mirror of
https://github.com/boostorg/fiber.git
synced 2026-02-10 11:22:37 +00:00
118 lines
2.5 KiB
C++
118 lines
2.5 KiB
C++
|
|
// Copyright Oliver Kowalke 2013.
|
|
// 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)
|
|
|
|
#include "boost/fiber/recursive_mutex.hpp"
|
|
|
|
#include <algorithm>
|
|
|
|
#include <boost/assert.hpp>
|
|
|
|
#include "boost/fiber/scheduler.hpp"
|
|
#include "boost/fiber/interruption.hpp"
|
|
#include "boost/fiber/operations.hpp"
|
|
|
|
#ifdef BOOST_HAS_ABI_HEADERS
|
|
# include BOOST_ABI_PREFIX
|
|
#endif
|
|
|
|
namespace boost {
|
|
namespace fibers {
|
|
|
|
bool
|
|
recursive_mutex::lock_if_unlocked_() {
|
|
if ( mutex_status::unlocked == state_) {
|
|
state_ = mutex_status::locked;
|
|
BOOST_ASSERT( ! owner_);
|
|
owner_ = this_fiber::get_id();
|
|
++count_;
|
|
return true;
|
|
} else if ( this_fiber::get_id() == owner_) {
|
|
++count_;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
recursive_mutex::recursive_mutex() :
|
|
splk_(),
|
|
state_( mutex_status::unlocked),
|
|
owner_(),
|
|
count_( 0),
|
|
waiting_() {
|
|
}
|
|
|
|
recursive_mutex::~recursive_mutex() {
|
|
BOOST_ASSERT( ! owner_);
|
|
BOOST_ASSERT( 0 == count_);
|
|
BOOST_ASSERT( waiting_.empty() );
|
|
}
|
|
|
|
void
|
|
recursive_mutex::lock() {
|
|
context * f( context::active() );
|
|
BOOST_ASSERT( nullptr != f);
|
|
for (;;) {
|
|
detail::spinlock_lock lk( splk_);
|
|
|
|
if ( lock_if_unlocked_() ) {
|
|
return;
|
|
}
|
|
|
|
// store this fiber in order to be notified later
|
|
BOOST_ASSERT( ! f->wait_is_linked() );
|
|
waiting_.push_back( * f);
|
|
|
|
// suspend this fiber
|
|
context::active()->do_wait( lk);
|
|
}
|
|
}
|
|
|
|
bool
|
|
recursive_mutex::try_lock() {
|
|
detail::spinlock_lock lk( splk_);
|
|
|
|
if ( lock_if_unlocked_() ) {
|
|
return true;
|
|
}
|
|
|
|
lk.unlock();
|
|
|
|
// let other fiber release the lock
|
|
this_fiber::yield();
|
|
return false;
|
|
}
|
|
|
|
void
|
|
recursive_mutex::unlock() {
|
|
BOOST_ASSERT( mutex_status::locked == state_);
|
|
BOOST_ASSERT( this_fiber::get_id() == owner_);
|
|
|
|
detail::spinlock_lock lk( splk_);
|
|
context * f( nullptr);
|
|
if ( 0 == --count_) {
|
|
if ( ! waiting_.empty() ) {
|
|
f = & waiting_.front();
|
|
waiting_.pop_front();
|
|
BOOST_ASSERT( nullptr != f);
|
|
}
|
|
owner_ = context::id();
|
|
state_ = mutex_status::unlocked;
|
|
lk.unlock();
|
|
|
|
if ( nullptr != f) {
|
|
BOOST_ASSERT( ! f->is_terminated() );
|
|
f->set_ready();
|
|
}
|
|
}
|
|
}
|
|
|
|
}}
|
|
|
|
#ifdef BOOST_HAS_ABI_HEADERS
|
|
# include BOOST_ABI_SUFFIX
|
|
#endif
|