mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-24 14:26:09 +03:00
81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
// Copyright 2016 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 BASE_TASK_TASK_SCHEDULER_DELAYED_TASK_MANAGER_H_
|
|
#define BASE_TASK_TASK_SCHEDULER_DELAYED_TASK_MANAGER_H_
|
|
|
|
#include <memory>
|
|
#include <utility>
|
|
#include <vector>
|
|
|
|
#include "base/base_export.h"
|
|
#include "base/callback.h"
|
|
#include "base/macros.h"
|
|
#include "base/memory/ptr_util.h"
|
|
#include "base/memory/ref_counted.h"
|
|
#include "base/synchronization/atomic_flag.h"
|
|
#include "base/task/task_scheduler/scheduler_lock.h"
|
|
#include "base/time/default_tick_clock.h"
|
|
#include "base/time/tick_clock.h"
|
|
|
|
namespace base {
|
|
|
|
class TaskRunner;
|
|
|
|
namespace internal {
|
|
|
|
struct Task;
|
|
|
|
// The DelayedTaskManager forwards tasks to post task callbacks when they become
|
|
// ripe for execution. Tasks are not forwarded before Start() is called. This
|
|
// class is thread-safe.
|
|
class BASE_EXPORT DelayedTaskManager {
|
|
public:
|
|
// Posts |task| for execution immediately.
|
|
using PostTaskNowCallback = OnceCallback<void(Task task)>;
|
|
|
|
// |tick_clock| can be specified for testing.
|
|
DelayedTaskManager(std::unique_ptr<const TickClock> tick_clock =
|
|
std::make_unique<DefaultTickClock>());
|
|
~DelayedTaskManager();
|
|
|
|
// Starts the delayed task manager, allowing past and future tasks to be
|
|
// forwarded to their callbacks as they become ripe for execution.
|
|
// |service_thread_task_runner| posts tasks to the TaskScheduler service
|
|
// thread.
|
|
void Start(scoped_refptr<TaskRunner> service_thread_task_runner);
|
|
|
|
// Schedules a call to |post_task_now_callback| with |task| as argument when
|
|
// |task| is ripe for execution and Start() has been called.
|
|
void AddDelayedTask(Task task, PostTaskNowCallback post_task_now_callback);
|
|
|
|
private:
|
|
// Schedules a call to |post_task_now_callback| with |task| as argument when
|
|
// |delay| expires. Start() must have been called before this.
|
|
void AddDelayedTaskNow(Task task,
|
|
TimeDelta delay,
|
|
PostTaskNowCallback post_task_now_callback);
|
|
|
|
const std::unique_ptr<const TickClock> tick_clock_;
|
|
|
|
AtomicFlag started_;
|
|
|
|
// Synchronizes access to all members below before |started_| is set. Once
|
|
// |started_| is set:
|
|
// - |service_thread_task_runner| doest not change, so it can be read without
|
|
// holding the lock.
|
|
// - |tasks_added_before_start_| isn't accessed anymore.
|
|
SchedulerLock lock_;
|
|
|
|
scoped_refptr<TaskRunner> service_thread_task_runner_;
|
|
std::vector<std::pair<Task, PostTaskNowCallback>> tasks_added_before_start_;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(DelayedTaskManager);
|
|
};
|
|
|
|
} // namespace internal
|
|
} // namespace base
|
|
|
|
#endif // BASE_TASK_TASK_SCHEDULER_DELAYED_TASK_MANAGER_H_
|