/*
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* Copyright (c) 2020 Andrey Semashev
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*/
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/*!
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* \file atomic/detail/fence_ops_gcc_atomic.hpp
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*
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* This header contains implementation of the \c fence_operations struct.
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*/
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#ifndef BOOST_ATOMIC_DETAIL_FENCE_OPS_GCC_ATOMIC_HPP_INCLUDED_
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#define BOOST_ATOMIC_DETAIL_FENCE_OPS_GCC_ATOMIC_HPP_INCLUDED_
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#include <boost/memory_order.hpp>
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#include <boost/atomic/detail/config.hpp>
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#include <boost/atomic/detail/fence_arch_operations.hpp>
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#include <boost/atomic/detail/gcc_atomic_memory_order_utils.hpp>
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#include <boost/atomic/detail/header.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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#if defined(__INTEL_COMPILER)
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// This is used to suppress warning #32013 described in gcc_atomic_memory_order_utils.hpp
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// for Intel Compiler.
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// In debug builds the compiler does not inline any functions, so basically
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// every atomic function call results in this warning. I don't know any other
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// way to selectively disable just this one warning.
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#pragma system_header
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#endif
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namespace boost {
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namespace atomics {
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namespace detail {
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//! Fence operations based on gcc __atomic* intrinsics
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struct fence_operations_gcc_atomic
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{
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static BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT
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{
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#if defined(__x86_64__) || defined(__i386__)
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if (order != memory_order_seq_cst)
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{
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__atomic_thread_fence(atomics::detail::convert_memory_order_to_gcc(order));
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}
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else
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{
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// gcc, clang, icc and probably other compilers generate mfence for a seq_cst fence,
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// while a dummy lock-prefixed instruction would be enough and faster. See the comment in fence_ops_gcc_x86.hpp.
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fence_arch_operations::thread_fence(order);
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}
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#else
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__atomic_thread_fence(atomics::detail::convert_memory_order_to_gcc(order));
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#endif
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}
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static BOOST_FORCEINLINE void signal_fence(memory_order order) BOOST_NOEXCEPT
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{
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__atomic_signal_fence(atomics::detail::convert_memory_order_to_gcc(order));
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}
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};
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typedef fence_operations_gcc_atomic fence_operations;
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} // namespace detail
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} // namespace atomics
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} // namespace boost
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#include <boost/atomic/detail/footer.hpp>
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#endif // BOOST_ATOMIC_DETAIL_FENCE_OPS_GCC_ATOMIC_HPP_INCLUDED_
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