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将三个线程 循环打印三次

鱼满舱 2022-02-18 阅读 58

将三个线程 循环打印三次
用到了c++函数库里面的阻塞函数和notify_all()函数

#include <iostream>
#include <condition_variable>
#include <thread>

std::mutex mtx;
std::condition_variable cv;
int ready = 0;
void PrintString_1()
{
        std::unique_lock<std::mutex> lk(mtx);
        int cnt = 0;
        while(cnt<3)
        {
                while(ready != 0)
                        cv.wait(lk);
                std::cout<<std::this_thread::get_id()<<" : "<<"线程1"<<std::endl;
                ready = 1;
                cnt++;
                cv.notify_all();
        }
}

void PrintString_2()
{
        std::unique_lock<std::mutex> lk(mtx);
        int cnt = 0;
        while(cnt<3)
        {
                while(ready != 1)
                        cv.wait(lk);
                std::cout<<std::this_thread::get_id()<<" : "<<"线程2"<<std::endl;
                ready = 2;
                cnt++;
                cv.notify_all();
        }
}

void PrintString_3()
{
        std::unique_lock<std::mutex> lk(mtx);
        int cnt = 0;
        while(cnt<3)
        {
                while(ready != 2)
                        cv.wait(lk);
                std::cout<<std::this_thread::get_id()<<" : "<<"线程3"<<std::endl;
                ready = 0;
                cnt++;
                cv.notify_all();
        }
}

int main()
{
        std::thread  t1(PrintString_1);
        std::thread  t2(PrintString_2);
        std::thread  t3(PrintString_3);
        t1.join();
        t2.join();
        t3.join();
        return 0;
}
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