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- //
- // detail/gcc_sync_fenced_block.hpp
- // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2019 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 BOOST_ASIO_DETAIL_GCC_SYNC_FENCED_BLOCK_HPP
- #define BOOST_ASIO_DETAIL_GCC_SYNC_FENCED_BLOCK_HPP
- #if defined(_MSC_VER) && (_MSC_VER >= 1200)
- # pragma once
- #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
- #include <boost/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 <boost/asio/detail/noncopyable.hpp>
- #include <boost/asio/detail/push_options.hpp>
- namespace boost {
- 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
- } // namespace boost
- #include <boost/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 // BOOST_ASIO_DETAIL_GCC_SYNC_FENCED_BLOCK_HPP
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