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 // Copyright (c) 2011 The Chromium 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 PENDING_TASK_H_

 #define PENDING_TASK_H_

 #include <queue>

 #include "base/base_export.h"

 #include "base/callback.h"

 #include "base/location.h"

 #include "base/time/time.h"

 #include "base/tracking_info.h"

 namespace base {

 // Contains data about a pending task. Stored in TaskQueue and DelayedTaskQueue

 // for use by classes that queue and execute tasks.

 struct BASE_EXPORT PendingTask : public TrackingInfo {

 #if _MSC_VER >= 1700

   PendingTask();

 #endif

   PendingTask(const tracked_objects::Location& posted_from,

               const Closure& task);

   PendingTask(const tracked_objects::Location& posted_from,

               const Closure& task,

               TimeTicks delayed_run_time,

               bool nestable);

   ~PendingTask();

   // Used to support sorting.

   bool operator<(const PendingTask& other) const;

   // The task to run.

   Closure task;

   // The site this PendingTask was posted from.

   tracked_objects::Location posted_from;

   // Secondary sort key for run time.

   int sequence_num;

   // OK to dispatch from a nested loop.

   bool nestable;

 };

 // Wrapper around std::queue specialized for PendingTask which adds a Swap

 // helper method.

 class BASE_EXPORT TaskQueue : public std::queue<PendingTask> {

  public:

   void Swap(TaskQueue* queue);

 };

 // PendingTasks are sorted by their |delayed_run_time| property.

 typedef std::priority_queue<base::PendingTask> DelayedTaskQueue;

 }  // namespace base

 #endif  // PENDING_TASK_H_