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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.
#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 {
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);
// 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;
// Needs high resolution timers.
bool is_high_res;
// Wrapper around std::queue specialized for PendingTask which adds a Swap
// helper method.
class BASE_EXPORT TaskQueue : public std::queue<PendingTask> {
void Swap(TaskQueue* queue);
// PendingTasks are sorted by their |delayed_run_time| property.
typedef std::priority_queue<base::PendingTask> DelayedTaskQueue;
} // namespace base