/*
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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) 2009, 2011 Helge Bahmann
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* Copyright (c) 2009 Phil Endecott
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* Copyright (c) 2013 Tim Blechmann
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* Linux-specific code by Phil Endecott
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* Copyright (c) 2014 Andrey Semashev
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*/
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/*!
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* \file atomic/detail/fence_ops_linux_arm.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_LINUX_ARM_HPP_INCLUDED_
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#define BOOST_ATOMIC_DETAIL_FENCE_OPS_LINUX_ARM_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/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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namespace boost {
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namespace atomics {
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namespace detail {
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//! Fence operations based on Linux-specific system routines
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struct fence_operations_linux_arm
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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 (order != memory_order_relaxed)
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hardware_full_fence();
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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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if (order != memory_order_relaxed)
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__asm__ __volatile__ ("" ::: "memory");
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}
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static BOOST_FORCEINLINE void hardware_full_fence() BOOST_NOEXCEPT
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{
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// See the comment in core_ops_linux_arm.hpp regarding the function pointer below
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typedef void (*kernel_dmb_t)(void);
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((kernel_dmb_t)0xffff0fa0)();
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}
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};
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typedef fence_operations_linux_arm 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_LINUX_ARM_HPP_INCLUDED_
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