66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
// Copyright (C) 2002-2003
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// David Moore, William E. Kempf
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// Copyright (C) 2007-8 Anthony Williams
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_BARRIER_JDM030602_HPP
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#define BOOST_BARRIER_JDM030602_HPP
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#include <boost/thread/detail/config.hpp>
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#include <boost/throw_exception.hpp>
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#include <boost/thread/mutex.hpp>
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#include <boost/thread/lock_types.hpp>
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#include <boost/thread/condition_variable.hpp>
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#include <string>
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#include <stdexcept>
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#include <boost/config/abi_prefix.hpp>
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namespace boost
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{
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class barrier
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{
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public:
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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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boost::throw_exception(thread_exception(system::errc::invalid_argument, "barrier constructor: count cannot be zero."));
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}
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bool wait()
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{
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boost::unique_lock<boost::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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{
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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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return false;
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}
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private:
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mutex m_mutex;
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condition_variable m_cond;
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unsigned int m_threshold;
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unsigned int m_count;
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unsigned int m_generation;
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};
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} // namespace boost
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#include <boost/config/abi_suffix.hpp>
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#endif
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