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91 lines
2.1 KiB
91 lines
2.1 KiB
// |
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// detail/gcc_arm_fenced_block.hpp |
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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// |
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// Copyright (c) 2003-2011 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_ARM_FENCED_BLOCK_HPP |
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#define BOOST_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 <boost/asio/detail/config.hpp> |
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#if defined(__GNUC__) && defined(__arm__) |
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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_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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} // namespace boost |
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#include <boost/asio/detail/pop_options.hpp> |
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#endif // defined(__GNUC__) && defined(__arm__) |
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#endif // BOOST_ASIO_DETAIL_GCC_ARM_FENCED_BLOCK_HPP
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