Chris@16: //
Chris@16: // detail/gcc_sync_fenced_block.hpp
Chris@16: // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Chris@16: //
Chris@101: // Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com)
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: 
Chris@16: #ifndef BOOST_ASIO_DETAIL_GCC_SYNC_FENCED_BLOCK_HPP
Chris@16: #define BOOST_ASIO_DETAIL_GCC_SYNC_FENCED_BLOCK_HPP
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16: # pragma once
Chris@16: #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16: 
Chris@16: #include <boost/asio/detail/config.hpp>
Chris@16: 
Chris@16: #if defined(__GNUC__) \
Chris@16:   && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)) \
Chris@16:   && !defined(__INTEL_COMPILER) && !defined(__ICL) \
Chris@16:   && !defined(__ICC) && !defined(__ECC) && !defined(__PATHSCALE__)
Chris@16: 
Chris@16: #include <boost/asio/detail/push_options.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace asio {
Chris@16: namespace detail {
Chris@16: 
Chris@16: class gcc_sync_fenced_block
Chris@16:   : private noncopyable
Chris@16: {
Chris@16: public:
Chris@16:   enum half_or_full_t { half, full };
Chris@16: 
Chris@16:   // Constructor.
Chris@16:   explicit gcc_sync_fenced_block(half_or_full_t)
Chris@16:     : value_(0)
Chris@16:   {
Chris@16:     __sync_lock_test_and_set(&value_, 1);
Chris@16:   }
Chris@16: 
Chris@16:   // Destructor.
Chris@16:   ~gcc_sync_fenced_block()
Chris@16:   {
Chris@16:     __sync_lock_release(&value_);
Chris@16:   }
Chris@16: 
Chris@16: private:
Chris@16:   int value_;
Chris@16: };
Chris@16: 
Chris@16: } // namespace detail
Chris@16: } // namespace asio
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #include <boost/asio/detail/pop_options.hpp>
Chris@16: 
Chris@16: #endif // defined(__GNUC__)
Chris@16:        // && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4))
Chris@16:        // && !defined(__INTEL_COMPILER) && !defined(__ICL)
Chris@16:        // && !defined(__ICC) && !defined(__ECC) && !defined(__PATHSCALE__)
Chris@16: 
Chris@16: #endif // BOOST_ASIO_DETAIL_GCC_SYNC_FENCED_BLOCK_HPP