| /* |
| * 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) |
| * |
| * Copyright (c) 2020 Andrey Semashev |
| */ |
| /*! |
| * \file atomic/detail/fence_ops_gcc_sync.hpp |
| * |
| * This header contains implementation of the \c fence_operations struct. |
| */ |
| |
| #ifndef BOOST_ATOMIC_DETAIL_FENCE_OPS_GCC_SYNC_HPP_INCLUDED_ |
| #define BOOST_ATOMIC_DETAIL_FENCE_OPS_GCC_SYNC_HPP_INCLUDED_ |
| |
| #include <boost/memory_order.hpp> |
| #include <boost/atomic/detail/config.hpp> |
| #include <boost/atomic/detail/header.hpp> |
| |
| #ifdef BOOST_HAS_PRAGMA_ONCE |
| #pragma once |
| #endif |
| |
| namespace boost { |
| namespace atomics { |
| namespace detail { |
| |
| //! Fence operations based on gcc __sync* intrinsics |
| struct fence_operations_gcc_sync |
| { |
| static BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT |
| { |
| if (order != memory_order_relaxed) |
| __sync_synchronize(); |
| } |
| |
| static BOOST_FORCEINLINE void signal_fence(memory_order order) BOOST_NOEXCEPT |
| { |
| if (order != memory_order_relaxed) |
| __asm__ __volatile__ ("" ::: "memory"); |
| } |
| }; |
| |
| typedef fence_operations_gcc_sync fence_operations; |
| |
| } // namespace detail |
| } // namespace atomics |
| } // namespace boost |
| |
| #include <boost/atomic/detail/footer.hpp> |
| |
| #endif // BOOST_ATOMIC_DETAIL_FENCE_OPS_GCC_SYNC_HPP_INCLUDED_ |