63e88f80
 Hu Chunming
提交三方库
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/*
* 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)
*
* (C) Copyright 2013 Tim Blechmann
* (C) Copyright 2013, 2020 Andrey Semashev
*/
#ifndef BOOST_ATOMIC_DETAIL_PAUSE_HPP_INCLUDED_
#define BOOST_ATOMIC_DETAIL_PAUSE_HPP_INCLUDED_
#include <boost/atomic/detail/config.hpp>
#include <boost/atomic/detail/header.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
#if defined(_MSC_VER)
#if defined(_M_AMD64) || defined(_M_IX86)
extern "C" void _mm_pause(void);
#if defined(BOOST_MSVC)
#pragma intrinsic(_mm_pause)
#endif
#elif defined(_M_ARM64) || defined(_M_ARM)
extern "C" void __yield(void);
#if defined(BOOST_MSVC)
#pragma intrinsic(__yield)
#endif
#endif
#endif
namespace boost {
namespace atomics {
namespace detail {
BOOST_FORCEINLINE void pause() BOOST_NOEXCEPT
{
#if defined(_MSC_VER)
#if defined(_M_AMD64) || defined(_M_IX86)
_mm_pause();
#elif defined(_M_ARM64) || defined(_M_ARM)
__yield();
#endif
#elif defined(__GNUC__)
#if defined(__i386__) || defined(__x86_64__)
__asm__ __volatile__("pause;" : : : "memory");
#elif (defined(__ARM_ARCH) && __ARM_ARCH >= 8) || defined(__ARM_ARCH_8A__) || defined(__aarch64__)
__asm__ __volatile__("yield;" : : : "memory");
#endif
#endif
}
} // namespace detail
} // namespace atomics
} // namespace boost
#include <boost/atomic/detail/footer.hpp>
#endif // BOOST_ATOMIC_DETAIL_PAUSE_HPP_INCLUDED_
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