| // 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" |
| |
| 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(); |
| } |
| |
| } } // namespace v8::platform |