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author | Anas Nashif <anas.nashif@intel.com> | 2012-10-30 12:57:26 -0700 |
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committer | Anas Nashif <anas.nashif@intel.com> | 2012-10-30 12:57:26 -0700 |
commit | 1a78a62555be32868418fe52f8e330c9d0f95d5a (patch) | |
tree | d3765a80e7d3b9640ec2e930743630cd6b9fce2b /boost/thread/barrier.hpp | |
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Imported Upstream version 1.49.0upstream/1.49.0
Diffstat (limited to 'boost/thread/barrier.hpp')
-rw-r--r-- | boost/thread/barrier.hpp | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/boost/thread/barrier.hpp b/boost/thread/barrier.hpp new file mode 100644 index 0000000000..4ca30cb4df --- /dev/null +++ b/boost/thread/barrier.hpp @@ -0,0 +1,64 @@ +// 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/throw_exception.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) + boost::throw_exception(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 |