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//
// Copyright (C) 2020 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 <atomic>
#include <chrono>
#include <condition_variable>
#include <deque>
#include <functional>
#include <mutex>
#include <thread>
namespace cuttlefish {
template <typename T>
std::function<void()> makeSafeCallback(T *me, std::function<void(T *)> f) {
return [f, me] {
if (me) {
f(me);
}
};
}
template<typename T, typename... Params>
std::function<void()> makeSafeCallback(
T *obj, void (T::*f)(const Params&...), const Params&... params) {
return makeSafeCallback<T>(obj,
[f, params...](T *me) { (me->*f)(params...); });
}
template<typename T, typename... Params>
std::function<void()> makeSafeCallback(
T *obj, void (T::*f)(Params...), const Params&... params) {
return makeSafeCallback<T>(obj,
[f, params...](T *me) { (me->*f)(params...); });
}
class ThreadLooper {
public:
ThreadLooper();
~ThreadLooper();
ThreadLooper(const ThreadLooper &) = delete;
ThreadLooper &operator=(const ThreadLooper &) = delete;
typedef std::function<void()> Callback;
typedef int32_t Serial;
Serial Post(Callback cb);
Serial PostWithDelay(std::chrono::steady_clock::duration delay, Callback cb);
void Stop();
// Returns true if matching event was canceled.
bool CancelSerial(Serial serial);
private:
struct Event {
std::chrono::steady_clock::time_point when;
Callback cb;
Serial serial;
bool operator<=(const Event &other) const;
};
bool stopped_;
std::thread looper_thread_;
std::mutex lock_;
std::condition_variable cond_;
std::deque<Event> queue_;
std::atomic<Serial> next_serial_;
void ThreadLoop();
void Insert(const Event &event);
};
}; // namespace cuttlefish
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