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82 lines
1.7 KiB
82 lines
1.7 KiB
// |
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// detail/gcc_x86_fenced_block.hpp |
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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// |
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// Copyright (c) 2003-2011 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 BOOST_ASIO_DETAIL_GCC_X86_FENCED_BLOCK_HPP |
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#define BOOST_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 <boost/asio/detail/config.hpp> |
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#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) |
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#include <boost/asio/detail/push_options.hpp> |
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namespace boost { |
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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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barrier1(); |
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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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barrier2(); |
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} |
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private: |
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static int barrier1() |
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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 barrier2() |
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{ |
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#if defined(__SSE2__) |
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__asm__ __volatile__ ("mfence" ::: "memory"); |
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#else // defined(__SSE2__) |
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barrier1(); |
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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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} // namespace boost |
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#include <boost/asio/detail/pop_options.hpp> |
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#endif // defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) |
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#endif // BOOST_ASIO_DETAIL_GCC_X86_FENCED_BLOCK_HPP
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