A thread object has an associated state which is either "joinable"
|
||||
or "non-joinable".</p>
|
||||
<p>Except as described below, the policy used by an implementation of <b>Boost.Threads</b>
|
||||
to schedule transitions between thread states is unspecified.</p>
|
||||
<p><b>Note:</b> Just as the lifetime of a file may be different from the lifetime
|
||||
of an iostream object which represents the file, the lifetime of a thread of
|
||||
execution may be different from the <code> thread</code> object which represents
|
||||
the thread of execution. In particular, after a call to <code>join()</code>,
|
||||
the thread of execution will no longer exist even though the <code>thread</code>
|
||||
object continues to exist until the end of its normal lifetime. The converse
|
||||
is also possible; if a <code>thread</code> object is destroyed without <code>join()</code>
|
||||
having first been called, the thread of execution continues until its initial
|
||||
function completes.</p>
|
||||
<h4><a name="class-thread-synopsis"></a>Class <code>thread</code> synopsis</h4>
|
||||
<pre>namespace boost {
|
||||
class thread : <a href="../../utility/utility.htm#Class_noncopyable">boost::noncopyable</a> // Exposition only.
|
||||
// Class thread meets the <a href=
|
||||
"overview.html#non-copyable">NonCopyable</a> requirement.
|
||||
{
|
||||
public:
|
||||
thread();
|
||||
explicit thread(const boost::function0<void>& threadfunc);
|
||||
~thread();
|
||||
|
||||
bool operator==(const thread& rhs) const;
|
||||
bool operator!=(const thread& rhs) const;
|
||||
|
||||
void join();
|
||||
|
||||
static void sleep(const xtime& xt);
|
||||
static void yield();
|
||||
};
|
||||
} // namespace boost
|
||||
</pre>
|
||||
<h4><a name="class-thread-ctors"></a>Class <code>thread</code> constructors and
|
||||
destructor</h4>
|
||||
<pre>thread();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> Constructs a <code>thread</code> object representing the
|
||||
current thread of execution.</dt>
|
||||
<dt><b>Postconditions:</b> <code>*this</code> is non-joinable.</dt>
|
||||
<dt><b>Danger:</b> <code>*this</code> is valid only within the current thread.</dt>
|
||||
</dl>
|
||||
<pre>thread(const <a href="../../function/index.html">boost::function0</a><void>& threadfunc);
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> Starts a new thread of execution and constructs a <code>thread</code>
|
||||
object representing it. Copies <code> threadfunc</code> (which in turn copies
|
||||
the function object wrapped by <code>threadfunc</code>) to an internal location
|
||||
which persists for the lifetime of the new thread of execution. Calls <code>operator()</code>
|
||||
on the copy of the <code>threadfunc</code> function object in the new thread
|
||||
of execution.</dt>
|
||||
<dt><b>Postconditions:</b> <code>*this</code> is joinable.</dt>
|
||||
<dt><b>Throws:</b> <code>boost::thread_resource_error</code> if a new thread
|
||||
of execution cannot be started.</dt>
|
||||
</dl>
|
||||
<pre>~Thread();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> Destroys <code>*this</code>. The actual thread of execution
|
||||
may continue to execute after the <code>thread</code> object has been destroyed.</dt>
|
||||
<dt><b>Note:</b> If <code>*this</code> is joinable the actual thread of execution
|
||||
becomes "detached". Any resources used by the thread will be reclaimed
|
||||
when the thread of execution completes. To ensure such a thread of execution
|
||||
runs to completion before the <code> thread</code> object is destroyed, call
|
||||
<code>join()</code>.</dt>
|
||||
</dl>
|
||||
<h4><a name="class-thread-comparisons"></a>Class <code>thread</code> comparison
|
||||
functions</h4>
|
||||
<pre>bool operator==(const thread& rhs) const;
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> The thread is non-terminated or <code>*this</code> is joinable.</dt>
|
||||
<dt><b>Returns:</b> <code>true</code> if <code>*this</code> and <code> rhs</code>
|
||||
represent the same thread of execution.</dt>
|
||||
</dl>
|
||||
<pre>bool operator!=(const thread& rhs) const;
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> The thread is non-terminated or <code>*this</code> is joinable.</dt>
|
||||
<dt><b>Returns:</b> <code>!(*this==rhs)</code>.</dt>
|
||||
</dl>
|
||||
<h4><a name="class-thread-modifiers"></a>Class <code>thread</code> modifier functions</h4>
|
||||
<pre>void join();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>*this</code> is joinable.</dt>
|
||||
<dt><b>Effects:</b> The current thread of execution blocks until the initial
|
||||
function of the thread of execution represented by <code> *this</code> finishes
|
||||
and all resources are reclaimed.</dt>
|
||||
<dt><b>Postconditions:</b> <code>*this</code> is non-joinable.</dt>
|
||||
<dt><b>Notes:</b> If <code>*this == thread()</code> the result is implementation
|
||||
defined. If the implementation doesn't detect this the result will be
|
||||
<a href="definitions.html#Deadlock"> deadlock</a>.</dt>
|
||||
</dl>
|
||||
<h4><a name="class-thread-statics"></a>Class <code>thread</code> static functions</h4>
|
||||
<pre>static void sleep(const <a href="xtime.html">xtime</a>& XT);
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> The current thread of execution blocks until <code> XT</code>
|
||||
is reached.</dt>
|
||||
</dl>
|
||||
<pre>static void yield();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> The current thread of execution is placed in the "ready"
|
||||
state.</dt>
|
||||
<dt><b>Notes:</b> Allow the current thread to give up the rest of its time slice
|
||||
(or other scheduling quota) to another thread. Particularly useful in non-preemptive
|
||||
implementations.</dt>
|
||||
</dl>
|
||||
<h3><a name="class-thread_group"></a>Class <code>thread_group</code></h3>
|
||||
<p>The <tt>thread_group</tt> class provides a container for easy grouping of threads
|
||||
to simplify several common thread creation and management idioms.</p>
|
||||
<p>All <tt>thread_group</tt> member functions are <a href=
|
||||
"definitions.html#thread-safe">thread-safe</a>, except destruction.</p>
|
||||
<h4><a name="class-thread_group-synopsis"></a>Class <code>thread_group</code>
|
||||
synopsis</h4>
|
||||
<pre>namespace boost {
|
||||
class thread_group : <a href=
|
||||
"../../utility/utility.htm#Class_noncopyable">boost::noncopyable</a>
|
||||
{
|
||||
public:
|
||||
thread_group();
|
||||
~thread_group();
|
||||
|
||||
thread* create_thread(const boost::function0<void>& threadfunc);
|
||||
void add_thread(thread* thrd);
|
||||
void remove_thread(thread* thrd);
|
||||
void join_all();
|
||||
};
|
||||
} // namespace boost
|
||||
</pre>
|
||||
<h4><a name="class-thread_group-ctors"></a>Class <code>thread_group</code> constructors
|
||||
and destructor</h4>
|
||||
<pre>thread_group();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> Constructs an empty <code>thread_group</code> container.</dt>
|
||||
</dl>
|
||||
<pre>~thread_group();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> Destroys each contained thread object. Destroys <code>*this</code>.</dt>
|
||||
<dt><b>Notes:</b> Behavior is undefined if another thread references *this during
|
||||
the execution of the destructor.</dt>
|
||||
</dl>
|
||||
<h4><a name="class-thread_group-modifiers"></a>Class <code>thread_group</code>
|
||||
modifier functions</h4>
|
||||
<pre>thread* create_thread(const boost::function0<void>& threadfunc);
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> Creates a new <tt>thread</tt> object that executes <tt>threadfunc</tt>
|
||||
and adds it to the <tt>thread_group</tt> container object's list of managed
|
||||
<tt>thread</tt> objects.</dt>
|
||||
<dt><b>Returns:</b> Pointer to the newly created thread.</dt>
|
||||
</dl>
|
||||
<pre>void add_thread(thread* thrd);
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> Adds <tt>thrd</tt> to the <tt>thread_group</tt> object's
|
||||
list of managed <tt>thread</tt> objects. The <tt>thrd</tt> object must have
|
||||
been allocated via operator new and will be deleted when the group is destroyed.</dt>
|
||||
</dl>
|
||||
<pre>Void remove_thread(thread* thrd);
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> Removes <code>*this</code>'s list of managed <tt>thread</tt>
|
||||
objects.</dt>
|
||||
<dt><b>Throws:</b> ? if <tt>thrd</tt> is not it <code>*this</code>'s list
|
||||
of managed <tt>thread</tt> objects.</dt>
|
||||
</dl>
|
||||
<pre>Void join_all();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> Calls <code>join()</code> on each of the managed <tt>thread</tt>
|
||||
objects.</dt>
|
||||
</dl>
|
||||
<h2><a name="functions"></a>Functions</h2>
|
||||
<pre><a name="function-spec"></a>{{function}}
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> {{text}}</dt>
|
||||
<dt><b>Effects:</b> {{text}}</dt>
|
||||
<dt><b>Postconditions:</b> {{text}}</dt>
|
||||
<dt><b>Returns:</b> {{text}}</dt>
|
||||
<dt><b>Throws:</b> {{text}}</dt>
|
||||
<dt><b>Complexity:</b> {{text}}</dt>
|
||||
<dt><b>Rationale:</b> {{text}}</dt>
|
||||
</dl>
|
||||
<h2><a name="objects"></a>Objects</h2>
|
||||
<p><a name="object-spec"></a>{{Object specifications}}</p>
|
||||
<h2><a name="examples"></a>Example(s)</h2>
|
||||
<h3><a name="example-thread"></a>Simple usage of <code>boost::thread</code></h3>
|
||||
<p><a href="../example/thread.cpp">libs/thread/example/thread.cpp</a></p>
|
||||
<p>The output is:</p>
|
||||
<pre>setting alarm for 5 seconds...
|
||||
alarm sounded...
|
||||
</pre>
|
||||
<h3><a name="example-thread_group"></a>Simple usage of <code>boost::thread_group</code></h3>
|
||||
<p><a href="../example/thread_group.cpp">libs/thread/example/thread_group.cpp</a></p>
|
||||
<p>The output is:</p>
|
||||
<pre>count = 1
|
||||
count = 2
|
||||
count = 3
|
||||
count = 4
|
||||
count = 5
|
||||
count = 6
|
||||
count = 7
|
||||
count = 8
|
||||
count = 9
|
||||
count = 10
|
||||
</pre>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->09 January, 2003<!--webbot bot="Timestamp" endspan i-checksum="38582" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
49
doc/thread.xml
Normal file
49
doc/thread.xml
Normal file
@@ -0,0 +1,49 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<library name="Threads" dirname="thread" id="threads"
|
||||
last-revision="$Date$"
|
||||
xmlns:xi="http://www.w3.org/2001/XInclude">
|
||||
<libraryinfo>
|
||||
<author>
|
||||
<firstname>William</firstname>
|
||||
<othername>E.</othername>
|
||||
<surname>Kempf</surname>
|
||||
</author>
|
||||
<copyright>
|
||||
<year>2001</year>
|
||||
<year>2002</year>
|
||||
<year>2003</year>
|
||||
<holder>William E. Kempf</holder>
|
||||
</copyright>
|
||||
<legalnotice>
|
||||
<para>Permission to use, copy, modify, distribute and sell this
|
||||
software and its documentation for any purpose is hereby granted
|
||||
without fee, provided that the above copyright notice appear in all
|
||||
copies and that both that copyright notice and this permission notice
|
||||
appear in supporting documentation. William E. Kempf makes no
|
||||
representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</para>
|
||||
</legalnotice>
|
||||
<librarypurpose>Portable C++ multi-threading</librarypurpose>
|
||||
<librarycategory name="category:concurrent" />
|
||||
<title>Boost.Threads</title>
|
||||
</libraryinfo>
|
||||
<title>Boost.Threads</title>
|
||||
<xi:include href="overview.xml"/>
|
||||
<xi:include href="design.xml"/>
|
||||
<xi:include href="concepts.xml"/>
|
||||
<xi:include href="rationale.xml"/>
|
||||
<xi:include href="reference.xml"/>
|
||||
<xi:include href="faq.xml"/>
|
||||
<xi:include href="configuration.xml"/>
|
||||
<xi:include href="build.xml"/>
|
||||
<xi:include href="implementation_notes.xml"/>
|
||||
<xi:include href="release_notes.xml"/>
|
||||
<xi:include href="glossary.xml"/>
|
||||
<xi:include href="acknowledgements.xml"/>
|
||||
<xi:include href="bibliography.xml"/>
|
||||
</library>
|
||||
202
doc/tss-ref.xml
Normal file
202
doc/tss-ref.xml
Normal file
@@ -0,0 +1,202 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<header name="boost/thread/tss.hpp"
|
||||
last-revision="$Date$">
|
||||
<namespace name="boost">
|
||||
<class name="thread_specific_ptr">
|
||||
<purpose>
|
||||
The <classname>thread_specific_ptr</classname> class defines
|
||||
an interface for using thread specific storage.
|
||||
</purpose>
|
||||
|
||||
<description>
|
||||
<para>Thread specific storage is data associated with
|
||||
individual threads and is often used to make operations
|
||||
that rely on global data
|
||||
<link linkend="threads.glossary.thread-safe">thread-safe</link>.
|
||||
</para>
|
||||
|
||||
<para>Template <classname>thread_specific_ptr</classname>
|
||||
stores a pointer to an object obtained on a thread-by-thread
|
||||
basis and calls a specified cleanup handler on the contained
|
||||
pointer when the thread terminates. The cleanup handlers are
|
||||
called in the reverse order of construction of the
|
||||
<classname>thread_specific_ptr</classname>s, and for the
|
||||
initial thread are called by the destructor, providing the
|
||||
same ordering guarantees as for normal declarations. Each
|
||||
thread initially stores the null pointer in each
|
||||
<classname>thread_specific_ptr</classname> instance.</para>
|
||||
|
||||
<para>The template <classname>thread_specific_ptr</classname>
|
||||
is useful in the following cases:
|
||||
<itemizedlist>
|
||||
<listitem>An interface was originally written assuming
|
||||
a single thread of control and it is being ported to a
|
||||
multithreaded environment.</listitem>
|
||||
|
||||
<listitem>Each thread of control invokes sequences of
|
||||
methods that share data that are physically unique
|
||||
for each thread, but must be logically accessed
|
||||
through a globally visible access point instead of
|
||||
being explicitly passed.</listitem>
|
||||
</itemizedlist>
|
||||
</para>
|
||||
</description>
|
||||
|
||||
<inherit access="private">
|
||||
<type><classname>boost::noncopyable</classname></type>
|
||||
<purpose>Exposition only</purpose>
|
||||
</inherit>
|
||||
|
||||
<constructor>
|
||||
<requires>The expression <code>delete get()</code> is well
|
||||
formed.</requires>
|
||||
|
||||
<effects>A thread-specific data key is allocated and visible to
|
||||
all threads in the process. Upon creation, the value
|
||||
<code>NULL</code> will be associated with the new key in all
|
||||
active threads. A cleanup method is registered with the key
|
||||
that will call <code>delete</code> on the value associated
|
||||
with the key for a thread when it exits. When a thread exits,
|
||||
if a key has a registered cleanup method and the thread has a
|
||||
non-<code>NULL</code> value associated with that key, the value
|
||||
of the key is set to <code>NULL</code> and then the cleanup
|
||||
method is called with the previously associated value as its
|
||||
sole argument. The order in which registered cleanup methods
|
||||
are called when a thread exits is undefined. If after all the
|
||||
cleanup methods have been called for all non-<code>NULL</code>
|
||||
values, there are still some non-<code>NULL</code> values
|
||||
with associated cleanup handlers the result is undefined
|
||||
behavior.</effects>
|
||||
|
||||
<throws><classname>boost::thread_resource_error</classname> if
|
||||
the necessary resources can not be obtained.</throws>
|
||||
|
||||
<notes>There may be an implementation specific limit to the
|
||||
number of thread specific storage objects that can be created,
|
||||
and this limit may be small.</notes>
|
||||
|
||||
<rationale>The most common need for cleanup will be to call
|
||||
<code>delete</code> on the associated value. If other forms
|
||||
of cleanup are required the overloaded constructor should be
|
||||
called instead.</rationale>
|
||||
</constructor>
|
||||
|
||||
<constructor>
|
||||
<parameter name="cleanup">
|
||||
<paramtype>void (*cleanup)(void*)</paramtype>
|
||||
</parameter>
|
||||
|
||||
<effects>A thread-specific data key is allocated and visible to
|
||||
all threads in the process. Upon creation, the value
|
||||
<code>NULL</code> will be associated with the new key in all
|
||||
active threads. The <code>cleanup</code> method is registered
|
||||
with the key and will be called for a thread with the value
|
||||
associated with the key for that thread when it exits. When a
|
||||
thread exits, if a key has a registered cleanup method and the
|
||||
thread has a non-<code>NULL</code> value associated with that
|
||||
key, the value of the key is set to <code>NULL</code> and then
|
||||
the cleanup method is called with the previously associated
|
||||
value as its sole argument. The order in which registered
|
||||
cleanup methods are called when a thread exits is undefined.
|
||||
If after all the cleanup methods have been called for all
|
||||
non-<code>NULL</code> values, there are still some
|
||||
non-<code>NULL</code> values with associated cleanup handlers
|
||||
the result is undefined behavior.</effects>
|
||||
|
||||
<throws><classname>boost::thread_resource_error</classname> if
|
||||
the necessary resources can not be obtained.</throws>
|
||||
|
||||
<notes>There may be an implementation specific limit to the
|
||||
number of thread specific storage objects that can be created,
|
||||
and this limit may be small.</notes>
|
||||
|
||||
<rationale>There is the occasional need to register
|
||||
specialized cleanup methods, or to register no cleanup method
|
||||
at all (done by passing <code>NULL</code> to this constructor.
|
||||
</rationale>
|
||||
</constructor>
|
||||
|
||||
<destructor>
|
||||
<effects>Deletes the thread-specific data key allocated by the
|
||||
constructor. The thread-specific data values associated with
|
||||
the key need not be <code>NULL</code>. It is the responsibility
|
||||
of the application to perform any cleanup actions for data
|
||||
associated with the key.</effects>
|
||||
|
||||
<notes>Does not destroy any data that may be stored in any
|
||||
thread's thread specific storage. For this reason you should
|
||||
not destroy a <classname>thread_specific_ptr</classname> object
|
||||
until you are certain there are no threads running that have
|
||||
made use of its thread specific storage.</notes>
|
||||
|
||||
<rationale>Associated data is not cleaned up because registered
|
||||
cleanup methods need to be run in the thread that allocated the
|
||||
associated data to be guarranteed to work correctly. There's no
|
||||
safe way to inject the call into another thread's execution
|
||||
path, making it impossible to call the cleanup methods safely.
|
||||
</rationale>
|
||||
</destructor>
|
||||
|
||||
<method-group name="modifier functions">
|
||||
<method name="release">
|
||||
<type>T*</type>
|
||||
|
||||
<postconditions><code>*this</code> holds the null pointer
|
||||
for the current thread.</postconditions>
|
||||
|
||||
<returns><code>this->get()</code> prior to the call.</returns>
|
||||
|
||||
<rationale>This method provides a mechanism for the user to
|
||||
relinquish control of the data associated with the
|
||||
thread-specific key.</rationale>
|
||||
</method>
|
||||
|
||||
<method name="reset">
|
||||
<type>void</type>
|
||||
|
||||
<parameter name="p">
|
||||
<paramtype>T*</paramtype>
|
||||
<default>0</default>
|
||||
</parameter>
|
||||
|
||||
<effects>If <code>this->get() != p &&
|
||||
this->get() != NULL</code> then call the
|
||||
associated cleanup function.</effects>
|
||||
|
||||
<postconditions><code>*this</code> holds the pointer
|
||||
<code>p</code> for the current thread.</postconditions>
|
||||
</method>
|
||||
</method-group>
|
||||
|
||||
<method-group name="observer functions">
|
||||
<method name="get" cv="const">
|
||||
<type>T*</type>
|
||||
|
||||
<returns>The object stored in thread specific storage for
|
||||
the current thread for <code>*this</code>.</returns>
|
||||
|
||||
<notes>Each thread initially returns 0.</notes>
|
||||
</method>
|
||||
|
||||
<method name="operator->" cv="const">
|
||||
<type>T*</type>
|
||||
|
||||
<returns><code>this->get()</code>.</returns>
|
||||
</method>
|
||||
|
||||
<method name="operator*()" cv="const">
|
||||
<type>T&</type>
|
||||
|
||||
<requires><code>this->get() != 0</code></requires>
|
||||
|
||||
<returns><code>this->get()</code>.</returns>
|
||||
</method>
|
||||
</method-group>
|
||||
</class>
|
||||
</namespace>
|
||||
</header>
|
||||
169
doc/tss.html
169
doc/tss.html
@@ -1,169 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - Header <boost/thread/tss.hpp></title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Header <<a href="../../../boost/thread/tss.hpp">boost/thread/tss.hpp</a>></h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<h2>Contents</h2>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#classes">Classes</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-thread_specific_ptr">Class <code>thread_specific_ptr</code></a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-thread_specific_ptr-synopsis">Class <code>thread_specific_ptr</code>
|
||||
synopsis</a></dt>
|
||||
<dt><a href="#class-thread_specific_ptr-ctors">Class <code>thread_specific_ptr</code>
|
||||
constructors and destructor</a></dt>
|
||||
<dt><a href="#class-thread_specific_ptr-modifiers">Class <code>thread_specific_ptr</code>
|
||||
modifier functions</a></dt>
|
||||
<dt><a href="#class-thread_specific_ptr-observers">Class <code>thread_specific_ptr</code>
|
||||
observer functions</a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
<dt><a href="#examples">Example(s)</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p>The header <<a href="../../../boost/thread/tss.hpp">boost/thread/tss.hpp</a>>
|
||||
defines the class <a href="#class-thread_specific_ptr">thread_specific_ptr</a>
|
||||
which is used to manage data associated with specific thread instances.</p>
|
||||
<h2><a name="classes"></a>Classes</h2>
|
||||
<h3><a name="class-thread_specific_ptr"></a>Class <code>thread_specific_ptr</code></h3>
|
||||
<p>The <code>thread_specific_ptr</code> class defines an interface for using thread
|
||||
specific storage. Thread specific storage is data associated with individual
|
||||
threads and is often used to make operations <a href="definitions.html#Thread-safe">thread-safe</a>
|
||||
that rely on global data.</p>
|
||||
<p>Template <code>thread_specific_ptr</code> stores a pointer to an object obtained
|
||||
via <code>new</code> on a thread-by-thread basis and calls delete on the contained
|
||||
pointer when the thread terminates. Each thread initially stores the null pointer
|
||||
in each <code> thread_specific_ptr</code> instance.</p>
|
||||
<p>The template <code>thread_specific_ptr</code> is useful in the following cases:</p>
|
||||
<ul>
|
||||
<li>An interface was originally written assuming a single thread of control
|
||||
and is being ported to a multithreaded environment.</li>
|
||||
<li>Each thread of control invokes sequences of methods that share data that
|
||||
must be logically accessed through a globally visible access point, but are
|
||||
physically unique for each thread, instead of being explicitly passed.</li>
|
||||
</ul>
|
||||
<h4><a name="class-thread_specific_ptr-synopsis"></a>Class <code>thread_specific_ptr</code>
|
||||
synopsis</h4>
|
||||
<pre>
|
||||
namespace boost
|
||||
{
|
||||
template <typename T>
|
||||
class thread_specific_ptr : private boost::noncopyable // Exposition only.
|
||||
// Class thread_specific_ptr meets the <a href="overview.html#non-copyable">NonCopyable</a> requirement.
|
||||
{
|
||||
public:
|
||||
thread_specific_ptr();
|
||||
~thread_specific_ptr();
|
||||
|
||||
T* get() const;
|
||||
T* operator->() const;
|
||||
T& operator*() const;
|
||||
T* release();
|
||||
void reset(T* p=0);
|
||||
};
|
||||
};
|
||||
</pre>
|
||||
<h4><a name="class-thread_specific_ptr-ctors"></a>Class <code>thread_specific_ptr</code>
|
||||
constructors and destructor</h4>
|
||||
<pre>
|
||||
thread_specific_ptr();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> The expression <code>delete get()</code> is well formed.</dt>
|
||||
<dt><b>Postconditions:</b> A thread specific storage has been reserved for use
|
||||
by <code>*this</code> in all threads, with each thread initially storing a
|
||||
null pointer.</dt>
|
||||
<dt><b>Throws:</b> <code>boost::thread_resource_error</code> if the necessary
|
||||
resources can not be obtained.</dt>
|
||||
<dt><b>Note:</b> There is an implementation specific limit to the number of
|
||||
thread specific storage objects that can be created, and this limit may be
|
||||
small.</dt>
|
||||
</dl>
|
||||
<pre>
|
||||
~thread_specific_ptr();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Note:</b> Does not destroy any data that may be stored in any thread's
|
||||
thread specific storage. For this reason you should not destroy a <code>thread_specific_ptr</code>
|
||||
object until you are certain there are no threads running that have made use
|
||||
of its thread specific storage.</dt>
|
||||
</dl>
|
||||
<h4><a name="class-thread_specific_ptr-modifiers"></a>Class <code>thread_specific_ptr</code>
|
||||
modifier functions</h4>
|
||||
<pre>
|
||||
T* release();
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Postconditions:</b> <code>*this</code> holds the null pointer for the
|
||||
current thread.</dt>
|
||||
<dt><b>Returns:</b> <code>this->get()</code> prior to the call.</dt>
|
||||
</dl>
|
||||
<pre>
|
||||
void reset(T* p=0);
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Effects:</b> If <code>this->get()!= p</code> then <code>delete this->get()</code>.
|
||||
</dt>
|
||||
<dt><b>Postconditions:</b> <code>*this</code> holds the pointer <code> p</code>
|
||||
for the current thread.</dt>
|
||||
<dt><b>Note:</b> The pointer will be deleted when the thread terminates.</dt>
|
||||
</dl>
|
||||
<h4><a name="class-thread_specific_ptr-observers"></a>Class <code>thread_specific_ptr</code>
|
||||
observer functions</h4>
|
||||
<pre>
|
||||
T* get() const;
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Returns:</b> The object stored in thread specific storage for the current
|
||||
thread for <code>*this</code>.</dt>
|
||||
<dt><b>Note:</b> Each thread initially returns 0.</dt>
|
||||
</dl>
|
||||
<pre>
|
||||
T* operator->() const;
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Returns:</b> <code>this-<get()</code>.</dt>
|
||||
</dl>
|
||||
<pre>
|
||||
T& operator*() const;
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>this-<get() != 0</code></dt>
|
||||
<dt><b>Returns:</b> <code>this-<get()</code>.</dt>
|
||||
</dl>
|
||||
<h2><a name="examples"></a>Example(s)</h2>
|
||||
<p><a href="../example/tss.cpp">libs/thread/example/tss.cpp</a></p>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2001
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
78
doc/xtime-ref.xml
Normal file
78
doc/xtime-ref.xml
Normal file
@@ -0,0 +1,78 @@
|
||||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
|
||||
"http://www.boost.org/tools/boostbook/dtd/boostbook.dtd" [
|
||||
<!ENTITY % threads.entities SYSTEM "entities.xml">
|
||||
%threads.entities;
|
||||
]>
|
||||
<header name="boost/thread/xtime.hpp"
|
||||
last-revision="$Date$">
|
||||
<namespace name="boost">
|
||||
<enum name="xtime_clock_types">
|
||||
<enumvalue name="TIME_UTC" />
|
||||
|
||||
<purpose>
|
||||
<para>Specifies the clock type to use when creating
|
||||
an object of type <classname>xtime</classname>.</para>
|
||||
</purpose>
|
||||
|
||||
<description>
|
||||
<para>The only clock type supported by &Boost.Threads; is
|
||||
<code>TIME_UTC</code>. The epoch for <code>TIME_UTC</code>
|
||||
is 1970-01-01 00:00:00.</para>
|
||||
</description>
|
||||
</enum>
|
||||
|
||||
<struct name="xtime">
|
||||
<purpose>
|
||||
<simpara>An object of type <classname>xtime</classname>
|
||||
defines a time that is used to perform high-resolution time operations.
|
||||
This is a temporary solution that will be replaced by a more robust time
|
||||
library once available in Boost.</simpara>
|
||||
</purpose>
|
||||
|
||||
<description>
|
||||
<simpara>The <classname>xtime</classname> type is used to represent a point on
|
||||
some time scale or a duration in time. This type may be proposed for the C standard by
|
||||
Markus Kuhn. &Boost.Threads; provides only a very minimal implementation of this
|
||||
proposal; it is expected that a full implementation (or some other time
|
||||
library) will be provided in Boost as a separate library, at which time &Boost.Threads;
|
||||
will deprecate its own implementation.</simpara>
|
||||
|
||||
<simpara><emphasis role="bold">Note</emphasis> that the resolution is
|
||||
implementation specific. For many implementations the best resolution
|
||||
of time is far more than one nanosecond, and even when the resolution
|
||||
is reasonably good, the latency of a call to <code>xtime_get()</code>
|
||||
may be significant. For maximum portability, avoid durations of less than
|
||||
one second.</simpara>
|
||||
</description>
|
||||
|
||||
<free-function-group name="creation">
|
||||
<function name="xtime_get">
|
||||
<type>int</type>
|
||||
|
||||
<parameter name="xtp">
|
||||
<paramtype><classname>xtime</classname>*</paramtype>
|
||||
</parameter>
|
||||
|
||||
<parameter name="clock_type">
|
||||
<paramtype>int</paramtype>
|
||||
</parameter>
|
||||
|
||||
<postconditions>
|
||||
<simpara><code>xtp</code> represents the current point in
|
||||
time as a duration since the epoch specified by
|
||||
<code>clock_type</code>.</simpara>
|
||||
</postconditions>
|
||||
|
||||
<returns>
|
||||
<simpara><code>clock_type</code> if successful, otherwise 0.</simpara>
|
||||
</returns>
|
||||
</function>
|
||||
</free-function-group>
|
||||
|
||||
<data-member name="sec">
|
||||
<type><emphasis>platform-specific-type</emphasis></type>
|
||||
</data-member>
|
||||
</struct>
|
||||
</namespace>
|
||||
</header>
|
||||
110
doc/xtime.html
110
doc/xtime.html
@@ -1,110 +0,0 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Threads - Header <boost/thread/xtime.hpp></title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Threads</h1>
|
||||
<h2 align="center">Header <<a href="../../../boost/thread/xtime.hpp">boost/thread/xtime.hpp</a>></h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<h2>Contents</h2>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#values">Values</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#value-spec">TIME_UTC</a></dt>
|
||||
</dl>
|
||||
<dt><a href="#classes">Classes</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-spec">Struct <code>xtime</code></a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#class-xtime-synopsis">Struct <code>xtime</code> synopsis</a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
<dt><a href="#functions">Functions</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#function-xtime_get"><code>xtime_get</code></a></dt>
|
||||
</dl>
|
||||
<dt><a href="#examples">Example(s)</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p>The header <<a href="../../../boost/thread/xtime.hpp">boost/thread/xtime.hpp</a>>
|
||||
defines functions and data types used to perform high-resolution time operations.
|
||||
This is a temporary solution that will be replaced by a more robust time library
|
||||
once available in Boost.</p>
|
||||
<h2><a name="values"></a>Values</h2>
|
||||
<pre><a name="value-spec"></a>
|
||||
enum
|
||||
{
|
||||
TIME_UTC
|
||||
}
|
||||
</pre>
|
||||
<p>The clock type for Coordinated Universal Time (UTC). The epoch for this clock
|
||||
type is 1970-01-01 00:00:00. This is the only clock type supported by <b>Boost.Threads</b>.</p>
|
||||
<h2><a name="classes"></a>Classes</h2>
|
||||
<h3><a name="class-xtime"></a>Struct <code>xtime</code></h3>
|
||||
<p>The <code>xtime</code> type is used to represent a point on some time scale
|
||||
or a duration in time. This type may be proposed for the C standard by Markus
|
||||
Kuhn. <b>Boost.Threads</b> provides only a very minimal implementation of this
|
||||
proposal and it's expected that a full implementation (or some other time
|
||||
library) will be provided in Boost as a separate library, at which time <b>Boost.Threads</b>
|
||||
will deprecate its implementation.</p>
|
||||
<h4><a name="class-xtime-synopsis"></a>Struct <code>xtime</code> synopsis</h4>
|
||||
<pre>
|
||||
namespace boost
|
||||
{
|
||||
struct xtime
|
||||
{
|
||||
#if defined(BOOST_NO_INT64_T)
|
||||
int_fast32_t sec;
|
||||
#else
|
||||
int_fast64_t sec;
|
||||
#endif
|
||||
int_fast32_t nsec;
|
||||
};
|
||||
};
|
||||
</pre>
|
||||
<h2><a name="functions"></a>Functions</h2>
|
||||
<pre>
|
||||
<a name="function-xtime_get"></a>int xtime_get(struct xtime* xtp, int clock_type);
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Postconditions:</b> <code>xtp</code> represents the current point in
|
||||
time as a duration since the epoch specified by the <code> clock_type</code>.</dt>
|
||||
<dt><b>Returns:</b> <code>clock_type</code> if successful, otherwise 0.</dt>
|
||||
<dt><b>Note:</b> The resolution is implementation specific. For many implementations
|
||||
the best resolution of time is far more than one nanosecond, and even when
|
||||
the resolution is reasonably good, the latency of a call to <code>xtime_get()</code>
|
||||
may be significant. For maximum portability, avoid durations of less than
|
||||
one second.</dt>
|
||||
</dl>
|
||||
<h2><a name="examples"></a>Example(s)</h2>
|
||||
<p><a href="../example/xtime.cpp">libs/thread/example/xtime.cpp</a></p>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2001
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="mailto:wekempf@cox.net">William E. Kempf</a> 2001-2002.
|
||||
All Rights Reserved.</i></p>
|
||||
<p>Permission to use, copy, modify, distribute and sell this software and its
|
||||
documentation for any purpose is hereby granted without fee, provided that the
|
||||
above copyright notice appear in all copies and that both that copyright notice
|
||||
and this permission notice appear in supporting documentation. William E. Kempf
|
||||
makes no representations about the suitability of this software for any purpose.
|
||||
It is provided "as is" without express or implied warranty.</p>
|
||||
</body>
|
||||
</html>
|
||||
@@ -1,2 +1,2 @@
|
||||
bin
|
||||
*.pdb
|
||||
*.pdb
|
||||
|
||||
@@ -1,7 +1,25 @@
|
||||
# (C) Copyright William E. Kempf 2001. Permission to copy, use, modify, sell and
|
||||
# distribute this software is granted provided this copyright notice appears
|
||||
# in all copies. This software is provided "as is" without express or implied
|
||||
# warranty, and with no claim as to its suitability for any purpose.
|
||||
# Copyright (C) 2001-2003
|
||||
# William E. Kempf
|
||||
#
|
||||
# Permission to use, copy, modify, distribute and sell this software
|
||||
# and its documentation for any purpose is hereby granted without fee,
|
||||
# provided that the above copyright notice appear in all copies and
|
||||
# that both that copyright notice and this permission notice appear
|
||||
# in supporting documentation. William E. Kempf makes no representations
|
||||
# about the suitability of this software for any purpose.
|
||||
# It is provided "as is" without express or implied warranty.
|
||||
#
|
||||
# Boost.Threads example Jamfile
|
||||
#
|
||||
# Additional configuration variables used:
|
||||
# 1. PTW32 may be used on Win32 platforms to specify that the pthreads-win32
|
||||
# library should be used instead of "native" threads. This feature is
|
||||
# mostly used for testing and it's generally recommended you use the
|
||||
# native threading libraries instead. PTW32 should be set to be a list
|
||||
# of two strings, the first specifying the installation path of the
|
||||
# pthreads-win32 library and the second specifying which library
|
||||
# variant to link against (see the pthreads-win32 documentation).
|
||||
# Example: jam -sPTW32="c:\pthreads-win32 pthreadVCE.lib"
|
||||
|
||||
# Declare the location of this subproject relative to the root.
|
||||
subproject libs/thread/example ;
|
||||
@@ -9,28 +27,28 @@ subproject libs/thread/example ;
|
||||
# Include threads.jam for Boost.Threads global build information.
|
||||
# This greatly simplifies the Jam code needed to configure the build
|
||||
# for the various Win32 build types.
|
||||
SEARCH on <module@>threads.jam = $(BOOST_ROOT)/libs/thread/build ;
|
||||
include <module@>threads.jam ;
|
||||
import ../build/threads ;
|
||||
|
||||
template example
|
||||
## sources ##
|
||||
: <template>thread_base
|
||||
<dll>../build/boost_thread
|
||||
$(threadmon)
|
||||
## requirements ##
|
||||
:
|
||||
## default build ##
|
||||
: release <runtime-link>dynamic
|
||||
;
|
||||
{
|
||||
template example
|
||||
## sources ##
|
||||
: <template>thread_base
|
||||
<dll>../build/boost_thread
|
||||
## requirements ##
|
||||
:
|
||||
## default build ##
|
||||
:
|
||||
;
|
||||
|
||||
exe monitor : <template>example monitor.cpp ;
|
||||
exe starvephil : <template>example starvephil.cpp ;
|
||||
exe tennis : <template>example tennis.cpp ;
|
||||
exe condition : <template>example condition.cpp ;
|
||||
exe mutex : <template>example mutex.cpp ;
|
||||
exe once : <template>example once.cpp ;
|
||||
exe recursive_mutex : <template>example recursive_mutex.cpp ;
|
||||
exe thread : <template>example thread.cpp ;
|
||||
exe thread_group : <template>example thread_group.cpp ;
|
||||
exe tss : <template>example tss.cpp ;
|
||||
exe xtime : <template>example xtime.cpp ;
|
||||
exe monitor : <template>example monitor.cpp ;
|
||||
exe starvephil : <template>example starvephil.cpp ;
|
||||
exe tennis : <template>example tennis.cpp ;
|
||||
exe condition : <template>example condition.cpp ;
|
||||
exe mutex : <template>example mutex.cpp ;
|
||||
exe once : <template>example once.cpp ;
|
||||
exe recursive_mutex : <template>example recursive_mutex.cpp ;
|
||||
exe thread : <template>example thread.cpp ;
|
||||
exe thread_group : <template>example thread_group.cpp ;
|
||||
exe tss : <template>example tss.cpp ;
|
||||
exe xtime : <template>example xtime.cpp ;
|
||||
}
|
||||
|
||||
@@ -1,3 +1,14 @@
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. William E. Kempf makes no representations
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#include <iostream>
|
||||
#include <vector>
|
||||
#include <boost/utility.hpp>
|
||||
@@ -43,9 +54,9 @@ bounded_buffer buf(2);
|
||||
void sender() {
|
||||
int n = 0;
|
||||
while (n < 100) {
|
||||
buf.send(n);
|
||||
std::cout << "sent: " << n << std::endl;
|
||||
++n;
|
||||
buf.send(n);
|
||||
std::cout << "sent: " << n << std::endl;
|
||||
++n;
|
||||
}
|
||||
buf.send(-1);
|
||||
}
|
||||
@@ -53,8 +64,8 @@ void sender() {
|
||||
void receiver() {
|
||||
int n;
|
||||
do {
|
||||
n = buf.receive();
|
||||
std::cout << "received: " << n << std::endl;
|
||||
n = buf.receive();
|
||||
std::cout << "received: " << n << std::endl;
|
||||
} while (n != -1); // -1 indicates end of buffer
|
||||
}
|
||||
|
||||
|
||||
@@ -1,3 +1,14 @@
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. William E. Kempf makes no representations
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#include <vector>
|
||||
#include <iostream>
|
||||
#include <boost/thread/condition.hpp>
|
||||
@@ -6,9 +17,9 @@
|
||||
#include <boost/thread/thread.hpp>
|
||||
|
||||
namespace {
|
||||
const int ITERS = 100;
|
||||
boost::mutex io_mutex;
|
||||
}
|
||||
const int ITERS = 100;
|
||||
boost::mutex io_mutex;
|
||||
} // namespace
|
||||
|
||||
template <typename M>
|
||||
class buffer_t
|
||||
|
||||
@@ -1,3 +1,14 @@
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. William E. Kempf makes no representations
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#include <boost/thread/mutex.hpp>
|
||||
#include <boost/thread/thread.hpp>
|
||||
#include <iostream>
|
||||
|
||||
@@ -1,3 +1,14 @@
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. William E. Kempf makes no representations
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#include <boost/thread/thread.hpp>
|
||||
#include <boost/thread/once.hpp>
|
||||
#include <cassert>
|
||||
@@ -12,14 +23,14 @@ void init()
|
||||
|
||||
void thread_proc()
|
||||
{
|
||||
boost::call_once(&init, once);
|
||||
boost::call_once(&init, once);
|
||||
}
|
||||
|
||||
int main(int argc, char* argv[])
|
||||
{
|
||||
boost::thread_group threads;
|
||||
for (int i=0; i<5; ++i)
|
||||
threads.create_thread(&thread_proc);
|
||||
threads.join_all();
|
||||
assert(value == 1);
|
||||
boost::thread_group threads;
|
||||
for (int i=0; i<5; ++i)
|
||||
threads.create_thread(&thread_proc);
|
||||
threads.join_all();
|
||||
assert(value == 1);
|
||||
}
|
||||
|
||||
@@ -1,3 +1,14 @@
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. William E. Kempf makes no representations
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#include <boost/thread/recursive_mutex.hpp>
|
||||
#include <boost/thread/thread.hpp>
|
||||
#include <iostream>
|
||||
|
||||
@@ -1,3 +1,14 @@
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. William E. Kempf makes no representations
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#include <boost/thread/mutex.hpp>
|
||||
#include <boost/thread/condition.hpp>
|
||||
#include <boost/thread/thread.hpp>
|
||||
@@ -7,8 +18,8 @@
|
||||
|
||||
namespace
|
||||
{
|
||||
boost::mutex iomx;
|
||||
}
|
||||
boost::mutex iomx;
|
||||
} // namespace
|
||||
|
||||
class canteen
|
||||
{
|
||||
@@ -39,8 +50,9 @@ public:
|
||||
boost::mutex::scoped_lock lock(m_mutex);
|
||||
{
|
||||
boost::mutex::scoped_lock lock(iomx);
|
||||
std::cout << "(" << clock() <<
|
||||
") Chef: ouch ... make room ... this dish is very hot ..." << std::endl;
|
||||
std::cout << "(" << clock()
|
||||
<< ") Chef: ouch ... make room ... this dish is "
|
||||
<< "very hot ..." << std::endl;
|
||||
}
|
||||
boost::xtime xt;
|
||||
boost::xtime_get(&xt, boost::TIME_UTC);
|
||||
@@ -84,7 +96,7 @@ void chef()
|
||||
{
|
||||
boost::mutex::scoped_lock lock(iomx);
|
||||
std::cout << "(" << clock() << ") Chef: " << chickens
|
||||
<< " chickens, ready-to-go ..." << std::endl;
|
||||
<< " chickens, ready-to-go ..." << std::endl;
|
||||
}
|
||||
g_canteen.put(chickens);
|
||||
}
|
||||
@@ -96,7 +108,8 @@ struct phil
|
||||
void run() {
|
||||
{
|
||||
boost::mutex::scoped_lock lock(iomx);
|
||||
std::cout << "(" << clock() << ") Phil" << m_id << ": starting ..." << std::endl;
|
||||
std::cout << "(" << clock() << ") Phil" << m_id
|
||||
<< ": starting ..." << std::endl;
|
||||
}
|
||||
for (;;)
|
||||
{
|
||||
@@ -110,13 +123,13 @@ struct phil
|
||||
{
|
||||
boost::mutex::scoped_lock lock(iomx);
|
||||
std::cout << "(" << clock() << ") Phil" << m_id
|
||||
<< ": gotta eat ..." << std::endl;
|
||||
<< ": gotta eat ..." << std::endl;
|
||||
}
|
||||
g_canteen.get(m_id);
|
||||
{
|
||||
boost::mutex::scoped_lock lock(iomx);
|
||||
std::cout << "(" << clock() << ") Phil" << m_id
|
||||
<< ": mmm ... that's good ..." << std::endl;
|
||||
<< ": mmm ... that's good ..." << std::endl;
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -129,7 +142,10 @@ struct phil
|
||||
|
||||
struct thread_adapt
|
||||
{
|
||||
thread_adapt(void (*func)(void*), void* param) : _func(func), _param(param) { }
|
||||
thread_adapt(void (*func)(void*), void* param)
|
||||
: _func(func), _param(param)
|
||||
{
|
||||
}
|
||||
int operator()() const
|
||||
{
|
||||
_func(_param);
|
||||
@@ -143,7 +159,10 @@ struct thread_adapt
|
||||
class thread_adapter
|
||||
{
|
||||
public:
|
||||
thread_adapter(void (*func)(void*), void* param) : _func(func), _param(param) { }
|
||||
thread_adapter(void (*func)(void*), void* param)
|
||||
: _func(func), _param(param)
|
||||
{
|
||||
}
|
||||
void operator()() const { _func(_param); }
|
||||
private:
|
||||
void (*_func)(void*);
|
||||
|
||||
@@ -1,3 +1,14 @@
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. William E. Kempf makes no representations
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#include <boost/thread/mutex.hpp>
|
||||
#include <boost/thread/condition.hpp>
|
||||
#include <boost/thread/thread.hpp>
|
||||
@@ -49,7 +60,10 @@ void player(void* param)
|
||||
{
|
||||
cond.wait(lock);
|
||||
if (state == other)
|
||||
std::cout << "---" << player_name(active) << ": Spurious wakeup!" << std::endl;
|
||||
{
|
||||
std::cout << "---" << player_name(active)
|
||||
<< ": Spurious wakeup!" << std::endl;
|
||||
}
|
||||
} while (state == other);
|
||||
}
|
||||
|
||||
@@ -60,7 +74,10 @@ void player(void* param)
|
||||
|
||||
struct thread_adapt
|
||||
{
|
||||
thread_adapt(void (*func)(void*), void* param) : _func(func), _param(param) { }
|
||||
thread_adapt(void (*func)(void*), void* param)
|
||||
: _func(func), _param(param)
|
||||
{
|
||||
}
|
||||
int operator()() const
|
||||
{
|
||||
_func(_param);
|
||||
@@ -74,7 +91,10 @@ struct thread_adapt
|
||||
class thread_adapter
|
||||
{
|
||||
public:
|
||||
thread_adapter(void (*func)(void*), void* param) : _func(func), _param(param) { }
|
||||
thread_adapter(void (*func)(void*), void* param)
|
||||
: _func(func), _param(param)
|
||||
{
|
||||
}
|
||||
void operator()() const { _func(_param); }
|
||||
private:
|
||||
void (*_func)(void*);
|
||||
|
||||
@@ -1,29 +1,40 @@
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. William E. Kempf makes no representations
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#include <boost/thread/thread.hpp>
|
||||
#include <boost/thread/xtime.hpp>
|
||||
#include <iostream>
|
||||
|
||||
struct thread_alarm
|
||||
{
|
||||
thread_alarm(int secs) : m_secs(secs) { }
|
||||
void operator()()
|
||||
{
|
||||
boost::xtime xt;
|
||||
boost::xtime_get(&xt, boost::TIME_UTC);
|
||||
xt.sec += m_secs;
|
||||
thread_alarm(int secs) : m_secs(secs) { }
|
||||
void operator()()
|
||||
{
|
||||
boost::xtime xt;
|
||||
boost::xtime_get(&xt, boost::TIME_UTC);
|
||||
xt.sec += m_secs;
|
||||
|
||||
boost::thread::sleep(xt);
|
||||
boost::thread::sleep(xt);
|
||||
|
||||
std::cout << "alarm sounded..." << std::endl;
|
||||
}
|
||||
std::cout << "alarm sounded..." << std::endl;
|
||||
}
|
||||
|
||||
int m_secs;
|
||||
int m_secs;
|
||||
};
|
||||
|
||||
int main(int argc, char* argv[])
|
||||
{
|
||||
int secs = 5;
|
||||
std::cout << "setting alarm for 5 seconds..." << std::endl;
|
||||
thread_alarm alarm(secs);
|
||||
boost::thread thrd(alarm);
|
||||
thrd.join();
|
||||
int secs = 5;
|
||||
std::cout << "setting alarm for 5 seconds..." << std::endl;
|
||||
thread_alarm alarm(secs);
|
||||
boost::thread thrd(alarm);
|
||||
thrd.join();
|
||||
}
|
||||
|
||||
@@ -1,3 +1,14 @@
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. William E. Kempf makes no representations
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#include <boost/thread/thread.hpp>
|
||||
#include <iostream>
|
||||
|
||||
@@ -6,14 +17,14 @@ boost::mutex mutex;
|
||||
|
||||
void increment_count()
|
||||
{
|
||||
boost::mutex::scoped_lock lock(mutex);
|
||||
std::cout << "count = " << ++count << std::endl;
|
||||
boost::mutex::scoped_lock lock(mutex);
|
||||
std::cout << "count = " << ++count << std::endl;
|
||||
}
|
||||
|
||||
int main(int argc, char* argv[])
|
||||
{
|
||||
boost::thread_group threads;
|
||||
for (int i = 0; i < 10; ++i)
|
||||
threads.create_thread(&increment_count);
|
||||
threads.join_all();
|
||||
boost::thread_group threads;
|
||||
for (int i = 0; i < 10; ++i)
|
||||
threads.create_thread(&increment_count);
|
||||
threads.join_all();
|
||||
}
|
||||
|
||||
@@ -1,3 +1,14 @@
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. William E. Kempf makes no representations
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#include <boost/thread/thread.hpp>
|
||||
#include <boost/thread/tss.hpp>
|
||||
#include <cassert>
|
||||
@@ -6,25 +17,25 @@ boost::thread_specific_ptr<int> value;
|
||||
|
||||
void increment()
|
||||
{
|
||||
int* p = value.get();
|
||||
++*p;
|
||||
int* p = value.get();
|
||||
++*p;
|
||||
}
|
||||
|
||||
void thread_proc()
|
||||
{
|
||||
value.reset(new int(0)); // initialize the thread's storage
|
||||
for (int i=0; i<10; ++i)
|
||||
{
|
||||
increment();
|
||||
int* p = value.get();
|
||||
assert(*p == i+1);
|
||||
}
|
||||
value.reset(new int(0)); // initialize the thread's storage
|
||||
for (int i=0; i<10; ++i)
|
||||
{
|
||||
increment();
|
||||
int* p = value.get();
|
||||
assert(*p == i+1);
|
||||
}
|
||||
}
|
||||
|
||||
int main(int argc, char* argv[])
|
||||
{
|
||||
boost::thread_group threads;
|
||||
for (int i=0; i<5; ++i)
|
||||
threads.create_thread(&thread_proc);
|
||||
threads.join_all();
|
||||
boost::thread_group threads;
|
||||
for (int i=0; i<5; ++i)
|
||||
threads.create_thread(&thread_proc);
|
||||
threads.join_all();
|
||||
}
|
||||
|
||||
@@ -1,10 +1,21 @@
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. William E. Kempf makes no representations
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#include <boost/thread/thread.hpp>
|
||||
#include <boost/thread/xtime.hpp>
|
||||
|
||||
int main(int argc, char* argv[])
|
||||
{
|
||||
boost::xtime xt;
|
||||
boost::xtime_get(&xt, boost::TIME_UTC);
|
||||
xt.sec += 1;
|
||||
boost::thread::sleep(xt); // Sleep for 1 second
|
||||
boost::xtime xt;
|
||||
boost::xtime_get(&xt, boost::TIME_UTC);
|
||||
xt.sec += 1;
|
||||
boost::thread::sleep(xt); // Sleep for 1 second
|
||||
}
|
||||
|
||||
24
include/boost/thread.hpp
Normal file
24
include/boost/thread.hpp
Normal file
@@ -0,0 +1,24 @@
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. William E. Kempf makes no representations
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#if !defined(BOOST_THREAD_WEK01082003_HPP)
|
||||
#define BOOST_THREAD_WEK01082003_HPP
|
||||
|
||||
#include <boost/thread/thread.hpp>
|
||||
#include <boost/thread/condition.hpp>
|
||||
#include <boost/thread/exceptions.hpp>
|
||||
#include <boost/thread/mutex.hpp>
|
||||
#include <boost/thread/once.hpp>
|
||||
#include <boost/thread/recursive_mutex.hpp>
|
||||
#include <boost/thread/tss.hpp>
|
||||
#include <boost/thread/xtime.hpp>
|
||||
|
||||
#endif
|
||||
40
include/boost/thread/barrier.hpp
Normal file
40
include/boost/thread/barrier.hpp
Normal file
@@ -0,0 +1,40 @@
|
||||
// Copyright (C) 2002-2003
|
||||
// David Moore, William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. William E. Kempf makes no representations
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#ifndef BOOST_BARRIER_JDM030602_HPP
|
||||
#define BOOST_BARRIER_JDM030602_HPP
|
||||
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
#include <boost/thread/mutex.hpp>
|
||||
#include <boost/thread/condition.hpp>
|
||||
|
||||
namespace boost {
|
||||
|
||||
class BOOST_THREAD_DECL barrier
|
||||
{
|
||||
public:
|
||||
barrier(unsigned int count);
|
||||
~barrier();
|
||||
|
||||
bool wait();
|
||||
|
||||
private:
|
||||
mutex m_mutex;
|
||||
condition m_cond;
|
||||
unsigned int m_threshold;
|
||||
unsigned int m_count;
|
||||
unsigned int m_generation;
|
||||
};
|
||||
|
||||
} // namespace boost
|
||||
|
||||
#endif
|
||||
@@ -1,4 +1,4 @@
|
||||
// Copyright (C) 2001
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
@@ -12,15 +12,11 @@
|
||||
#ifndef BOOST_CONDITION_WEK070601_HPP
|
||||
#define BOOST_CONDITION_WEK070601_HPP
|
||||
|
||||
#include <boost/config.hpp>
|
||||
#ifndef BOOST_HAS_THREADS
|
||||
# error Thread support is unavailable!
|
||||
#endif
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
#include <boost/thread/exceptions.hpp>
|
||||
#include <boost/utility.hpp>
|
||||
#include <boost/thread/detail/lock.hpp>
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
#if defined(BOOST_HAS_PTHREADS)
|
||||
# include <pthread.h>
|
||||
@@ -143,9 +139,9 @@ private:
|
||||
typedef detail::thread::lock_ops<M>
|
||||
#if defined(__HP_aCC) && __HP_aCC <= 33900 && !defined(BOOST_STRICT_CONFIG)
|
||||
# define lock_ops lock_ops_ // HP confuses lock_ops witht the template
|
||||
#endif
|
||||
#endif
|
||||
lock_ops;
|
||||
|
||||
|
||||
typename lock_ops::lock_state state;
|
||||
lock_ops::unlock(mutex, state);
|
||||
|
||||
@@ -169,9 +165,9 @@ private:
|
||||
typedef detail::thread::lock_ops<M>
|
||||
#if defined(__HP_aCC) && __HP_aCC <= 33900 && !defined(BOOST_STRICT_CONFIG)
|
||||
# define lock_ops lock_ops_ // HP confuses lock_ops witht the template
|
||||
#endif
|
||||
#endif
|
||||
lock_ops;
|
||||
|
||||
|
||||
typename lock_ops::lock_state state;
|
||||
lock_ops::unlock(mutex, state);
|
||||
|
||||
|
||||
@@ -1,14 +1,86 @@
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. William E. Kempf makes no representations
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#ifndef BOOST_THREAD_CONFIG_WEK01032003_HPP
|
||||
#define BOOST_THREAD_CONFIG_WEK01032003_HPP
|
||||
|
||||
#if defined(BOOST_HAS_WINTHREADS)
|
||||
# if defined(BOOST_THREAD_BUILD_DLL)
|
||||
# define BOOST_THREAD_DECL __declspec(dllexport)
|
||||
#include <boost/config.hpp>
|
||||
|
||||
// insist on threading support being available:
|
||||
#include <boost/config/requires_threads.hpp>
|
||||
|
||||
#if defined(BOOST_THREAD_BUILD_DLL) //Build dll
|
||||
#elif defined(BOOST_THREAD_BUILD_LIB) //Build lib
|
||||
#elif defined(BOOST_THREAD_USE_DLL) //Use dll
|
||||
#elif defined(BOOST_THREAD_USE_LIB) //Use lib
|
||||
#else //Use default
|
||||
# if defined(BOOST_HAS_WINTHREADS)
|
||||
# if defined(BOOST_MSVC) || defined(BOOST_INTEL_WIN)
|
||||
//For compilers supporting auto-tss cleanup
|
||||
//with Boost.Threads lib, use Boost.Threads lib
|
||||
# define BOOST_THREAD_USE_LIB
|
||||
# else
|
||||
//For compilers not yet supporting auto-tss cleanup
|
||||
//with Boost.Threads lib, use Boost.Threads dll
|
||||
# define BOOST_THREAD_USE_DLL
|
||||
# endif
|
||||
# else
|
||||
# define BOOST_THREAD_USE_LIB
|
||||
# endif
|
||||
#endif
|
||||
|
||||
#if defined(BOOST_HAS_DECLSPEC)
|
||||
# if defined(BOOST_THREAD_BUILD_DLL) //Build dll
|
||||
# define BOOST_THREAD_DECL __declspec(dllexport)
|
||||
# elif defined(BOOST_THREAD_USE_DLL) //Use dll
|
||||
# define BOOST_THREAD_DECL __declspec(dllimport)
|
||||
# else
|
||||
# define BOOST_THREAD_DECL
|
||||
# endif
|
||||
#else
|
||||
# define BOOST_THREAD_DECL
|
||||
#endif // BOOST_THREAD_SHARED_LIB
|
||||
#endif // BOOST_HAS_DECLSPEC
|
||||
|
||||
//
|
||||
// Automatically link to the correct build variant where possible.
|
||||
//
|
||||
#if !defined(BOOST_ALL_NO_LIB) && !defined(BOOST_THREAD_NO_LIB) && !defined(BOOST_THREAD_BUILD_DLL) && !defined(BOOST_THREAD_BUILD_LIB)
|
||||
//
|
||||
// Tell the autolink to link dynamically, this will get undef'ed by auto_link.hpp
|
||||
// once it's done with it:
|
||||
//
|
||||
#if defined(BOOST_THREAD_USE_DLL)
|
||||
# define BOOST_DYN_LINK
|
||||
#endif
|
||||
//
|
||||
// Set the name of our library, this will get undef'ed by auto_link.hpp
|
||||
// once it's done with it:
|
||||
//
|
||||
#if defined(BOOST_THREAD_LIB_NAME)
|
||||
# define BOOST_LIB_NAME BOOST_THREAD_LIB_NAME
|
||||
#else
|
||||
# define BOOST_LIB_NAME boost_thread
|
||||
#endif
|
||||
//
|
||||
// If we're importing code from a dll, then tell auto_link.hpp about it:
|
||||
//
|
||||
// And include the header that does the work:
|
||||
//
|
||||
#include <boost/config/auto_link.hpp>
|
||||
#endif // auto-linking disabled
|
||||
|
||||
#endif // BOOST_THREAD_CONFIG_WEK1032003_HPP
|
||||
|
||||
// Change Log:
|
||||
// 22 Jan 05 Roland Schwarz (speedsnail)
|
||||
// Usage of BOOST_HAS_DECLSPEC macro.
|
||||
// Default again is static lib usage.
|
||||
// BOOST_DYN_LINK only defined when autolink included.
|
||||
|
||||
@@ -1,44 +1,39 @@
|
||||
// Copyright (C) 2001
|
||||
// Copyright (C) 2001-2003
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
// Distributed under the Boost Software License, Version 1.0. (See
|
||||
// accompanying file LICENSE_1_0.txt or copy at
|
||||
// http://www.boost.org/LICENSE_1_0.txt)
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
|
||||
#ifndef BOOST_FORCE_CAST_MJM012402_HPP
|
||||
#define BOOST_FORCE_CAST_MJM012402_HPP
|
||||
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
namespace boost {
|
||||
|
||||
namespace detail {
|
||||
|
||||
namespace thread {
|
||||
|
||||
|
||||
// force_cast will convert anything to anything.
|
||||
|
||||
// general case
|
||||
template<class Return_Type, class Argument_Type>
|
||||
inline Return_Type &force_cast(Argument_Type &rSrc)
|
||||
{ return(*reinterpret_cast<Return_Type *>(&rSrc)); }
|
||||
{
|
||||
return(*reinterpret_cast<Return_Type *>(&rSrc));
|
||||
}
|
||||
|
||||
// specialization for const
|
||||
template<class Return_Type, class Argument_Type>
|
||||
inline const Return_Type &force_cast(const Argument_Type &rSrc)
|
||||
{ return(*reinterpret_cast<const Return_Type *>(&rSrc)); }
|
||||
|
||||
{
|
||||
return(*reinterpret_cast<const Return_Type *>(&rSrc));
|
||||
}
|
||||
|
||||
} // namespace thread
|
||||
|
||||
} // namespace detail
|
||||
|
||||
} // namespace boost
|
||||
|
||||
|
||||
#endif // BOOST_FORCE_CAST_MJM012402_HPP
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
// Copyright (C) 2001
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
@@ -12,6 +12,8 @@
|
||||
#ifndef BOOST_XLOCK_WEK070601_HPP
|
||||
#define BOOST_XLOCK_WEK070601_HPP
|
||||
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
#include <boost/utility.hpp>
|
||||
#include <boost/thread/exceptions.hpp>
|
||||
|
||||
@@ -20,188 +22,193 @@ namespace boost {
|
||||
class condition;
|
||||
struct xtime;
|
||||
|
||||
namespace detail { namespace thread {
|
||||
namespace detail { namespace thread {
|
||||
|
||||
template <typename Mutex>
|
||||
class lock_ops : private noncopyable
|
||||
template <typename Mutex>
|
||||
class lock_ops : private noncopyable
|
||||
{
|
||||
private:
|
||||
lock_ops() { }
|
||||
|
||||
public:
|
||||
typedef typename Mutex::cv_state lock_state;
|
||||
|
||||
static void lock(Mutex& m)
|
||||
{
|
||||
private:
|
||||
lock_ops() { }
|
||||
|
||||
public:
|
||||
typedef typename Mutex::cv_state lock_state;
|
||||
|
||||
static void lock(Mutex& m)
|
||||
{
|
||||
m.do_lock();
|
||||
}
|
||||
static bool trylock(Mutex& m)
|
||||
{
|
||||
return m.do_trylock();
|
||||
}
|
||||
static bool timedlock(Mutex& m, const xtime& xt)
|
||||
{
|
||||
return m.do_timedlock(xt);
|
||||
}
|
||||
static void unlock(Mutex& m)
|
||||
{
|
||||
m.do_unlock();
|
||||
}
|
||||
static void lock(Mutex& m, lock_state& state)
|
||||
{
|
||||
m.do_lock(state);
|
||||
}
|
||||
static void unlock(Mutex& m, lock_state& state)
|
||||
{
|
||||
m.do_unlock(state);
|
||||
}
|
||||
};
|
||||
|
||||
template <typename Mutex>
|
||||
class scoped_lock : private noncopyable
|
||||
m.do_lock();
|
||||
}
|
||||
static bool trylock(Mutex& m)
|
||||
{
|
||||
public:
|
||||
typedef Mutex mutex_type;
|
||||
|
||||
explicit scoped_lock(Mutex& mx, bool initially_locked=true)
|
||||
: m_mutex(mx), m_locked(false)
|
||||
{
|
||||
if (initially_locked) lock();
|
||||
}
|
||||
~scoped_lock()
|
||||
{
|
||||
if (m_locked) unlock();
|
||||
}
|
||||
|
||||
void lock()
|
||||
{
|
||||
if (m_locked) throw lock_error();
|
||||
lock_ops<Mutex>::lock(m_mutex);
|
||||
m_locked = true;
|
||||
}
|
||||
void unlock()
|
||||
{
|
||||
if (!m_locked) throw lock_error();
|
||||
lock_ops<Mutex>::unlock(m_mutex);
|
||||
m_locked = false;
|
||||
}
|
||||
|
||||
bool locked() const { return m_locked; }
|
||||
operator const void*() const { return m_locked ? this : 0; }
|
||||
|
||||
private:
|
||||
friend class boost::condition;
|
||||
|
||||
Mutex& m_mutex;
|
||||
bool m_locked;
|
||||
};
|
||||
|
||||
template <typename TryMutex>
|
||||
class scoped_try_lock : private noncopyable
|
||||
return m.do_trylock();
|
||||
}
|
||||
static bool timedlock(Mutex& m, const xtime& xt)
|
||||
{
|
||||
public:
|
||||
typedef TryMutex mutex_type;
|
||||
|
||||
explicit scoped_try_lock(TryMutex& mx)
|
||||
: m_mutex(mx), m_locked(false)
|
||||
{
|
||||
try_lock();
|
||||
}
|
||||
scoped_try_lock(TryMutex& mx, bool initially_locked)
|
||||
: m_mutex(mx), m_locked(false)
|
||||
{
|
||||
if (initially_locked) lock();
|
||||
}
|
||||
~scoped_try_lock()
|
||||
{
|
||||
if (m_locked) unlock();
|
||||
}
|
||||
|
||||
void lock()
|
||||
{
|
||||
if (m_locked) throw lock_error();
|
||||
lock_ops<TryMutex>::lock(m_mutex);
|
||||
m_locked = true;
|
||||
}
|
||||
bool try_lock()
|
||||
{
|
||||
if (m_locked) throw lock_error();
|
||||
return (m_locked = lock_ops<TryMutex>::trylock(m_mutex));
|
||||
}
|
||||
void unlock()
|
||||
{
|
||||
if (!m_locked) throw lock_error();
|
||||
lock_ops<TryMutex>::unlock(m_mutex);
|
||||
m_locked = false;
|
||||
}
|
||||
|
||||
bool locked() const { return m_locked; }
|
||||
operator const void*() const { return m_locked ? this : 0; }
|
||||
|
||||
private:
|
||||
friend class boost::condition;
|
||||
|
||||
TryMutex& m_mutex;
|
||||
bool m_locked;
|
||||
};
|
||||
|
||||
template <typename TimedMutex>
|
||||
class scoped_timed_lock : private noncopyable
|
||||
return m.do_timedlock(xt);
|
||||
}
|
||||
static void unlock(Mutex& m)
|
||||
{
|
||||
public:
|
||||
typedef TimedMutex mutex_type;
|
||||
m.do_unlock();
|
||||
}
|
||||
static void lock(Mutex& m, lock_state& state)
|
||||
{
|
||||
m.do_lock(state);
|
||||
}
|
||||
static void unlock(Mutex& m, lock_state& state)
|
||||
{
|
||||
m.do_unlock(state);
|
||||
}
|
||||
};
|
||||
|
||||
scoped_timed_lock(TimedMutex& mx, const xtime& xt)
|
||||
: m_mutex(mx), m_locked(false)
|
||||
{
|
||||
timed_lock(xt);
|
||||
}
|
||||
scoped_timed_lock(TimedMutex& mx, bool initially_locked)
|
||||
: m_mutex(mx), m_locked(false)
|
||||
{
|
||||
if (initially_locked) lock();
|
||||
}
|
||||
~scoped_timed_lock()
|
||||
{
|
||||
if (m_locked) unlock();
|
||||
}
|
||||
template <typename Mutex>
|
||||
class scoped_lock : private noncopyable
|
||||
{
|
||||
public:
|
||||
typedef Mutex mutex_type;
|
||||
|
||||
void lock()
|
||||
{
|
||||
if (m_locked) throw lock_error();
|
||||
lock_ops<TimedMutex>::lock(m_mutex);
|
||||
m_locked = true;
|
||||
}
|
||||
bool timed_lock(const xtime& xt)
|
||||
{
|
||||
if (m_locked) throw lock_error();
|
||||
return (m_locked = lock_ops<TimedMutex>::timedlock(m_mutex, xt));
|
||||
}
|
||||
void unlock()
|
||||
{
|
||||
if (!m_locked) throw lock_error();
|
||||
lock_ops<TimedMutex>::unlock(m_mutex);
|
||||
m_locked = false;
|
||||
}
|
||||
explicit scoped_lock(Mutex& mx, bool initially_locked=true)
|
||||
: m_mutex(mx), m_locked(false)
|
||||
{
|
||||
if (initially_locked) lock();
|
||||
}
|
||||
~scoped_lock()
|
||||
{
|
||||
if (m_locked) unlock();
|
||||
}
|
||||
|
||||
bool locked() const { return m_locked; }
|
||||
operator const void*() const { return m_locked ? this : 0; }
|
||||
void lock()
|
||||
{
|
||||
if (m_locked) throw lock_error();
|
||||
lock_ops<Mutex>::lock(m_mutex);
|
||||
m_locked = true;
|
||||
}
|
||||
void unlock()
|
||||
{
|
||||
if (!m_locked) throw lock_error();
|
||||
lock_ops<Mutex>::unlock(m_mutex);
|
||||
m_locked = false;
|
||||
}
|
||||
|
||||
private:
|
||||
friend class boost::condition;
|
||||
bool locked() const { return m_locked; }
|
||||
operator const void*() const { return m_locked ? this : 0; }
|
||||
|
||||
TimedMutex& m_mutex;
|
||||
bool m_locked;
|
||||
};
|
||||
private:
|
||||
friend class boost::condition;
|
||||
|
||||
} // namespace thread
|
||||
} // namespace detail
|
||||
Mutex& m_mutex;
|
||||
bool m_locked;
|
||||
};
|
||||
|
||||
template <typename TryMutex>
|
||||
class scoped_try_lock : private noncopyable
|
||||
{
|
||||
public:
|
||||
typedef TryMutex mutex_type;
|
||||
|
||||
explicit scoped_try_lock(TryMutex& mx)
|
||||
: m_mutex(mx), m_locked(false)
|
||||
{
|
||||
try_lock();
|
||||
}
|
||||
scoped_try_lock(TryMutex& mx, bool initially_locked)
|
||||
: m_mutex(mx), m_locked(false)
|
||||
{
|
||||
if (initially_locked) lock();
|
||||
}
|
||||
~scoped_try_lock()
|
||||
{
|
||||
if (m_locked) unlock();
|
||||
}
|
||||
|
||||
void lock()
|
||||
{
|
||||
if (m_locked) throw lock_error();
|
||||
lock_ops<TryMutex>::lock(m_mutex);
|
||||
m_locked = true;
|
||||
}
|
||||
bool try_lock()
|
||||
{
|
||||
if (m_locked) throw lock_error();
|
||||
return (m_locked = lock_ops<TryMutex>::trylock(m_mutex));
|
||||
}
|
||||
void unlock()
|
||||
{
|
||||
if (!m_locked) throw lock_error();
|
||||
lock_ops<TryMutex>::unlock(m_mutex);
|
||||
m_locked = false;
|
||||
}
|
||||
|
||||
bool locked() const { return m_locked; }
|
||||
operator const void*() const { return m_locked ? this : 0; }
|
||||
|
||||
private:
|
||||
friend class boost::condition;
|
||||
|
||||
TryMutex& m_mutex;
|
||||
bool m_locked;
|
||||
};
|
||||
|
||||
template <typename TimedMutex>
|
||||
class scoped_timed_lock : private noncopyable
|
||||
{
|
||||
public:
|
||||
typedef TimedMutex mutex_type;
|
||||
|
||||
scoped_timed_lock(TimedMutex& mx, const xtime& xt)
|
||||
: m_mutex(mx), m_locked(false)
|
||||
{
|
||||
timed_lock(xt);
|
||||
}
|
||||
scoped_timed_lock(TimedMutex& mx, bool initially_locked)
|
||||
: m_mutex(mx), m_locked(false)
|
||||
{
|
||||
if (initially_locked) lock();
|
||||
}
|
||||
~scoped_timed_lock()
|
||||
{
|
||||
if (m_locked) unlock();
|
||||
}
|
||||
|
||||
void lock()
|
||||
{
|
||||
if (m_locked) throw lock_error();
|
||||
lock_ops<TimedMutex>::lock(m_mutex);
|
||||
m_locked = true;
|
||||
}
|
||||
bool try_lock()
|
||||
{
|
||||
if (m_locked) throw lock_error();
|
||||
return (m_locked = lock_ops<TimedMutex>::trylock(m_mutex));
|
||||
}
|
||||
bool timed_lock(const xtime& xt)
|
||||
{
|
||||
if (m_locked) throw lock_error();
|
||||
return (m_locked = lock_ops<TimedMutex>::timedlock(m_mutex, xt));
|
||||
}
|
||||
void unlock()
|
||||
{
|
||||
if (!m_locked) throw lock_error();
|
||||
lock_ops<TimedMutex>::unlock(m_mutex);
|
||||
m_locked = false;
|
||||
}
|
||||
|
||||
bool locked() const { return m_locked; }
|
||||
operator const void*() const { return m_locked ? this : 0; }
|
||||
|
||||
private:
|
||||
friend class boost::condition;
|
||||
|
||||
TimedMutex& m_mutex;
|
||||
bool m_locked;
|
||||
};
|
||||
|
||||
} // namespace thread
|
||||
} // namespace detail
|
||||
} // namespace boost
|
||||
|
||||
#endif // BOOST_XLOCK_WEK070601_HPP
|
||||
|
||||
// Change Log:
|
||||
// 8 Feb 01 WEKEMPF Initial version.
|
||||
// 22 May 01 WEKEMPF Modified to use xtime for time outs.
|
||||
// 30 Jul 01 WEKEMPF Moved lock types into boost::detail::thread. Renamed some types.
|
||||
// Added locked() methods.
|
||||
|
||||
#endif // BOOST_XLOCK_WEK070601_HPP
|
||||
// 30 Jul 01 WEKEMPF Moved lock types into boost::detail::thread. Renamed
|
||||
// some types. Added locked() methods.
|
||||
|
||||
@@ -1,64 +1,59 @@
|
||||
// Copyright (C) 2001
|
||||
// Copyright (C) 2001-2003
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
// Distributed under the Boost Software License, Version 1.0. (See
|
||||
// accompanying file LICENSE_1_0.txt or copy at
|
||||
// http://www.boost.org/LICENSE_1_0.txt)
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
|
||||
#ifndef BOOST_SINGLETON_MJM012402_HPP
|
||||
#define BOOST_SINGLETON_MJM012402_HPP
|
||||
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
namespace boost {
|
||||
|
||||
namespace detail {
|
||||
|
||||
namespace thread {
|
||||
|
||||
// class singleton has the same goal as all singletons: create one instance of a
|
||||
// class on demand, then dish it out as requested.
|
||||
// class singleton has the same goal as all singletons: create one instance of
|
||||
// a class on demand, then dish it out as requested.
|
||||
|
||||
template<class T>
|
||||
class singleton: private T
|
||||
template <class T>
|
||||
class singleton : private T
|
||||
{
|
||||
private:
|
||||
private:
|
||||
singleton();
|
||||
~singleton();
|
||||
|
||||
public:
|
||||
public:
|
||||
static T &instance();
|
||||
};
|
||||
|
||||
|
||||
template<class T>
|
||||
template <class T>
|
||||
inline singleton<T>::singleton()
|
||||
{ /* no-op */ }
|
||||
{
|
||||
/* no-op */
|
||||
}
|
||||
|
||||
template<class T>
|
||||
template <class T>
|
||||
inline singleton<T>::~singleton()
|
||||
{ /* no-op */ }
|
||||
{
|
||||
/* no-op */
|
||||
}
|
||||
|
||||
|
||||
template<class T>
|
||||
template <class T>
|
||||
/*static*/ T &singleton<T>::instance()
|
||||
{
|
||||
// function-local static to force this to work correctly at static initialization
|
||||
// time.
|
||||
// function-local static to force this to work correctly at static
|
||||
// initialization time.
|
||||
static singleton<T> s_oT;
|
||||
return(s_oT);
|
||||
}
|
||||
|
||||
|
||||
} // namespace thread
|
||||
|
||||
} // namespace detail
|
||||
|
||||
} // namespace boost
|
||||
|
||||
|
||||
#endif // BOOST_SINGLETON_MJM012402_HPP
|
||||
|
||||
@@ -1,14 +0,0 @@
|
||||
#include <boost/config.hpp>
|
||||
#ifndef BOOST_HAS_THREADS
|
||||
# error Thread support is unavailable!
|
||||
#endif
|
||||
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
#ifdef BOOST_HAS_WINTHREADS
|
||||
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
extern "C" BOOST_THREAD_DECL int on_thread_exit(void (__cdecl * func)(void));
|
||||
|
||||
#endif // BOOST_HAS_WINTHREADS
|
||||
78
include/boost/thread/detail/tss_hooks.hpp
Normal file
78
include/boost/thread/detail/tss_hooks.hpp
Normal file
@@ -0,0 +1,78 @@
|
||||
// (C) Copyright Michael Glassford 2004.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
#if !defined(BOOST_TLS_HOOKS_HPP)
|
||||
#define BOOST_TLS_HOOKS_HPP
|
||||
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
#if defined(BOOST_HAS_WINTHREADS)
|
||||
|
||||
typedef void (__cdecl *thread_exit_handler)(void);
|
||||
|
||||
extern "C" BOOST_THREAD_DECL int at_thread_exit(
|
||||
thread_exit_handler exit_handler
|
||||
);
|
||||
//Add a function to the list of functions that will
|
||||
//be called when a thread is about to exit.
|
||||
//Currently only implemented for Win32, but should
|
||||
//later be implemented for all platforms.
|
||||
//Used by Win32 implementation of Boost.Threads
|
||||
//tss to peform cleanup.
|
||||
//Like the C runtime library atexit() function,
|
||||
//which it mimics, at_thread_exit() returns
|
||||
//zero if successful and a nonzero
|
||||
//value if an error occurs.
|
||||
|
||||
#endif //defined(BOOST_HAS_WINTHREADS)
|
||||
|
||||
#if defined(BOOST_HAS_WINTHREADS)
|
||||
|
||||
extern "C" BOOST_THREAD_DECL void on_process_enter(void);
|
||||
//Function to be called when the exe or dll
|
||||
//that uses Boost.Threads first starts
|
||||
//or is first loaded.
|
||||
//Should be called only before the first call to
|
||||
//on_thread_enter().
|
||||
//Called automatically by Boost.Threads when
|
||||
//a method for doing so has been discovered.
|
||||
//May be omitted; may be called multiple times.
|
||||
|
||||
extern "C" BOOST_THREAD_DECL void on_process_exit(void);
|
||||
//Function to be called when the exe or dll
|
||||
//that uses Boost.Threads first starts
|
||||
//or is first loaded.
|
||||
//Should be called only after the last call to
|
||||
//on_exit_thread().
|
||||
//Called automatically by Boost.Threads when
|
||||
//a method for doing so has been discovered.
|
||||
//Must not be omitted; may be called multiple times.
|
||||
|
||||
extern "C" BOOST_THREAD_DECL void on_thread_enter(void);
|
||||
//Function to be called just after a thread starts
|
||||
//in an exe or dll that uses Boost.Threads.
|
||||
//Must be called in the context of the thread
|
||||
//that is starting.
|
||||
//Called automatically by Boost.Threads when
|
||||
//a method for doing so has been discovered.
|
||||
//May be omitted; may be called multiple times.
|
||||
|
||||
extern "C" BOOST_THREAD_DECL void on_thread_exit(void);
|
||||
//Function to be called just be fore a thread ends
|
||||
//in an exe or dll that uses Boost.Threads.
|
||||
//Must be called in the context of the thread
|
||||
//that is ending.
|
||||
//Called automatically by Boost.Threads when
|
||||
//a method for doing so has been discovered.
|
||||
//Must not be omitted; may be called multiple times.
|
||||
|
||||
extern "C" void tss_cleanup_implemented(void);
|
||||
//Dummy function used both to detect whether tss cleanup
|
||||
//cleanup has been implemented and to force
|
||||
//it to be linked into the Boost.Threads library.
|
||||
|
||||
#endif //defined(BOOST_HAS_WINTHREADS)
|
||||
|
||||
#endif //!defined(BOOST_TLS_HOOKS_HPP)
|
||||
@@ -1,4 +1,4 @@
|
||||
// Copyright (C) 2001
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
@@ -12,7 +12,6 @@
|
||||
#ifndef BOOST_THREAD_EXCEPTIONS_PDM070801_H
|
||||
#define BOOST_THREAD_EXCEPTIONS_PDM070801_H
|
||||
|
||||
#include <boost/config.hpp>
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
// pdm: Sorry, but this class is used all over the place & I end up
|
||||
@@ -21,25 +20,82 @@
|
||||
// given the include guards, but regardless it makes sense to
|
||||
// seperate this out any way.
|
||||
|
||||
#include <string>
|
||||
#include <stdexcept>
|
||||
|
||||
namespace boost {
|
||||
|
||||
class BOOST_THREAD_DECL lock_error : public std::logic_error
|
||||
class BOOST_THREAD_DECL thread_exception : public std::exception
|
||||
{
|
||||
protected:
|
||||
thread_exception();
|
||||
thread_exception(int sys_err_code);
|
||||
|
||||
public:
|
||||
~thread_exception() throw();
|
||||
|
||||
int native_error() const;
|
||||
|
||||
const char* message() const;
|
||||
|
||||
private:
|
||||
int m_sys_err;
|
||||
};
|
||||
|
||||
class BOOST_THREAD_DECL lock_error : public thread_exception
|
||||
{
|
||||
public:
|
||||
lock_error();
|
||||
lock_error(int sys_err_code);
|
||||
~lock_error() throw();
|
||||
|
||||
virtual const char* what() const throw();
|
||||
};
|
||||
|
||||
class BOOST_THREAD_DECL thread_resource_error : public std::runtime_error
|
||||
class BOOST_THREAD_DECL thread_resource_error : public thread_exception
|
||||
{
|
||||
public:
|
||||
thread_resource_error();
|
||||
thread_resource_error(int sys_err_code);
|
||||
~thread_resource_error() throw();
|
||||
|
||||
virtual const char* what() const throw();
|
||||
};
|
||||
|
||||
class BOOST_THREAD_DECL unsupported_thread_option : public thread_exception
|
||||
{
|
||||
public:
|
||||
unsupported_thread_option();
|
||||
unsupported_thread_option(int sys_err_code);
|
||||
~unsupported_thread_option() throw();
|
||||
|
||||
virtual const char* what() const throw();
|
||||
};
|
||||
|
||||
class BOOST_THREAD_DECL invalid_thread_argument : public thread_exception
|
||||
{
|
||||
public:
|
||||
invalid_thread_argument();
|
||||
invalid_thread_argument(int sys_err_code);
|
||||
~invalid_thread_argument() throw();
|
||||
|
||||
virtual const char* what() const throw();
|
||||
};
|
||||
|
||||
class BOOST_THREAD_DECL thread_permission_error : public thread_exception
|
||||
{
|
||||
public:
|
||||
thread_permission_error();
|
||||
thread_permission_error(int sys_err_code);
|
||||
~thread_permission_error() throw();
|
||||
|
||||
virtual const char* what() const throw();
|
||||
};
|
||||
|
||||
} // namespace boost
|
||||
|
||||
#endif // BOOST_THREAD_CONFIG_PDM070801_H
|
||||
|
||||
// Change log:
|
||||
// 3 Jan 03 WEKEMPF Modified for DLL implementation.
|
||||
|
||||
#endif // BOOST_THREAD_CONFIG_PDM070801_H
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
// Copyright (C) 2001
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
@@ -12,14 +12,10 @@
|
||||
#ifndef BOOST_MUTEX_WEK070601_HPP
|
||||
#define BOOST_MUTEX_WEK070601_HPP
|
||||
|
||||
#include <boost/config.hpp>
|
||||
#ifndef BOOST_HAS_THREADS
|
||||
# error Thread support is unavailable!
|
||||
#endif
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
#include <boost/utility.hpp>
|
||||
#include <boost/thread/detail/lock.hpp>
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
#if defined(BOOST_HAS_PTHREADS)
|
||||
# include <pthread.h>
|
||||
@@ -33,7 +29,8 @@ namespace boost {
|
||||
|
||||
struct xtime;
|
||||
|
||||
class BOOST_THREAD_DECL mutex : private noncopyable
|
||||
class BOOST_THREAD_DECL mutex
|
||||
: private noncopyable
|
||||
{
|
||||
public:
|
||||
friend class detail::thread::lock_ops<mutex>;
|
||||
@@ -63,6 +60,7 @@ private:
|
||||
|
||||
#if defined(BOOST_HAS_WINTHREADS)
|
||||
void* m_mutex;
|
||||
bool m_critical_section;
|
||||
#elif defined(BOOST_HAS_PTHREADS)
|
||||
pthread_mutex_t m_mutex;
|
||||
#elif defined(BOOST_HAS_MPTASKS)
|
||||
@@ -71,7 +69,8 @@ private:
|
||||
#endif
|
||||
};
|
||||
|
||||
class BOOST_THREAD_DECL try_mutex : private noncopyable
|
||||
class BOOST_THREAD_DECL try_mutex
|
||||
: private noncopyable
|
||||
{
|
||||
public:
|
||||
friend class detail::thread::lock_ops<try_mutex>;
|
||||
@@ -103,6 +102,7 @@ private:
|
||||
|
||||
#if defined(BOOST_HAS_WINTHREADS)
|
||||
void* m_mutex;
|
||||
bool m_critical_section;
|
||||
#elif defined(BOOST_HAS_PTHREADS)
|
||||
pthread_mutex_t m_mutex;
|
||||
#elif defined(BOOST_HAS_MPTASKS)
|
||||
@@ -111,7 +111,8 @@ private:
|
||||
#endif
|
||||
};
|
||||
|
||||
class BOOST_THREAD_DECL timed_mutex : private noncopyable
|
||||
class BOOST_THREAD_DECL timed_mutex
|
||||
: private noncopyable
|
||||
{
|
||||
public:
|
||||
friend class detail::thread::lock_ops<timed_mutex>;
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
// Copyright (C) 2001
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
@@ -12,11 +12,6 @@
|
||||
#ifndef BOOST_ONCE_WEK080101_HPP
|
||||
#define BOOST_ONCE_WEK080101_HPP
|
||||
|
||||
#include <boost/config.hpp>
|
||||
#ifndef BOOST_HAS_THREADS
|
||||
# error Thread support is unavailable!
|
||||
#endif
|
||||
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
#if defined(BOOST_HAS_PTHREADS)
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
// Copyright (C) 2001
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
@@ -12,18 +12,16 @@
|
||||
#ifndef BOOST_RECURSIVE_MUTEX_WEK070601_HPP
|
||||
#define BOOST_RECURSIVE_MUTEX_WEK070601_HPP
|
||||
|
||||
#include <boost/config.hpp>
|
||||
#ifndef BOOST_HAS_THREADS
|
||||
# error Thread support is unavailable!
|
||||
#endif
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
#include <boost/utility.hpp>
|
||||
#include <boost/thread/detail/lock.hpp>
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
#if defined(BOOST_HAS_PTHREADS)
|
||||
# include <pthread.h>
|
||||
#elif defined(BOOST_HAS_MPTASKS)
|
||||
#endif
|
||||
|
||||
#if defined(BOOST_HAS_MPTASKS)
|
||||
# include "scoped_critical_region.hpp"
|
||||
#endif
|
||||
|
||||
@@ -31,7 +29,8 @@ namespace boost {
|
||||
|
||||
struct xtime;
|
||||
|
||||
class BOOST_THREAD_DECL recursive_mutex : private noncopyable
|
||||
class BOOST_THREAD_DECL recursive_mutex
|
||||
: private noncopyable
|
||||
{
|
||||
public:
|
||||
friend class detail::thread::lock_ops<recursive_mutex>;
|
||||
@@ -58,6 +57,7 @@ private:
|
||||
|
||||
#if defined(BOOST_HAS_WINTHREADS)
|
||||
void* m_mutex;
|
||||
bool m_critical_section;
|
||||
unsigned long m_count;
|
||||
#elif defined(BOOST_HAS_PTHREADS)
|
||||
pthread_mutex_t m_mutex;
|
||||
@@ -74,13 +74,15 @@ private:
|
||||
#endif
|
||||
};
|
||||
|
||||
class BOOST_THREAD_DECL recursive_try_mutex : private noncopyable
|
||||
class BOOST_THREAD_DECL recursive_try_mutex
|
||||
: private noncopyable
|
||||
{
|
||||
public:
|
||||
friend class detail::thread::lock_ops<recursive_try_mutex>;
|
||||
|
||||
typedef detail::thread::scoped_lock<recursive_try_mutex> scoped_lock;
|
||||
typedef detail::thread::scoped_try_lock<recursive_try_mutex> scoped_try_lock;
|
||||
typedef detail::thread::scoped_try_lock<
|
||||
recursive_try_mutex> scoped_try_lock;
|
||||
|
||||
recursive_try_mutex();
|
||||
~recursive_try_mutex();
|
||||
@@ -103,6 +105,7 @@ private:
|
||||
|
||||
#if defined(BOOST_HAS_WINTHREADS)
|
||||
void* m_mutex;
|
||||
bool m_critical_section;
|
||||
unsigned long m_count;
|
||||
#elif defined(BOOST_HAS_PTHREADS)
|
||||
pthread_mutex_t m_mutex;
|
||||
@@ -119,14 +122,17 @@ private:
|
||||
#endif
|
||||
};
|
||||
|
||||
class BOOST_THREAD_DECL recursive_timed_mutex : private noncopyable
|
||||
class BOOST_THREAD_DECL recursive_timed_mutex
|
||||
: private noncopyable
|
||||
{
|
||||
public:
|
||||
friend class detail::thread::lock_ops<recursive_timed_mutex>;
|
||||
|
||||
typedef detail::thread::scoped_lock<recursive_timed_mutex> scoped_lock;
|
||||
typedef detail::thread::scoped_try_lock<recursive_timed_mutex> scoped_try_lock;
|
||||
typedef detail::thread::scoped_timed_lock<recursive_timed_mutex> scoped_timed_lock;
|
||||
typedef detail::thread::scoped_try_lock<
|
||||
recursive_timed_mutex> scoped_try_lock;
|
||||
typedef detail::thread::scoped_timed_lock<
|
||||
recursive_timed_mutex> scoped_timed_lock;
|
||||
|
||||
recursive_timed_mutex();
|
||||
~recursive_timed_mutex();
|
||||
@@ -166,12 +172,11 @@ private:
|
||||
|
||||
} // namespace boost
|
||||
|
||||
#endif // BOOST_RECURSIVE_MUTEX_WEK070601_HPP
|
||||
|
||||
// Change Log:
|
||||
// 8 Feb 01 WEKEMPF Initial version.
|
||||
// 1 Jun 01 WEKEMPF Modified to use xtime for time outs. Factored out
|
||||
// to three classes, mutex, try_mutex and timed_mutex.
|
||||
// 11 Jun 01 WEKEMPF Modified to use PTHREAD_MUTEX_RECURSIVE if available.
|
||||
// 3 Jan 03 WEKEMPF Modified for DLL implementation.
|
||||
|
||||
|
||||
#endif // BOOST_RECURSIVE_MUTEX_WEK070601_HPP
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
// Copyright (C) 2001
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
@@ -12,15 +12,11 @@
|
||||
#ifndef BOOST_THREAD_WEK070601_HPP
|
||||
#define BOOST_THREAD_WEK070601_HPP
|
||||
|
||||
#include <boost/config.hpp>
|
||||
#ifndef BOOST_HAS_THREADS
|
||||
# error Thread support is unavailable!
|
||||
#endif
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
#include <boost/utility.hpp>
|
||||
#include <boost/function.hpp>
|
||||
#include <boost/thread/mutex.hpp>
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
#include <list>
|
||||
#include <memory>
|
||||
|
||||
@@ -74,6 +70,7 @@ public:
|
||||
void add_thread(thread* thrd);
|
||||
void remove_thread(thread* thrd);
|
||||
void join_all();
|
||||
int size();
|
||||
|
||||
private:
|
||||
std::list<thread*> m_threads;
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
// Copyright (C) 2001
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
@@ -12,13 +12,11 @@
|
||||
#ifndef BOOST_TSS_WEK070601_HPP
|
||||
#define BOOST_TSS_WEK070601_HPP
|
||||
|
||||
#include <boost/config.hpp>
|
||||
#ifndef BOOST_HAS_THREADS
|
||||
# error Thread support is unavailable!
|
||||
#endif
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
#include <boost/utility.hpp>
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
#include <boost/function.hpp>
|
||||
#include <boost/thread/exceptions.hpp>
|
||||
|
||||
#if defined(BOOST_HAS_PTHREADS)
|
||||
# include <pthread.h>
|
||||
@@ -28,55 +26,96 @@
|
||||
|
||||
namespace boost {
|
||||
|
||||
namespace detail {
|
||||
class BOOST_THREAD_DECL tss : private noncopyable
|
||||
namespace detail {
|
||||
|
||||
class BOOST_THREAD_DECL tss : private noncopyable
|
||||
{
|
||||
public:
|
||||
tss(boost::function1<void, void*>* pcleanup) {
|
||||
if (pcleanup == 0) throw boost::thread_resource_error();
|
||||
try
|
||||
{
|
||||
public:
|
||||
tss(void (*cleanup)(void*)=0);
|
||||
~tss();
|
||||
|
||||
void* get() const;
|
||||
bool set(void* value);
|
||||
|
||||
private:
|
||||
#if defined(BOOST_HAS_WINTHREADS)
|
||||
unsigned long m_key;
|
||||
void (*m_cleanup)(void*);
|
||||
#elif defined(BOOST_HAS_PTHREADS)
|
||||
pthread_key_t m_key;
|
||||
#elif defined(BOOST_HAS_MPTASKS)
|
||||
TaskStorageIndex m_key;
|
||||
void (*m_cleanup)(void*);
|
||||
#endif
|
||||
};
|
||||
|
||||
#if defined(BOOST_HAS_MPTASKS)
|
||||
void thread_cleanup();
|
||||
#endif
|
||||
init(pcleanup);
|
||||
}
|
||||
catch (...)
|
||||
{
|
||||
delete pcleanup;
|
||||
throw boost::thread_resource_error();
|
||||
}
|
||||
}
|
||||
|
||||
void* get() const;
|
||||
void set(void* value);
|
||||
void cleanup(void* p);
|
||||
|
||||
private:
|
||||
unsigned int m_slot; //This is a "pseudo-slot", not a native slot
|
||||
|
||||
void init(boost::function1<void, void*>* pcleanup);
|
||||
};
|
||||
|
||||
#if defined(BOOST_HAS_MPTASKS)
|
||||
void thread_cleanup();
|
||||
#endif
|
||||
|
||||
template <typename T>
|
||||
struct tss_adapter
|
||||
{
|
||||
template <typename F>
|
||||
tss_adapter(const F& cleanup) : m_cleanup(cleanup) { }
|
||||
void operator()(void* p) { m_cleanup(static_cast<T*>(p)); }
|
||||
boost::function1<void, T*> m_cleanup;
|
||||
};
|
||||
|
||||
} // namespace detail
|
||||
|
||||
template <typename T>
|
||||
class thread_specific_ptr : private noncopyable
|
||||
{
|
||||
public:
|
||||
thread_specific_ptr() : m_tss(&thread_specific_ptr<T>::cleanup) { }
|
||||
thread_specific_ptr()
|
||||
: m_tss(new boost::function1<void, void*>(
|
||||
boost::detail::tss_adapter<T>(
|
||||
&thread_specific_ptr<T>::cleanup)))
|
||||
{
|
||||
}
|
||||
thread_specific_ptr(void (*clean)(T*))
|
||||
: m_tss(new boost::function1<void, void*>(
|
||||
boost::detail::tss_adapter<T>(clean)))
|
||||
{
|
||||
}
|
||||
~thread_specific_ptr() { reset(); }
|
||||
|
||||
T* get() const { return static_cast<T*>(m_tss.get()); }
|
||||
T* operator->() const { return get(); }
|
||||
T& operator*() const { return *get(); }
|
||||
T* release() { T* temp = get(); m_tss.set(0); return temp; }
|
||||
void reset(T* p=0) { T* cur = get(); if (cur == p) return; delete cur; m_tss.set(p); }
|
||||
T* release() { T* temp = get(); if (temp) m_tss.set(0); return temp; }
|
||||
void reset(T* p=0)
|
||||
{
|
||||
T* cur = get();
|
||||
if (cur == p) return;
|
||||
m_tss.set(p);
|
||||
if (cur) m_tss.cleanup(cur);
|
||||
}
|
||||
|
||||
private:
|
||||
static void cleanup(void* p) { delete static_cast<T*>(p); }
|
||||
|
||||
mutable detail::tss m_tss;
|
||||
static void cleanup(T* p) { delete p; }
|
||||
detail::tss m_tss;
|
||||
};
|
||||
|
||||
} // namespace boost
|
||||
|
||||
#endif //BOOST_TSS_WEK070601_HPP
|
||||
|
||||
// Change Log:
|
||||
// 6 Jun 01 WEKEMPF Initial version.
|
||||
|
||||
#endif // BOOST_TSS_WEK070601_HPP
|
||||
|
||||
// 6 Jun 01
|
||||
// WEKEMPF Initial version.
|
||||
// 30 May 02 WEKEMPF
|
||||
// Added interface to set specific cleanup handlers.
|
||||
// Removed TLS slot limits from most implementations.
|
||||
// 22 Mar 04 GlassfordM for WEKEMPF
|
||||
// Fixed: thread_specific_ptr::reset() doesn't check error returned
|
||||
// by tss::set(); tss::set() now throws if it fails.
|
||||
// Fixed: calling thread_specific_ptr::reset() or
|
||||
// thread_specific_ptr::release() causes double-delete: once on
|
||||
// reset()/release() and once on ~thread_specific_ptr().
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
// Copyright (C) 2001
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
@@ -12,47 +12,48 @@
|
||||
#ifndef BOOST_XTIME_WEK070601_HPP
|
||||
#define BOOST_XTIME_WEK070601_HPP
|
||||
|
||||
#include <boost/config.hpp>
|
||||
#include <boost/cstdint.hpp>
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
#include <boost/cstdint.hpp>
|
||||
|
||||
namespace boost {
|
||||
|
||||
enum
|
||||
enum xtime_clock_types
|
||||
{
|
||||
TIME_UTC=1,
|
||||
TIME_TAI,
|
||||
TIME_MONOTONIC,
|
||||
TIME_PROCESS,
|
||||
TIME_THREAD,
|
||||
TIME_LOCAL,
|
||||
TIME_SYNC,
|
||||
TIME_RESOLUTION
|
||||
TIME_UTC=1
|
||||
// TIME_TAI,
|
||||
// TIME_MONOTONIC,
|
||||
// TIME_PROCESS,
|
||||
// TIME_THREAD,
|
||||
// TIME_LOCAL,
|
||||
// TIME_SYNC,
|
||||
// TIME_RESOLUTION
|
||||
};
|
||||
|
||||
struct xtime
|
||||
{
|
||||
#if defined(BOOST_NO_INT64_T)
|
||||
int_fast32_t sec;
|
||||
typedef int_fast32_t xtime_sec_t; //INT_FAST32_MIN <= sec <= INT_FAST32_MAX
|
||||
#else
|
||||
int_fast64_t sec;
|
||||
typedef int_fast64_t xtime_sec_t; //INT_FAST64_MIN <= sec <= INT_FAST64_MAX
|
||||
#endif
|
||||
int_fast32_t nsec;
|
||||
|
||||
typedef int_fast32_t xtime_nsec_t; //0 <= xtime.nsec < NANOSECONDS_PER_SECOND
|
||||
|
||||
xtime_sec_t sec;
|
||||
xtime_nsec_t nsec;
|
||||
};
|
||||
|
||||
int BOOST_THREAD_DECL xtime_get(struct xtime* xtp, int clock_type);
|
||||
|
||||
inline int xtime_cmp(const xtime& xt1, const xtime& xt2)
|
||||
{
|
||||
int res = (int)(xt1.sec - xt2.sec);
|
||||
if (res == 0)
|
||||
res = (int)(xt1.nsec - xt2.nsec);
|
||||
return res;
|
||||
if (xt1.sec == xt2.sec)
|
||||
return (int)(xt1.nsec - xt2.nsec);
|
||||
else
|
||||
return (xt1.sec > xt2.sec) ? 1 : -1;
|
||||
}
|
||||
|
||||
} // namespace boost
|
||||
|
||||
// Change Log:
|
||||
// 8 Feb 01 WEKEMPF Initial version.
|
||||
|
||||
#endif // BOOST_XTIME_WEK070601_HPP
|
||||
|
||||
#endif //BOOST_XTIME_WEK070601_HPP
|
||||
|
||||
@@ -5,4 +5,4 @@
|
||||
<body>
|
||||
Automatic redirection failed, please go to <a href="doc/index.html">doc/index.html</a>
|
||||
</body>
|
||||
</html>
|
||||
</html>
|
||||
|
||||
47
src/barrier.cpp
Normal file
47
src/barrier.cpp
Normal file
@@ -0,0 +1,47 @@
|
||||
// Copyright (C) 2002-2003
|
||||
// David Moore, William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. William E. Kempf makes no representations
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
#include <boost/thread/barrier.hpp>
|
||||
#include <string> // see http://article.gmane.org/gmane.comp.lib.boost.devel/106981
|
||||
|
||||
namespace boost {
|
||||
|
||||
barrier::barrier(unsigned int count)
|
||||
: m_threshold(count), m_count(count), m_generation(0)
|
||||
{
|
||||
if (count == 0)
|
||||
throw std::invalid_argument("count cannot be zero.");
|
||||
}
|
||||
|
||||
barrier::~barrier()
|
||||
{
|
||||
}
|
||||
|
||||
bool barrier::wait()
|
||||
{
|
||||
boost::mutex::scoped_lock lock(m_mutex);
|
||||
unsigned int gen = m_generation;
|
||||
|
||||
if (--m_count == 0)
|
||||
{
|
||||
m_generation++;
|
||||
m_count = m_threshold;
|
||||
m_cond.notify_all();
|
||||
return true;
|
||||
}
|
||||
|
||||
while (gen == m_generation)
|
||||
m_cond.wait(lock);
|
||||
return false;
|
||||
}
|
||||
|
||||
} // namespace boost
|
||||
@@ -1,4 +1,4 @@
|
||||
// Copyright (C) 2001
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
@@ -9,6 +9,8 @@
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
#include <boost/thread/condition.hpp>
|
||||
#include <boost/thread/xtime.hpp>
|
||||
#include <boost/thread/thread.hpp>
|
||||
@@ -25,9 +27,9 @@
|
||||
#elif defined(BOOST_HAS_PTHREADS)
|
||||
# include <errno.h>
|
||||
#elif defined(BOOST_HAS_MPTASKS)
|
||||
# include <MacErrors.h>
|
||||
# include "mac/init.hpp"
|
||||
# include "mac/safe.hpp"
|
||||
# include <MacErrors.h>
|
||||
# include "mac/init.hpp"
|
||||
# include "mac/safe.hpp"
|
||||
#endif
|
||||
|
||||
namespace boost {
|
||||
@@ -39,8 +41,8 @@ condition_impl::condition_impl()
|
||||
: m_gone(0), m_blocked(0), m_waiting(0)
|
||||
{
|
||||
m_gate = reinterpret_cast<void*>(CreateSemaphore(0, 1, 1, 0));
|
||||
m_queue = reinterpret_cast<void*>(CreateSemaphore(0, 0,
|
||||
std::numeric_limits<long>::max(), 0));
|
||||
m_queue = reinterpret_cast<void*>(
|
||||
CreateSemaphore(0, 0, (std::numeric_limits<long>::max)(), 0));
|
||||
m_mutex = reinterpret_cast<void*>(CreateMutex(0, 0, 0));
|
||||
|
||||
if (!m_gate || !m_queue || !m_mutex)
|
||||
@@ -168,15 +170,15 @@ void condition_impl::notify_all()
|
||||
res = ReleaseSemaphore(reinterpret_cast<HANDLE>(m_gate), 1, 0);
|
||||
assert(res);
|
||||
}
|
||||
}
|
||||
|
||||
res = ReleaseMutex(reinterpret_cast<HANDLE>(m_mutex));
|
||||
res = ReleaseMutex(reinterpret_cast<HANDLE>(m_mutex));
|
||||
assert(res);
|
||||
|
||||
if (signals)
|
||||
{
|
||||
res = ReleaseSemaphore(reinterpret_cast<HANDLE>(m_queue), signals, 0);
|
||||
assert(res);
|
||||
|
||||
if (signals)
|
||||
{
|
||||
res = ReleaseSemaphore(reinterpret_cast<HANDLE>(m_queue), signals, 0);
|
||||
assert(res);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@@ -218,7 +220,7 @@ void condition_impl::do_wait()
|
||||
m_gone = 0;
|
||||
}
|
||||
}
|
||||
else if (++m_gone == (std::numeric_limits<unsigned>::max() / 2))
|
||||
else if (++m_gone == ((std::numeric_limits<unsigned>::max)() / 2))
|
||||
{
|
||||
// timeout occured, normalize the m_gone count
|
||||
// this may occur if many calls to wait with a timeout are made and
|
||||
@@ -302,7 +304,7 @@ bool condition_impl::do_timed_wait(const xtime& xt)
|
||||
m_gone = 0;
|
||||
}
|
||||
}
|
||||
else if (++m_gone == (std::numeric_limits<unsigned>::max() / 2))
|
||||
else if (++m_gone == ((std::numeric_limits<unsigned>::max)() / 2))
|
||||
{
|
||||
// timeout occured, normalize the m_gone count
|
||||
// this may occur if many calls to wait with a timeout are made and
|
||||
@@ -427,7 +429,8 @@ void condition_impl::notify_one()
|
||||
unsigned signals = 0;
|
||||
|
||||
OSStatus lStatus = noErr;
|
||||
lStatus = safe_enter_critical_region(m_mutex, kDurationForever, m_mutex_mutex);
|
||||
lStatus = safe_enter_critical_region(m_mutex, kDurationForever,
|
||||
m_mutex_mutex);
|
||||
assert(lStatus == noErr);
|
||||
|
||||
if (m_waiting != 0) // the m_gate is already closed
|
||||
@@ -479,7 +482,8 @@ void condition_impl::notify_all()
|
||||
unsigned signals = 0;
|
||||
|
||||
OSStatus lStatus = noErr;
|
||||
lStatus = safe_enter_critical_region(m_mutex, kDurationForever, m_mutex_mutex);
|
||||
lStatus = safe_enter_critical_region(m_mutex, kDurationForever,
|
||||
m_mutex_mutex);
|
||||
assert(lStatus == noErr);
|
||||
|
||||
if (m_waiting != 0) // the m_gate is already closed
|
||||
@@ -545,7 +549,8 @@ void condition_impl::do_wait()
|
||||
unsigned was_waiting=0;
|
||||
unsigned was_gone=0;
|
||||
|
||||
lStatus = safe_enter_critical_region(m_mutex, kDurationForever, m_mutex_mutex);
|
||||
lStatus = safe_enter_critical_region(m_mutex, kDurationForever,
|
||||
m_mutex_mutex);
|
||||
assert(lStatus == noErr);
|
||||
was_waiting = m_waiting;
|
||||
was_gone = m_gone;
|
||||
@@ -563,7 +568,7 @@ void condition_impl::do_wait()
|
||||
m_gone = 0;
|
||||
}
|
||||
}
|
||||
else if (++m_gone == (std::numeric_limits<unsigned>::max() / 2))
|
||||
else if (++m_gone == ((std::numeric_limits<unsigned>::max)() / 2))
|
||||
{
|
||||
// timeout occured, normalize the m_gone count
|
||||
// this may occur if many calls to wait with a timeout are made and
|
||||
@@ -605,7 +610,8 @@ bool condition_impl::do_timed_wait(const xtime& xt)
|
||||
unsigned was_waiting=0;
|
||||
unsigned was_gone=0;
|
||||
|
||||
lStatus = safe_enter_critical_region(m_mutex, kDurationForever, m_mutex_mutex);
|
||||
lStatus = safe_enter_critical_region(m_mutex, kDurationForever,
|
||||
m_mutex_mutex);
|
||||
assert(lStatus == noErr);
|
||||
was_waiting = m_waiting;
|
||||
was_gone = m_gone;
|
||||
@@ -630,7 +636,7 @@ bool condition_impl::do_timed_wait(const xtime& xt)
|
||||
m_gone = 0;
|
||||
}
|
||||
}
|
||||
else if (++m_gone == (std::numeric_limits<unsigned>::max() / 2))
|
||||
else if (++m_gone == ((std::numeric_limits<unsigned>::max)() / 2))
|
||||
{
|
||||
// timeout occured, normalize the m_gone count
|
||||
// this may occur if many calls to wait with a timeout are made and
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
// Copyright (C) 2001
|
||||
// Copyright (C) 2001-2003
|
||||
// William E. Kempf
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
@@ -9,17 +9,179 @@
|
||||
// about the suitability of this software for any purpose.
|
||||
// It is provided "as is" without express or implied warranty.
|
||||
|
||||
#include <boost/thread/detail/config.hpp>
|
||||
|
||||
#include <boost/thread/exceptions.hpp>
|
||||
#include <cstring>
|
||||
#include <string>
|
||||
|
||||
# ifdef BOOST_NO_STDC_NAMESPACE
|
||||
namespace std { using ::strerror; }
|
||||
# endif
|
||||
|
||||
// BOOST_POSIX or BOOST_WINDOWS specify which API to use.
|
||||
# if !defined( BOOST_WINDOWS ) && !defined( BOOST_POSIX )
|
||||
# if defined(_WIN32) || defined(__WIN32__) || defined(WIN32) || defined(__CYGWIN__)
|
||||
# define BOOST_WINDOWS
|
||||
# else
|
||||
# define BOOST_POSIX
|
||||
# endif
|
||||
# endif
|
||||
|
||||
# if defined( BOOST_WINDOWS )
|
||||
# include "windows.h"
|
||||
# else
|
||||
# include <errno.h> // for POSIX error codes
|
||||
# endif
|
||||
|
||||
namespace
|
||||
{
|
||||
|
||||
std::string system_message(int sys_err_code)
|
||||
{
|
||||
std::string str;
|
||||
# ifdef BOOST_WINDOWS
|
||||
LPVOID lpMsgBuf;
|
||||
::FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
|
||||
FORMAT_MESSAGE_FROM_SYSTEM |
|
||||
FORMAT_MESSAGE_IGNORE_INSERTS,
|
||||
NULL,
|
||||
sys_err_code,
|
||||
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
|
||||
(LPSTR)&lpMsgBuf,
|
||||
0,
|
||||
NULL);
|
||||
str += static_cast<LPCSTR>(lpMsgBuf);
|
||||
::LocalFree(lpMsgBuf); // free the buffer
|
||||
while (str.size() && (str[str.size()-1] == '\n' ||
|
||||
str[str.size()-1] == '\r'))
|
||||
{
|
||||
str.erase(str.size()-1);
|
||||
}
|
||||
# else
|
||||
str += std::strerror(errno);
|
||||
# endif
|
||||
return str;
|
||||
}
|
||||
|
||||
} // unnamed namespace
|
||||
|
||||
namespace boost {
|
||||
|
||||
lock_error::lock_error() : std::logic_error("thread lock error")
|
||||
thread_exception::thread_exception()
|
||||
: m_sys_err(0)
|
||||
{
|
||||
}
|
||||
|
||||
thread_resource_error::thread_resource_error() : std::runtime_error("thread resource error")
|
||||
thread_exception::thread_exception(int sys_err_code)
|
||||
: m_sys_err(sys_err_code)
|
||||
{
|
||||
}
|
||||
|
||||
thread_exception::~thread_exception() throw()
|
||||
{
|
||||
}
|
||||
|
||||
int thread_exception::native_error() const
|
||||
{
|
||||
return m_sys_err;
|
||||
}
|
||||
|
||||
const char* thread_exception::message() const
|
||||
{
|
||||
if (m_sys_err != 0)
|
||||
return system_message(m_sys_err).c_str();
|
||||
return what();
|
||||
}
|
||||
|
||||
lock_error::lock_error()
|
||||
{
|
||||
}
|
||||
|
||||
lock_error::lock_error(int sys_err_code)
|
||||
: thread_exception(sys_err_code)
|
||||
{
|
||||
}
|
||||
|
||||
lock_error::~lock_error() throw()
|
||||
{
|
||||
}
|
||||
|
||||
const char* lock_error::what() const throw()
|
||||
{
|
||||
return "boost::lock_error";
|
||||
}
|
||||
|
||||
thread_resource_error::thread_resource_error()
|
||||
{
|
||||
}
|
||||
|
||||
thread_resource_error::thread_resource_error(int sys_err_code)
|
||||
: thread_exception(sys_err_code)
|
||||
{
|
||||
}
|
||||
|
||||
thread_resource_error::~thread_resource_error() throw()
|
||||
{
|
||||
}
|
||||
|
||||
const char* thread_resource_error::what() const throw()
|
||||
{
|
||||
return "boost::thread_resource_error";
|
||||
}
|
||||
|
||||
unsupported_thread_option::unsupported_thread_option()
|
||||
{
|
||||
}
|
||||
|
||||
unsupported_thread_option::unsupported_thread_option(int sys_err_code)
|
||||
: thread_exception(sys_err_code)
|
||||
{
|
||||
}
|
||||
|
||||
unsupported_thread_option::~unsupported_thread_option() throw()
|
||||
{
|
||||
}
|
||||
|
||||
const char* unsupported_thread_option::what() const throw()
|
||||
{
|
||||
return "boost::unsupported_thread_option";
|
||||
}
|
||||
|
||||
invalid_thread_argument::invalid_thread_argument()
|
||||
{
|
||||
}
|
||||
|
||||
invalid_thread_argument::invalid_thread_argument(int sys_err_code)
|
||||
: thread_exception(sys_err_code)
|
||||
{
|
||||
}
|
||||
|
||||
invalid_thread_argument::~invalid_thread_argument() throw()
|
||||
{
|
||||
}
|
||||
|
||||
const char* invalid_thread_argument::what() const throw()
|
||||
{
|
||||
return "boost::invalid_thread_argument";
|
||||
}
|
||||
|
||||
thread_permission_error::thread_permission_error()
|
||||
{
|
||||
}
|
||||
|
||||
thread_permission_error::thread_permission_error(int sys_err_code)
|
||||
: thread_exception(sys_err_code)
|
||||
{
|
||||
}
|
||||
|
||||
thread_permission_error::~thread_permission_error() throw()
|
||||
{
|
||||
}
|
||||
|
||||
const char* thread_permission_error::what() const throw()
|
||||
{
|
||||
return "boost::thread_permission_error";
|
||||
}
|
||||
|
||||
} // namespace boost
|
||||
|
||||
@@ -1,14 +1,8 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
#define TARGET_CARBON 1
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
#include "delivery_man.hpp"
|
||||
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
#ifndef BOOST_DELIVERY_MAN_MJM012402_HPP
|
||||
#define BOOST_DELIVERY_MAN_MJM012402_HPP
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
#include "dt_scheduler.hpp"
|
||||
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
#ifndef BOOST_DT_SCHEDULER_MJM012402_HPP
|
||||
#define BOOST_DT_SCHEDULER_MJM012402_HPP
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
#include <Debugging.h>
|
||||
#include <Multiprocessing.h>
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
#ifndef BOOST_EXECUTION_CONTEXT_MJM012402_HPP
|
||||
#define BOOST_EXECUTION_CONTEXT_MJM012402_HPP
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
#include "init.hpp"
|
||||
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
#ifndef BOOST_INIT_MJM012402_HPP
|
||||
#define BOOST_INIT_MJM012402_HPP
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
#include <cassert>
|
||||
#include <cstdio>
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
//
|
||||
// includes
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
//
|
||||
// includes
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
//
|
||||
// includes
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
#include <cassert>
|
||||
// we include timesize.mac.h to get whether or not __TIMESIZE_DOUBLE__ is
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
#include "os.hpp"
|
||||
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
#ifndef BOOST_OS_MJM012402_HPP
|
||||
#define BOOST_OS_MJM012402_HPP
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
#include "ot_context.hpp"
|
||||
|
||||
|
||||
@@ -1,15 +1,9 @@
|
||||
// Copyright (C) 2001
|
||||
// Mac Murrett
|
||||
//
|
||||
// Permission to use, copy, modify, distribute and sell this software
|
||||
// and its documentation for any purpose is hereby granted without fee,
|
||||
// provided that the above copyright notice appear in all copies and
|
||||
// that both that copyright notice and this permission notice appear
|
||||
// in supporting documentation. Mac Murrett makes no representations
|
||||
// about the suitability of this software for any purpose. It is
|
||||
// provided "as is" without express or implied warranty.
|
||||
//
|
||||
// See http://www.boost.org for most recent version including documentation.
|
||||
// (C) Copyright Mac Murrett 2001.
|
||||
// Use, modification and distribution are subject to the
|
||||
// Boost Software License, Version 1.0. (See accompanying file
|
||||
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
// See http://www.boost.org for most recent version.
|
||||
|
||||
#ifndef BOOST_OT_CONTEXT_MJM012402_HPP
|
||||
#define BOOST_OT_CONTEXT_MJM012402_HPP
|
||||
|
||||
Some files were not shown because too many files have changed in this diff Show More
Reference in New Issue
Block a user