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//
// detail/gcc_sync_fenced_block.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// 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 ASIO_DETAIL_GCC_SYNC_FENCED_BLOCK_HPP
#define ASIO_DETAIL_GCC_SYNC_FENCED_BLOCK_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#if defined(__GNUC__) \
&& ((__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)) \
&& !defined(__INTEL_COMPILER) && !defined(__ICL) \
&& !defined(__ICC) && !defined(__ECC) && !defined(__PATHSCALE__)
#include "asio/detail/noncopyable.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
class gcc_sync_fenced_block
: private noncopyable
{
public:
enum half_or_full_t { half, full };
// Constructor.
explicit gcc_sync_fenced_block(half_or_full_t)
: value_(0)
{
__sync_lock_test_and_set(&value_, 1);
}
// Destructor.
~gcc_sync_fenced_block()
{
__sync_lock_release(&value_);
}
private:
int value_;
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // defined(__GNUC__)
// && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4))
// && !defined(__INTEL_COMPILER) && !defined(__ICL)
// && !defined(__ICC) && !defined(__ECC) && !defined(__PATHSCALE__)
#endif // ASIO_DETAIL_GCC_SYNC_FENCED_BLOCK_HPP
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