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/*
* Copyright 2019 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 <functional>
#include <memory>
#include <mutex>
#include "common/callback.h"
#include "os/handler.h"
#include "os/thread.h"
#include "os/utils.h"
namespace bluetooth {
namespace os {
// A single-shot alarm for reactor-based thread, implemented by Linux timerfd.
// When it's constructed, it will register a reactable on the specified thread; when it's destroyed, it will unregister
// itself from the thread.
class Alarm {
public:
// Create and register a single-shot alarm on a given handler
explicit Alarm(Handler* handler);
Alarm(const Alarm&) = delete;
Alarm& operator=(const Alarm&) = delete;
// Unregister this alarm from the thread and release resource
~Alarm();
// Schedule the alarm with given delay
void Schedule(common::OnceClosure task, std::chrono::milliseconds delay);
// Cancel the alarm. No-op if it's not armed.
void Cancel();
private:
common::OnceClosure task_;
Handler* handler_;
int fd_ = 0;
Reactor::Reactable* token_;
mutable std::mutex mutex_;
void on_fire();
};
} // namespace os
} // namespace bluetooth
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