72 lines
1.7 KiB
C++
72 lines
1.7 KiB
C++
#ifndef BOOST_CORE_DETAIL_SP_THREAD_PAUSE_HPP_INCLUDED
|
|
#define BOOST_CORE_DETAIL_SP_THREAD_PAUSE_HPP_INCLUDED
|
|
|
|
// MS compatible compilers support #pragma once
|
|
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
|
|
# pragma once
|
|
#endif
|
|
|
|
// boost/core/detail/sp_thread_pause.hpp
|
|
//
|
|
// inline void bost::core::sp_thread_pause();
|
|
//
|
|
// Emits a "pause" instruction.
|
|
//
|
|
// Copyright 2008, 2020, 2023 Peter Dimov
|
|
// Distributed under the Boost Software License, Version 1.0
|
|
// https://www.boost.org/LICENSE_1_0.txt
|
|
|
|
#include <boost/config.hpp>
|
|
|
|
#if defined(__has_builtin)
|
|
# if __has_builtin(__builtin_ia32_pause) && !defined(_INTEL_COMPILER)
|
|
# define BOOST_CORE_HAS_BUILTIN_IA32_PAUSE
|
|
# endif
|
|
#endif
|
|
|
|
#if defined(BOOST_CORE_HAS_BUILTIN_IA32_PAUSE)
|
|
|
|
# define BOOST_CORE_SP_PAUSE() __builtin_ia32_pause()
|
|
|
|
#elif defined(_MSC_VER) && ( defined(_M_IX86) || defined(_M_X64) )
|
|
|
|
# include <intrin.h>
|
|
# define BOOST_CORE_SP_PAUSE() _mm_pause()
|
|
|
|
#elif defined(_MSC_VER) && ( defined(_M_ARM) || defined(_M_ARM64) )
|
|
|
|
# include <intrin.h>
|
|
# define BOOST_CORE_SP_PAUSE() __yield()
|
|
|
|
#elif defined(__GNUC__) && ( defined(__i386__) || defined(__x86_64__) )
|
|
|
|
# define BOOST_CORE_SP_PAUSE() __asm__ __volatile__( "rep; nop" : : : "memory" )
|
|
|
|
#elif defined(__GNUC__) && ( (defined(__ARM_ARCH) && __ARM_ARCH >= 8) || defined(__ARM_ARCH_8A__) || defined(__aarch64__) )
|
|
|
|
# define BOOST_CORE_SP_PAUSE() __asm__ __volatile__( "yield" : : : "memory" )
|
|
|
|
#else
|
|
|
|
# define BOOST_CORE_SP_PAUSE() ((void)0)
|
|
|
|
#endif
|
|
|
|
namespace boost
|
|
{
|
|
namespace core
|
|
{
|
|
|
|
BOOST_FORCEINLINE void sp_thread_pause() BOOST_NOEXCEPT
|
|
{
|
|
BOOST_CORE_SP_PAUSE();
|
|
}
|
|
|
|
} // namespace core
|
|
} // namespace boost
|
|
|
|
#undef BOOST_CORE_SP_PAUSE
|
|
|
|
#endif // #ifndef BOOST_CORE_DETAIL_SP_THREAD_PAUSE_HPP_INCLUDED
|