xref: /base/telephony/call_manager/utils/include/timer.h

/*
 * Copyright (C) 2021 Huawei Device Co., Ltd.
 * 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.
 */

#ifndef TELEPHONY_TIMER_H
#define TELEPHONY_TIMER_H

#include <atomic>
#include <chrono>
#include <condition_variable>
#include <functional>
#include <memory>
#include <mutex>
#include <thread>

#include "telephony_log_wrapper.h"

namespace OHOS {
namespace Telephony {
static constexpr const char* TIMER_START_THREAD = "timerStartThread";

class Timer {
public:
    Timer() : stopStatus_(true), tryStopFlag_(false) {}

    Timer(const Timer &timer)
    {
        stopStatus_ = timer.stopStatus_.load();
        tryStopFlag_ = timer.tryStopFlag_.load();
    }

    ~Timer()
    {
        stop();
    }

    void start(int interval, std::function<void()> taskFun)
    {
        if (stopStatus_ == false) {
            return;
        }
        stopStatus_ = false;
        std::thread([this, interval, taskFun]() {
            pthread_setname_np(pthread_self(), TIMER_START_THREAD);
            while (!tryStopFlag_) {
                std::this_thread::sleep_for(std::chrono::milliseconds(interval));
                taskFun();
            }
            std::lock_guard<std::mutex> locker(mutex_);
            stopStatus_ = true;
            tryStopFlag_ = false;
            timerCond_.notify_one();
        }).detach();
    }

    void stop()
    {
        if (stopStatus_ || tryStopFlag_) {
            return;
        }
        tryStopFlag_ = true;
        {
            std::unique_lock<std::mutex> locker(mutex_);
            timerCond_.wait(locker, [this] { return stopStatus_ == true; });

            if (stopStatus_ == true)
                tryStopFlag_ = false;
        }
    }

    void ThreadExit()
    {
        std::lock_guard<std::mutex> locker(mutex_);
        stopStatus_ = true;
        tryStopFlag_ = true;
    }

private:
    std::atomic<bool> stopStatus_;
    std::atomic<bool> tryStopFlag_;
    std::mutex mutex_;
    std::condition_variable timerCond_;
};
} // namespace Telephony
} // namespace OHOS
#endif // TELEPHONY_TIMER_H