54 lines
1.2 KiB
C++
54 lines
1.2 KiB
C++
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//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2006. 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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#include<boost/interprocess/exceptions.hpp>
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#include <boost/interprocess/sync/scoped_lock.hpp>
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#ifndef BOOST_CONFIG_HPP
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# include <boost/config.hpp>
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#endif
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#
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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# pragma once
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#endif
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namespace boost {
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namespace interprocess {
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inline barrier::barrier(unsigned int count)
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: m_threshold(count), m_count(count), m_generation(0)
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{
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if (count == 0)
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throw std::invalid_argument("count cannot be zero.");
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}
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inline barrier::~barrier(){}
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inline bool barrier::wait()
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{
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scoped_lock<interprocess_mutex> lock(m_mutex);
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unsigned int gen = m_generation;
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if (--m_count == 0){
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m_generation++;
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m_count = m_threshold;
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m_cond.notify_all();
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return true;
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}
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while (gen == m_generation){
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m_cond.wait(lock);
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}
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return false;
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}
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} //namespace interprocess {
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} //namespace boost {
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