c++定时器执行任务

 

//
// Created by leoxae on 19-9-2.
//

#ifndef KEEKOAIROBOT_TIMERTASKHELPER_H
#define KEEKOAIROBOT_TIMERTASKHELPER_H

#include
#include
#include
#include
#include
#include
#include
class Timer{
public:
    Timer() :expired_(true), try_to_expire_(false){
    }

    Timer(const Timer& t){
        expired_ = t.expired_.load();
        try_to_expire_ = t.try_to_expire_.load();
    }
    ~Timer(){
        Expire();
        //      std::cout << "timer destructed!" << std::endl;
    }

    void StartTimer(int interval, std::function task){
        if (expired_ == false){
            //          std::cout << "timer is currently running, please expire it first..." << std::endl;
            return;
        }
        expired_ = false;
        std::thread([this, interval, task](){
            while (!try_to_expire_){
                std::this_thread::sleep_for(std::chrono::milliseconds(interval));
                task();
            }
            //          std::cout << "stop task..." << std::endl;
            {
                std::lock_guard locker(mutex_);
                expired_ = true;
                expired_cond_.notify_one();
            }
        }).detach();
    }

    void Expire(){
        if (expired_){
            return;
        }

        if (try_to_expire_){
            //          std::cout << "timer is trying to expire, please wait..." << std::endl;
            return;
        }
        try_to_expire_ = true;
        {
            std::unique_lock locker(mutex_);
            expired_cond_.wait(locker, [this]{return expired_ == true; });
            if (expired_ == true){
                //              std::cout << "timer expired!" << std::endl;
                try_to_expire_ = false;
            }
        }
    }

    template
    void SyncWait(int after, callable&& f, arguments&&... args){

        std::function::type()> task
                (std::bind(std::forward(f), std::forward(args)...));
        std::this_thread::sleep_for(std::chrono::milliseconds(after));
        task();
    }
    template
    void AsyncWait(int after, callable&& f, arguments&&... args){
        std::function::type()> task
                (std::bind(std::forward(f), std::forward(args)...));

        std::thread([after, task](){
            std::this_thread::sleep_for(std::chrono::milliseconds(after));
            task();
        }).detach();
    }

private:
    std::atomic expired_;
    std::atomic try_to_expire_;
    std::mutex mutex_;
    std::condition_variable expired_cond_;
};
#endif  //KEEKOAIROBOT_TIMERTASKHELPER_H

 

调用函数()

void timeTask(){
    Timer t;
    //周期性执行定时任务
//    t.StartTimer(1000, std::bind(EchoFunc,"hello world!"));

    cout << "开始识别==>>>>>" ;
    for (int i = 0; i <= 100; i++){
        cout << "第" << i << "张识别结果为:" << endl;
//        t.StartTimer(1000,std::bind(zbarRec,i));
        t.StartTimer(2000,std::bind(rec_NInstr,i));
//        t.StartTimer(1000,std::bind(rapidjson3));
        std::this_thread::sleep_for(std::chrono::seconds(2));
//        std::this_thread::sleep_for(std::chrono::milliseconds(500));
        t.Expire();
        cout << ">>>>>>>" << endl;
    }
//    t.StartTimer(250,std::bind(zbarRec,i+1));
//    std::this_thread::sleep_for(std::chrono::seconds(1));
//    t.Expire();
    std::cout << "try to expire timer!" << std::endl;

//    //周期性执行定时任务
//    t.StartTimer(1000, std::bind(EchoFunc,  "hello c++11!"));
//    std::this_thread::sleep_for(std::chrono::seconds(4));
//    std::cout << "try to expire timer!" << std::endl;
//    t.Expire();

//    std::this_thread::sleep_for(std::chrono::seconds(2));

    //只执行一次定时任务
    //同步
//    t.SyncWait(1000, EchoFunc, "hello world!");
    //异步
//    t.AsyncWait(1000, EchoFunc, "hello c++11!");

    std::this_thread::sleep_for(std::chrono::seconds(2));
}

 

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