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