You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
92 lines
2.5 KiB
92 lines
2.5 KiB
/*
|
|
* Copyright 2018 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <base/bind.h>
|
|
#include <base/cancelable_callback.h>
|
|
#include <base/location.h>
|
|
#include <future>
|
|
|
|
namespace bluetooth {
|
|
|
|
namespace common {
|
|
|
|
class MessageLoopThread;
|
|
|
|
/**
|
|
* An alarm clock that posts a delayed task to a specified MessageLoopThread
|
|
* once.
|
|
*
|
|
* Warning: MessageLoopThread must be running when any task is scheduled or
|
|
* being executed
|
|
*/
|
|
class OnceTimer final {
|
|
public:
|
|
OnceTimer() {}
|
|
~OnceTimer();
|
|
|
|
/**
|
|
* Schedule a delayed task to the MessageLoopThread. Only one task can be
|
|
* scheduled at a time. If another task is scheduled, it will cancel the
|
|
* previous task synchronously and schedule the new task; this blocks until
|
|
* the previous task is cancelled.
|
|
*
|
|
* @param thread thread to run the task
|
|
* @param from_here location where this task is originated
|
|
* @param task task created through base::Bind()
|
|
* @param delay delay for the task to be executed
|
|
* @return true iff task is scheduled successfully
|
|
*/
|
|
bool Schedule(const base::WeakPtr<MessageLoopThread>& thread,
|
|
const base::Location& from_here, base::OnceClosure task,
|
|
base::TimeDelta delay);
|
|
|
|
/**
|
|
* Post an event which cancels the current task asynchronously
|
|
*/
|
|
void Cancel();
|
|
|
|
/**
|
|
* Post an event which cancels the current task and wait for the cancellation
|
|
* to be completed
|
|
*/
|
|
void CancelAndWait();
|
|
|
|
/**
|
|
* Returns true when there is a pending task scheduled on a running thread,
|
|
* otherwise false.
|
|
*/
|
|
bool IsScheduled() const;
|
|
|
|
private:
|
|
base::WeakPtr<MessageLoopThread> message_loop_thread_;
|
|
base::CancelableOnceClosure task_wrapper_;
|
|
base::OnceClosure task_;
|
|
base::TimeDelta delay_;
|
|
mutable std::recursive_mutex api_mutex_;
|
|
void CancelHelper(std::promise<void> promise);
|
|
void CancelClosure(std::promise<void> promise);
|
|
|
|
void RunTask();
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(OnceTimer);
|
|
};
|
|
|
|
} // namespace common
|
|
|
|
} // namespace bluetooth
|