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that use it are valid. Merged revisions 53047-53048 via svnmerge from https://svn.boost.org/svn/boost/trunk ........ r53047 | danieljames | 2009-05-16 15:17:20 +0100 (Sat, 16 May 2009) | 1 line Fix some validation errors. ........ r53048 | danieljames | 2009-05-16 15:23:59 +0100 (Sat, 16 May 2009) | 1 line Use a local copy of the valid HTML 4.01 icon. ........ [SVN r53258]
183 lines
4.5 KiB
HTML
183 lines
4.5 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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"http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Language" content="en-us">
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<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
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<link href="../pool.css" rel="stylesheet" type="text/css">
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<title>mutex - Mutex</title>
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</head>
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<body>
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<img src="../../../../boost.png" width="276" height="86" alt="C++ Boost">
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<h1 align="center">mutex - Mutex</h1>
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<h2>Introduction</h2>
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<p>detail/mutex.hpp provides several mutex types that provide a consistent
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interface for OS-supplied mutex types. These are all thread-level mutexes;
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interprocess mutexes are not supported.</p>
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<h2>Configuration</h2>
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<p>This header file will try to guess what kind of system it is on. It will
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auto-configure itself for Win32 or POSIX+pthread systems. To stub out all
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mutex code, bypassing the auto-configuration, <span class="code">#define
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BOOST_NO_MT</span> before any inclusion of this header. To prevent ODR
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violations, this should be defined in <strong>every</strong> translation
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unit in your project, including any library files.</p>
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<h2>Synopsis</h2>
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<pre class="code">
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namespace details {
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namespace pool {
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// Only present if on a Win32 system
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class Win32_mutex
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{
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private:
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Win32_mutex(const Win32_mutex &);
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void operator=(const Win32_mutex &);
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public:
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Win32_mutex();
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~Win32_mutex();
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void lock();
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void unlock();
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};
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// Only present if on a POSIX+pthread system
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class pthread_mutex
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{
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private:
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pthread_mutex(const pthread_mutex &);
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void operator=(const pthread_mutex &);
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public:
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pthread_mutex();
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~pthread_mutex();
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void lock();
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void unlock();
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};
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// Present on all systems
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class null_mutex
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{
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private:
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null_mutex(const null_mutex &);
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void operator=(const null_mutex &);
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public:
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null_mutex();
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~null_mutex();
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static void lock();
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static void unlock();
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};
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// This will be one of the types above
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typedef ... default_mutex;
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} // namespace pool
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} // namespace details
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</pre>
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<h2>Semantics</h2>
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<table border align="center" summary="">
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<caption>
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<em>Symbol Table</em>
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</caption>
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<tr>
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<th>Symbol</th>
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<th>Meaning</th>
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</tr>
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<tr>
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<td class="code">Mutex</td>
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<td>Any type defined in this header</td>
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</tr>
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<tr>
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<td class="code">t</td>
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<td>value of type <span class="code">Mutex</span></td>
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</tr>
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</table><br>
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<table border align="center" summary="">
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<caption>
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<em>Requirements satisfied by <span class="code">mutex</span></em>
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</caption>
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<tr>
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<th>Expression</th>
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<th>Return Type</th>
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<th>Assertion/Note/Pre/Post-Condition</th>
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</tr>
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<tr>
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<td class="code">m.lock()</td>
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<td>not used</td>
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<td>Locks the mutex</td>
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</tr>
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<tr>
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<td class="code">m.unlock()</td>
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<td>not used</td>
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<td>Unlocks the mutex</td>
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</tr>
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</table>
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<p>Each mutex is always either owned or unowned. If owned, then it is owned
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by a particular thread. To "lock" a mutex means to wait until the mutex is
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unowned, and then make it owned by the current thread. To "unlock" a mutex
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means to release ownership from the current thread (note that the current
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thread <strong>must</strong> own the mutex to release that ownership!). As
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a special case, the <span class="code">null_mutex</span> never waits.</p>
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<h2>Dependencies</h2>
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<p>May include the system headers <span class=
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"code"><windows.h></span>, <span class=
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"code"><unistd.h></span>, and/or <span class=
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"code"><pthread.h></span>.</p>
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<h2>Future Directions</h2>
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<p>This header will eventually be replaced by a Boost multithreading
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library.</p>
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<hr>
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<p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
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"../../../../doc/images/valid-html401.png" alt="Valid HTML 4.01 Transitional"
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height="31" width="88"></a></p>
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<p>Revised
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<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->05
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December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38516" --></p>
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<p><i>Copyright © 2000, 2001 Stephen Cleary (scleary AT jerviswebb DOT
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com)</i></p>
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<p><i>Distributed under the Boost Software License, Version 1.0. (See
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accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a>
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or copy at <a href=
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"http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
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</body>
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</html>
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