atomic/detail/fence_arch_ops_gcc_aarch32.hpp

0001 /*
0002  * Distributed under the Boost Software License, Version 1.0.
0003  * (See accompanying file LICENSE_1_0.txt or copy at
0004  * http://www.boost.org/LICENSE_1_0.txt)
0005  *
0006  * Copyright (c) 2020 Andrey Semashev
0007  */
0008 /*!
0009  * \file   atomic/detail/fence_arch_ops_gcc_aarch32.hpp
0010  *
0011  * This header contains implementation of the \c fence_arch_operations struct.
0012  */
0013
0014 #ifndef BOOST_ATOMIC_DETAIL_FENCE_ARCH_OPS_GCC_AARCH32_HPP_INCLUDED_
0015 #define BOOST_ATOMIC_DETAIL_FENCE_ARCH_OPS_GCC_AARCH32_HPP_INCLUDED_
0016
0017 #include <boost/cstdint.hpp>
0018 #include <boost/memory_order.hpp>
0019 #include <boost/atomic/detail/config.hpp>
0020 #include <boost/atomic/detail/capabilities.hpp>
0021 #include <boost/atomic/detail/header.hpp>
0022
0023 #ifdef BOOST_HAS_PRAGMA_ONCE
0024 #pragma once
0025 #endif
0026
0027 namespace boost {
0028 namespace atomics {
0029 namespace detail {
0030
0031 //! Fence operations for AArch32
0032 struct fence_arch_operations_gcc_aarch32
0033 {
0034     static BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT
0035     {
0036         if (order != memory_order_relaxed)
0037         {
0038             if (order == memory_order_consume || order == memory_order_acquire)
0039                 __asm__ __volatile__ ("dmb ishld\n\t" ::: "memory");
0040             else
0041                 __asm__ __volatile__ ("dmb ish\n\t" ::: "memory");
0042         }
0043     }
0044
0045     static BOOST_FORCEINLINE void signal_fence(memory_order order) BOOST_NOEXCEPT
0046     {
0047         if (order != memory_order_relaxed)
0048             __asm__ __volatile__ ("" ::: "memory");
0049     }
0050 };
0051
0052 typedef fence_arch_operations_gcc_aarch32 fence_arch_operations;
0053
0054 } // namespace detail
0055 } // namespace atomics
0056 } // namespace boost
0057
0058 #include <boost/atomic/detail/footer.hpp>
0059
0060 #endif // BOOST_ATOMIC_DETAIL_FENCE_ARCH_OPS_GCC_AARCH32_HPP_INCLUDED_