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96 lines
2.3 KiB
C++
96 lines
2.3 KiB
C++
// Copyright 2013 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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// Based on
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// https://cs.chromium.org/chromium/src/v8/src/base/platform/semaphore.cc
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#include "util/semaphore.h"
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#include "base/logging.h"
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#if defined(OS_MACOSX)
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Semaphore::Semaphore(int count) {
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kern_return_t result = semaphore_create(mach_task_self(), &native_handle_,
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SYNC_POLICY_FIFO, count);
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DCHECK_EQ(KERN_SUCCESS, result);
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}
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Semaphore::~Semaphore() {
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kern_return_t result = semaphore_destroy(mach_task_self(), native_handle_);
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DCHECK_EQ(KERN_SUCCESS, result);
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}
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void Semaphore::Signal() {
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kern_return_t result = semaphore_signal(native_handle_);
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DCHECK_EQ(KERN_SUCCESS, result);
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}
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void Semaphore::Wait() {
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while (true) {
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kern_return_t result = semaphore_wait(native_handle_);
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if (result == KERN_SUCCESS)
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return; // Semaphore was signalled.
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DCHECK_EQ(KERN_ABORTED, result);
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}
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}
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#elif defined(OS_LINUX) || defined(OS_AIX)
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Semaphore::Semaphore(int count) {
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DCHECK_GE(count, 0);
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int result = sem_init(&native_handle_, 0, count);
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DCHECK_EQ(0, result);
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}
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Semaphore::~Semaphore() {
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int result = sem_destroy(&native_handle_);
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DCHECK_EQ(0, result);
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}
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void Semaphore::Signal() {
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int result = sem_post(&native_handle_);
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// This check may fail with <libc-2.21, which we use on the try bots, if the
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// semaphore is destroyed while sem_post is still executed. A work around is
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// to extend the lifetime of the semaphore.
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CHECK_EQ(0, result);
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}
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void Semaphore::Wait() {
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while (true) {
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int result = sem_wait(&native_handle_);
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if (result == 0)
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return; // Semaphore was signalled.
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// Signal caused spurious wakeup.
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DCHECK_EQ(-1, result);
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DCHECK_EQ(EINTR, errno);
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}
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}
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#elif defined(OS_WIN)
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Semaphore::Semaphore(int count) {
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DCHECK_GE(count, 0);
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native_handle_ = ::CreateSemaphoreA(nullptr, count, 0x7FFFFFFF, nullptr);
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DCHECK(native_handle_);
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}
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Semaphore::~Semaphore() {
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BOOL result = CloseHandle(native_handle_);
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DCHECK(result);
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}
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void Semaphore::Signal() {
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LONG dummy;
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BOOL result = ReleaseSemaphore(native_handle_, 1, &dummy);
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DCHECK(result);
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}
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void Semaphore::Wait() {
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DWORD result = WaitForSingleObject(native_handle_, INFINITE);
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DCHECK(result == WAIT_OBJECT_0);
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}
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#endif
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