62 lines
1.5 KiB
C++
62 lines
1.5 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_FUTEX_H
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#define BOOST_FIBERS_DETAIL_FUTEX_H
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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_OS_LINUX
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extern "C" {
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#include <linux/futex.h>
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#include <sys/syscall.h>
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}
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#elif BOOST_OS_WINDOWS
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#include <Windows.h>
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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_OS_LINUX
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inline
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int sys_futex( void * addr, std::int32_t op, std::int32_t x) {
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return ::syscall( SYS_futex, addr, op, x, nullptr, nullptr, 0);
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}
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inline
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int futex_wake( std::atomic< std::int32_t > * addr) {
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return 0 <= sys_futex( static_cast< void * >( addr), FUTEX_WAKE_PRIVATE, 1) ? 0 : -1;
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}
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inline
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int futex_wait( std::atomic< std::int32_t > * addr, std::int32_t x) {
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return 0 <= sys_futex( static_cast< void * >( addr), FUTEX_WAIT_PRIVATE, x) ? 0 : -1;
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}
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#elif BOOST_OS_WINDOWS
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inline
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int futex_wake( std::atomic< std::int32_t > * addr) {
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::WakeByAddressSingle( static_cast< void * >( addr) );
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return 0;
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}
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inline
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int futex_wait( std::atomic< std::int32_t > * addr, std::int32_t x) {
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::WaitOnAddress( static_cast< volatile void * >( addr), & x, sizeof( x), -1);
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return 0;
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}
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#else
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# warn "no futex support on this platform"
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#endif
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}}}
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#endif // BOOST_FIBERS_DETAIL_FUTEX_H
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