task-queue.h

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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.
 
#ifndef V8_LIBPLATFORM_TASK_QUEUE_H_
#define V8_LIBPLATFORM_TASK_QUEUE_H_
 
#include <memory>
#include <queue>
 
#include "include/libplatform/libplatform-export.h"
#include "src/base/platform/mutex.h"
#include "src/base/platform/semaphore.h"
#include "testing/gtest/include/gtest/gtest_prod.h"  // nogncheck
 
namespace v8 {
 
class Task;
 
namespace platform {
 
class V8_PLATFORM_EXPORT TaskQueue {
 public:
  TaskQueue();
  ~TaskQueue();
 
  TaskQueue(const TaskQueue&) = delete;
  TaskQueue& operator=(const TaskQueue&) = delete;
 
  // Appends a task to the queue. The queue takes ownership of |task|.
  void Append(std::unique_ptr<Task> task);
 
  // Returns the next task to process. Blocks if no task is available. Returns
  // nullptr if the queue is terminated.
  std::unique_ptr<Task> GetNext();
 
  // Terminate the queue.
  void Terminate();
 
 private:
  FRIEND_TEST(WorkerThreadTest, PostSingleTask);
 
  void BlockUntilQueueEmptyForTesting();
 
  base::Semaphore process_queue_semaphore_;
  base::Mutex lock_;
  std::queue<std::unique_ptr<Task>> task_queue_;
  bool terminated_;
};
 
}  // namespace platform
}  // namespace v8
 
 
#endif  // V8_LIBPLATFORM_TASK_QUEUE_H_