1// Copyright 2013 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef V8_LIBPLATFORM_TASK_QUEUE_H_
6#define V8_LIBPLATFORM_TASK_QUEUE_H_
7
8#include <memory>
9#include <queue>
10
11#include "include/libplatform/libplatform-export.h"
12#include "src/base/macros.h"
13#include "src/base/platform/mutex.h"
14#include "src/base/platform/semaphore.h"
15#include "testing/gtest/include/gtest/gtest_prod.h"  // nogncheck
16
17namespace v8 {
18
19class Task;
20
21namespace platform {
22
23class V8_PLATFORM_EXPORT TaskQueue {
24 public:
25  TaskQueue();
26  ~TaskQueue();
27
28  TaskQueue(const TaskQueue&) = delete;
29  TaskQueue& operator=(const TaskQueue&) = delete;
30
31  // Appends a task to the queue. The queue takes ownership of |task|.
32  void Append(std::unique_ptr<Task> task);
33
34  // Returns the next task to process. Blocks if no task is available. Returns
35  // nullptr if the queue is terminated.
36  std::unique_ptr<Task> GetNext();
37
38  // Terminate the queue.
39  void Terminate();
40
41 private:
42  FRIEND_TEST(WorkerThreadTest, PostSingleTask);
43
44  void BlockUntilQueueEmptyForTesting();
45
46  base::Semaphore process_queue_semaphore_;
47  base::Mutex lock_;
48  std::queue<std::unique_ptr<Task>> task_queue_;
49  bool terminated_;
50};
51
52}  // namespace platform
53}  // namespace v8
54
55
56#endif  // V8_LIBPLATFORM_TASK_QUEUE_H_
57