62 lines
1.5 KiB
C++
62 lines
1.5 KiB
C++
|
|
||
|
|
// 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
|