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// Copyright Oliver Kowalke 2016.
// 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_FIBERS_DETAIL_CPU_RELAX_H
#define BOOST_FIBERS_DETAIL_CPU_RELAX_H
#include <thread>
#include <boost/config.hpp>
#include <boost/predef.h>
#include <boost/fiber/detail/config.hpp>
#if BOOST_COMP_MSVC
# include <Windows.h>
#endif
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_PREFIX
#endif
namespace boost {
namespace fibers {
namespace detail {
#if BOOST_ARCH_ARM
# if BOOST_COMP_MSVC
# define cpu_relax() YieldProcessor();
# else
# define cpu_relax() asm volatile ("yield" ::: "memory");
# endif
#elif BOOST_ARCH_MIPS
# define cpu_relax() asm volatile ("pause" ::: "memory");
#elif BOOST_ARCH_PPC
# define cpu_relax() asm volatile ("or 27,27,27" ::: "memory");
#elif BOOST_ARCH_X86
# if BOOST_COMP_MSVC
# define cpu_relax() YieldProcessor();
# else
# define cpu_relax() asm volatile ("pause" ::: "memory");
# endif
#else
# warning "architecture does not support yield/pause mnemonic"
# define cpu_relax() std::this_thread::yield();
#endif
}}}
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
#endif // BOOST_FIBERS_DETAIL_CPU_RELAX_H
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