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// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/libplatform/task-queue.h"
#include "src/base/logging.h"
#include "src/base/platform/platform.h"
#include "src/base/platform/time.h"
namespace v8 {
namespace platform {
TaskQueue::TaskQueue() : process_queue_semaphore_(0), terminated_(false) {}
TaskQueue::~TaskQueue() {
base::LockGuard<base::Mutex> guard(&lock_);
DCHECK(terminated_);
DCHECK(task_queue_.empty());
}
void TaskQueue::Append(Task* task) {
base::LockGuard<base::Mutex> guard(&lock_);
DCHECK(!terminated_);
task_queue_.push(task);
process_queue_semaphore_.Signal();
}
Task* TaskQueue::GetNext() {
for (;;) {
{
base::LockGuard<base::Mutex> guard(&lock_);
if (!task_queue_.empty()) {
Task* result = task_queue_.front();
task_queue_.pop();
return result;
}
if (terminated_) {
process_queue_semaphore_.Signal();
return NULL;
}
}
process_queue_semaphore_.Wait();
}
}
void TaskQueue::Terminate() {
base::LockGuard<base::Mutex> guard(&lock_);
DCHECK(!terminated_);
terminated_ = true;
process_queue_semaphore_.Signal();
}
void TaskQueue::BlockUntilQueueEmptyForTesting() {
for (;;) {
{
base::LockGuard<base::Mutex> guard(&lock_);
if (task_queue_.empty()) return;
}
base::OS::Sleep(base::TimeDelta::FromMilliseconds(5));
}
}
} // namespace platform
} // namespace v8
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