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authorRemko Tronçon <git@el-tramo.be>2009-06-01 08:48:42 (GMT)
committerRemko Tronçon <git@el-tramo.be>2009-06-01 09:24:28 (GMT)
commit2812bddd81f8a1b804c7460f4e14cd0aa393d129 (patch)
treed46294f35150c4f0f43deaf2d31fceaf945ae715 /3rdParty/Boost/boost/thread/barrier.hpp
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+// Copyright (C) 2002-2003
+// David Moore, William E. Kempf
+// Copyright (C) 2007-8 Anthony Williams
+//
+// 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)
+
+#ifndef BOOST_BARRIER_JDM030602_HPP
+#define BOOST_BARRIER_JDM030602_HPP
+
+#include <boost/thread/detail/config.hpp>
+
+#include <boost/thread/mutex.hpp>
+#include <boost/thread/condition_variable.hpp>
+#include <string>
+#include <stdexcept>
+
+#include <boost/config/abi_prefix.hpp>
+
+namespace boost
+{
+
+ class barrier
+ {
+ public:
+ barrier(unsigned int count)
+ : m_threshold(count), m_count(count), m_generation(0)
+ {
+ if (count == 0)
+ throw std::invalid_argument("count cannot be zero.");
+ }
+
+ bool wait()
+ {
+ boost::mutex::scoped_lock lock(m_mutex);
+ unsigned int gen = m_generation;
+
+ if (--m_count == 0)
+ {
+ m_generation++;
+ m_count = m_threshold;
+ m_cond.notify_all();
+ return true;
+ }
+
+ while (gen == m_generation)
+ m_cond.wait(lock);
+ return false;
+ }
+
+ private:
+ mutex m_mutex;
+ condition_variable m_cond;
+ unsigned int m_threshold;
+ unsigned int m_count;
+ unsigned int m_generation;
+ };
+
+} // namespace boost
+
+#include <boost/config/abi_suffix.hpp>
+
+#endif