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_PENDING_TASK_H_ 6 #define BASE_PENDING_TASK_H_ 7 8 #include <queue> 9 10 #include "base/base_export.h" 11 #include "base/callback.h" 12 #include "base/location.h" 13 #include "base/time/time.h" 14 #include "base/tracking_info.h" 15 16 namespace base { 17 18 // Contains data about a pending task. Stored in TaskQueue and DelayedTaskQueue 19 // for use by classes that queue and execute tasks. 20 struct BASE_EXPORT PendingTask : public TrackingInfo { 21 PendingTask(const tracked_objects::Location& posted_from, 22 Closure task); 23 PendingTask(const tracked_objects::Location& posted_from, 24 Closure task, 25 TimeTicks delayed_run_time, 26 bool nestable); 27 PendingTask(PendingTask&& other); 28 ~PendingTask(); 29 30 PendingTask& operator=(PendingTask&& other); 31 32 // Used to support sorting. 33 bool operator<(const PendingTask& other) const; 34 35 // The task to run. 36 Closure task; 37 38 // The site this PendingTask was posted from. 39 tracked_objects::Location posted_from; 40 41 // Secondary sort key for run time. 42 int sequence_num; 43 44 // OK to dispatch from a nested loop. 45 bool nestable; 46 47 // Needs high resolution timers. 48 bool is_high_res; 49 }; 50 51 using TaskQueue = std::queue<PendingTask>; 52 53 // PendingTasks are sorted by their |delayed_run_time| property. 54 using DelayedTaskQueue = std::priority_queue<base::PendingTask>; 55 56 } // namespace base 57 58 #endif // BASE_PENDING_TASK_H_ 59