1 // Copyright (c) 2011 The Chromium 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 BASE_TASK_QUEUE_H_ 6 #define BASE_TASK_QUEUE_H_ 7 #pragma once 8 9 #include <deque> 10 11 #include "base/base_api.h" 12 #include "base/task.h" 13 14 // A TaskQueue is a queue of tasks waiting to be run. To run the tasks, call 15 // the Run method. A task queue is itself a Task so that it can be placed in a 16 // message loop or another task queue. 17 class BASE_API TaskQueue : public Task { 18 public: 19 TaskQueue(); 20 ~TaskQueue(); 21 22 // Push the specified task onto the queue. When the queue is run, the tasks 23 // will be run in the order they are pushed. 24 // 25 // This method takes ownership of |task| and will delete task after it is run 26 // (or when the TaskQueue is destroyed, if we never got a chance to run it). 27 void Push(Task* task); 28 29 // Remove all tasks from the queue. The tasks are deleted. 30 void Clear(); 31 32 // Returns true if this queue contains no tasks. 33 bool IsEmpty() const; 34 35 // Run all the tasks in the queue. New tasks pushed onto the queue during 36 // a run will be run next time |Run| is called. 37 virtual void Run(); 38 39 private: 40 // The list of tasks we are waiting to run. 41 std::deque<Task*> queue_; 42 }; 43 44 #endif // BASE_TASK_QUEUE_H_ 45