123 lines
3.7 KiB
C++
123 lines
3.7 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2005-2009. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/interprocess for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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//
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// Parts of the pthread code come from Boost Threads code:
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//
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//////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001-2003
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// William E. Kempf
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//
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// Permission to use, copy, modify, distribute and sell this software
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// and its documentation for any purpose is hereby granted without fee,
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// provided that the above copyright notice appear in all copies and
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// that both that copyright notice and this permission notice appear
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// in supporting documentation. William E. Kempf makes no representations
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// about the suitability of this software for any purpose.
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// It is provided "as is" without express or implied warranty.
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//////////////////////////////////////////////////////////////////////////////
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#include <boost/interprocess/sync/posix/ptime_to_timespec.hpp>
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#include <boost/interprocess/detail/posix_time_types_wrk.hpp>
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#include <boost/interprocess/exceptions.hpp>
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#ifndef BOOST_INTERPROCESS_POSIX_TIMEOUTS
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# include <boost/interprocess/detail/os_thread_functions.hpp>
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#endif
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#include <boost/assert.hpp>
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namespace boost {
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namespace interprocess {
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inline interprocess_recursive_mutex::interprocess_recursive_mutex()
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{
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ipcdetail::mutexattr_wrapper mut_attr(true);
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ipcdetail::mutex_initializer mut(m_mut, mut_attr);
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mut.release();
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}
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inline interprocess_recursive_mutex::~interprocess_recursive_mutex()
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{
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int res = pthread_mutex_destroy(&m_mut);
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BOOST_ASSERT(res == 0);(void)res;
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}
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inline void interprocess_recursive_mutex::lock()
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{
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#ifdef BOOST_INTERPROCESS_ENABLE_TIMEOUT_WHEN_LOCKING
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boost::posix_time::ptime wait_time
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= boost::posix_time::microsec_clock::universal_time()
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+ boost::posix_time::milliseconds(BOOST_INTERPROCESS_TIMEOUT_WHEN_LOCKING_DURATION_MS);
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if (!timed_lock(wait_time))
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{
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throw interprocess_exception(timeout_when_locking_error, "Interprocess mutex timeout when locking. Possible deadlock: owner died without unlocking?");
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}
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#else
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if (pthread_mutex_lock(&m_mut) != 0)
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throw lock_exception();
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#endif
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}
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inline bool interprocess_recursive_mutex::try_lock()
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{
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int res = pthread_mutex_trylock(&m_mut);
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if (!(res == 0 || res == EBUSY))
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throw lock_exception();
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return res == 0;
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}
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inline bool interprocess_recursive_mutex::timed_lock(const boost::posix_time::ptime &abs_time)
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{
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if(abs_time == boost::posix_time::pos_infin){
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this->lock();
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return true;
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}
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#ifdef BOOST_INTERPROCESS_POSIX_TIMEOUTS
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timespec ts = ipcdetail::ptime_to_timespec(abs_time);
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int res = pthread_mutex_timedlock(&m_mut, &ts);
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if (res != 0 && res != ETIMEDOUT)
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throw lock_exception();
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return res == 0;
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#else //BOOST_INTERPROCESS_POSIX_TIMEOUTS
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//Obtain current count and target time
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boost::posix_time::ptime now = microsec_clock::universal_time();
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if(now >= abs_time) return false;
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do{
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if(this->try_lock()){
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break;
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}
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now = microsec_clock::universal_time();
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if(now >= abs_time){
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return false;
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}
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// relinquish current time slice
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ipcdetail::thread_yield();
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}while (true);
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return true;
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#endif //BOOST_INTERPROCESS_POSIX_TIMEOUTS
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}
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inline void interprocess_recursive_mutex::unlock()
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{
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int res = 0;
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res = pthread_mutex_unlock(&m_mut);
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BOOST_ASSERT(res == 0);
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}
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} //namespace interprocess {
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} //namespace boost {
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