content/renderer/scheduler/task_queue_selector.h

   1 // Copyright 2014 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 CONTENT_RENDERER_SCHEDULER_TASK_QUEUE_SELECTOR_H_
   6 #define CONTENT_RENDERER_SCHEDULER_TASK_QUEUE_SELECTOR_H_
   7
   8 #include <vector>
   9
  10 #include "base/basictypes.h"
  11
  12 namespace base {
  13 class TaskQueue;
  14 }
  15
  16 namespace content {
  17
  18 class TaskQueueSelector {
  19  public:
  20   virtual ~TaskQueueSelector() {}
  21
  22   // Called once to register the work queues to be selected from. This function
  23   // is called on the main thread.
  24   virtual void RegisterWorkQueues(
  25       const std::vector<const base::TaskQueue*>& work_queues) = 0;
  26
  27   // Called to choose the work queue from which the next task should be taken
  28   // and run. Return true if |out_queue| indicates the queue to service or
  29   // false to avoid running any task.
  30   //
  31   // This function is called on the main thread.
  32   virtual bool SelectWorkQueueToService(size_t* out_queue_index) = 0;
  33 };
  34
  35 }  // namespace content
  36
  37 #endif  // CONTENT_RENDERER_SCHEDULER_TASK_QUEUE_SELECTOR_H_