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// bthread - A M:N threading library to make applications more concurrent.
// Copyright (c) 2012 Baidu, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Author: Ge,Jun (gejun@baidu.com)
// Date: Tue Jul 10 17:40:58 CST 2012
#ifndef BTHREAD_SYS_FUTEX_H
#define BTHREAD_SYS_FUTEX_H
#include "butil/build_config.h" // OS_MACOSX
#include <unistd.h> // syscall
#include <time.h> // timespec
#if defined(OS_LINUX)
#include <syscall.h> // SYS_futex
#include <linux/futex.h> // FUTEX_WAIT, FUTEX_WAKE
namespace bthread {
#ifndef FUTEX_PRIVATE_FLAG
#define FUTEX_PRIVATE_FLAG 128
#endif
inline int futex_wait_private(
void* addr1, int expected, const timespec* timeout) {
return syscall(SYS_futex, addr1, (FUTEX_WAIT | FUTEX_PRIVATE_FLAG),
expected, timeout, NULL, 0);
}
inline int futex_wake_private(void* addr1, int nwake) {
return syscall(SYS_futex, addr1, (FUTEX_WAKE | FUTEX_PRIVATE_FLAG),
nwake, NULL, NULL, 0);
}
inline int futex_requeue_private(void* addr1, int nwake, void* addr2) {
return syscall(SYS_futex, addr1, (FUTEX_REQUEUE | FUTEX_PRIVATE_FLAG),
nwake, NULL, addr2, 0);
}
} // namespace bthread
#elif defined(OS_MACOSX)
namespace bthread {
int futex_wait_private(void* addr1, int expected, const timespec* timeout);
int futex_wake_private(void* addr1, int nwake);
int futex_requeue_private(void* addr1, int nwake, void* addr2);
} // namespace bthread
#else
#error "Unsupported OS"
#endif
#endif // BTHREAD_SYS_FUTEX_H