Chris@16: //////////////////////////////////////////////////////////////////////////////
Chris@16: //
Chris@16: // (C) Copyright Ion Gaztanaga 2006. Distributed under the Boost
Chris@16: // Software License, Version 1.0. (See accompanying file
Chris@16: // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // See http://www.boost.org/libs/interprocess for documentation.
Chris@16: //
Chris@16: //////////////////////////////////////////////////////////////////////////////
Chris@16: 
Chris@16: #include<boost/interprocess/exceptions.hpp>
Chris@16: #include <boost/interprocess/detail/posix_time_types_wrk.hpp>
Chris@16: #include <boost/interprocess/sync/scoped_lock.hpp>
Chris@16: 
Chris@101: #ifndef BOOST_CONFIG_HPP
Chris@101: #  include <boost/config.hpp>
Chris@101: #endif
Chris@101: #
Chris@101: #if defined(BOOST_HAS_PRAGMA_ONCE)
Chris@101: #  pragma once
Chris@101: #endif
Chris@101: 
Chris@16: namespace boost {
Chris@16: namespace interprocess {
Chris@16: 
Chris@16: inline barrier::barrier(unsigned int count)
Chris@16:    : m_threshold(count), m_count(count), m_generation(0)
Chris@16: {
Chris@16:    if (count == 0)
Chris@16:       throw std::invalid_argument("count cannot be zero.");
Chris@16: }
Chris@16: 
Chris@16: inline barrier::~barrier(){}
Chris@16: 
Chris@16: inline bool barrier::wait()
Chris@16: {
Chris@16:    scoped_lock<interprocess_mutex> lock(m_mutex);
Chris@16:    unsigned int gen = m_generation;
Chris@16: 
Chris@16:    if (--m_count == 0){
Chris@16:       m_generation++;
Chris@16:       m_count = m_threshold;
Chris@16:       m_cond.notify_all();
Chris@16:       return true;
Chris@16:    }
Chris@16: 
Chris@16:    while (gen == m_generation){
Chris@16:       m_cond.wait(lock);
Chris@16:    }
Chris@16:    return false;
Chris@16: }
Chris@16: 
Chris@16: }  //namespace interprocess {
Chris@16: }  //namespace boost {