92 lines
2.1 KiB
C++
92 lines
2.1 KiB
C++
//
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// detail/gcc_arm_fenced_block.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_DETAIL_GCC_ARM_FENCED_BLOCK_HPP
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#define ASIO_DETAIL_GCC_ARM_FENCED_BLOCK_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#if defined(__GNUC__) && defined(__arm__)
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#include "asio/detail/noncopyable.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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class gcc_arm_fenced_block
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: private noncopyable
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{
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public:
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enum half_t { half };
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enum full_t { full };
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// Constructor for a half fenced block.
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explicit gcc_arm_fenced_block(half_t)
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{
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}
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// Constructor for a full fenced block.
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explicit gcc_arm_fenced_block(full_t)
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{
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barrier();
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}
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// Destructor.
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~gcc_arm_fenced_block()
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{
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barrier();
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}
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private:
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static void barrier()
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{
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#if defined(__ARM_ARCH_4__) \
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|| defined(__ARM_ARCH_4T__) \
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|| defined(__ARM_ARCH_5__) \
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|| defined(__ARM_ARCH_5E__) \
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|| defined(__ARM_ARCH_5T__) \
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|| defined(__ARM_ARCH_5TE__) \
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|| defined(__ARM_ARCH_5TEJ__) \
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|| defined(__ARM_ARCH_6__) \
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|| defined(__ARM_ARCH_6J__) \
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|| defined(__ARM_ARCH_6K__) \
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|| defined(__ARM_ARCH_6Z__) \
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|| defined(__ARM_ARCH_6ZK__) \
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|| defined(__ARM_ARCH_6T2__)
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# if defined(__thumb__)
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// This is just a placeholder and almost certainly not sufficient.
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__asm__ __volatile__ ("" : : : "memory");
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# else // defined(__thumb__)
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int a = 0, b = 0;
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__asm__ __volatile__ ("swp %0, %1, [%2]"
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: "=&r"(a) : "r"(1), "r"(&b) : "memory", "cc");
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# endif // defined(__thumb__)
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#else
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// ARMv7 and later.
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__asm__ __volatile__ ("dmb" : : : "memory");
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#endif
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}
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};
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // defined(__GNUC__) && defined(__arm__)
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#endif // ASIO_DETAIL_GCC_ARM_FENCED_BLOCK_HPP
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