57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
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// Copyright Oliver Kowalke 2016.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_FIBERS_DETAIL_CPU_RELAX_H
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#define BOOST_FIBERS_DETAIL_CPU_RELAX_H
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#include <thread>
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#include <boost/config.hpp>
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#include <boost/predef.h>
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#include <boost/fiber/detail/config.hpp>
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#if BOOST_COMP_MSVC
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# include <Windows.h>
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#endif
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_PREFIX
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#endif
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namespace boost {
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namespace fibers {
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namespace detail {
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#if BOOST_ARCH_ARM
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# if BOOST_COMP_MSVC
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# define cpu_relax() YieldProcessor();
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# else
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# define cpu_relax() asm volatile ("yield" ::: "memory");
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# endif
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#elif BOOST_ARCH_MIPS
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# define cpu_relax() asm volatile ("pause" ::: "memory");
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#elif BOOST_ARCH_PPC
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# define cpu_relax() asm volatile ("or 27,27,27" ::: "memory");
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#elif BOOST_ARCH_X86
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# if BOOST_COMP_MSVC
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# define cpu_relax() YieldProcessor();
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# else
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# define cpu_relax() asm volatile ("pause" ::: "memory");
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# endif
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#else
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# warning "architecture does not support yield/pause mnemonic"
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# define cpu_relax() std::this_thread::yield();
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#endif
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}}}
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_SUFFIX
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#endif
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#endif // BOOST_FIBERS_DETAIL_CPU_RELAX_H
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