100 lines
2.3 KiB
C++
100 lines
2.3 KiB
C++
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//
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// detail/gcc_x86_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_X86_FENCED_BLOCK_HPP
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#define ASIO_DETAIL_GCC_X86_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(__i386__) || defined(__x86_64__))
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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_x86_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_x86_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_x86_fenced_block(full_t)
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{
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lbarrier();
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}
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// Destructor.
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~gcc_x86_fenced_block()
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{
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sbarrier();
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}
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private:
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static int barrier()
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{
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int r = 0, m = 1;
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__asm__ __volatile__ (
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"xchgl %0, %1" :
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"=r"(r), "=m"(m) :
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"0"(1), "m"(m) :
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"memory", "cc");
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return r;
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}
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static void lbarrier()
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{
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#if defined(__SSE2__)
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# if (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
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__builtin_ia32_lfence();
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# else // (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
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__asm__ __volatile__ ("lfence" ::: "memory");
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# endif // (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
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#else // defined(__SSE2__)
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barrier();
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#endif // defined(__SSE2__)
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}
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static void sbarrier()
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{
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#if defined(__SSE2__)
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# if (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
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__builtin_ia32_sfence();
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# else // (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
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__asm__ __volatile__ ("sfence" ::: "memory");
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# endif // (__GNUC__ >= 4) && !defined(__INTEL_COMPILER) && !defined(__ICL)
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#else // defined(__SSE2__)
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barrier();
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#endif // defined(__SSE2__)
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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(__i386__) || defined(__x86_64__))
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#endif // ASIO_DETAIL_GCC_X86_FENCED_BLOCK_HPP
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