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