// | |
// detail/gcc_arm_fenced_block.hpp | |
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
// | |
// Copyright (c) 2003-2011 Christopher M. Kohlhoff (chris at kohlhoff dot com) | |
// | |
// Distributed under the Boost Software License, Version 1.0. (See accompanying | |
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
// | |
#ifndef BOOST_ASIO_DETAIL_GCC_ARM_FENCED_BLOCK_HPP | |
#define BOOST_ASIO_DETAIL_GCC_ARM_FENCED_BLOCK_HPP | |
#if defined(_MSC_VER) && (_MSC_VER >= 1200) | |
# pragma once | |
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200) | |
#include <boost/asio/detail/config.hpp> | |
#if defined(__GNUC__) && defined(__arm__) | |
#include <boost/asio/detail/push_options.hpp> | |
namespace boost { | |
namespace asio { | |
namespace detail { | |
class gcc_arm_fenced_block | |
: private noncopyable | |
{ | |
public: | |
// Constructor. | |
gcc_arm_fenced_block() | |
{ | |
barrier(); | |
} | |
// Destructor. | |
~gcc_arm_fenced_block() | |
{ | |
barrier(); | |
} | |
private: | |
static void barrier() | |
{ | |
#if defined(__ARM_ARCH_4__) \ | |
|| defined(__ARM_ARCH_4T__) \ | |
|| defined(__ARM_ARCH_5__) \ | |
|| defined(__ARM_ARCH_5E__) \ | |
|| defined(__ARM_ARCH_5T__) \ | |
|| defined(__ARM_ARCH_5TE__) \ | |
|| defined(__ARM_ARCH_5TEJ__) \ | |
|| defined(__ARM_ARCH_6__) \ | |
|| defined(__ARM_ARCH_6J__) \ | |
|| defined(__ARM_ARCH_6K__) \ | |
|| defined(__ARM_ARCH_6Z__) \ | |
|| defined(__ARM_ARCH_6ZK__) \ | |
|| defined(__ARM_ARCH_6T2__) | |
int a = 0, b = 0; | |
__asm__ __volatile__ ("swp %0, %1, [%2]" | |
: "=&r"(a) : "r"(1), "r"(&b) : "memory", "cc"); | |
#else | |
// ARMv7 and later. | |
__asm__ __volatile__ ("dmb" : : : "memory"); | |
#endif | |
} | |
}; | |
} // namespace detail | |
} // namespace asio | |
} // namespace boost | |
#include <boost/asio/detail/pop_options.hpp> | |
#endif // defined(__GNUC__) && defined(__arm__) | |
#endif // BOOST_ASIO_DETAIL_GCC_ARM_FENCED_BLOCK_HPP |