NEU操作系统实验课4——线程同步

实验要求：

创建两个线程按数字顺序打印10以下自然数，其中一个线程打印1-3及8-10；另一个线程打印4-6。要求使用线程同步机制实现上述打印顺序。

看网上的资料学习了两种写法

C++11的，使用了std::thread

 #include <unistd.h>
 #include <thread>
 #include <iostream>
 #include <mutex>
 #include<bits/stdc++.h>
 void Fun_1();
 void Fun_2();
 unsigned int counter=;
 std::mutex mtx;

 int main()
 {
     std::thread thrd_1(Fun_1);
     std::thread thrd_2(Fun_2);
     thrd_1.join();
     thrd_2.join();
     //system("pause");
     return ;
 }

 void Fun_1()
 {
     while(counter<){
         if(counter<||counter>)continue;
         std::lock_guard<std::mutex> mtx_locker(mtx);
         ++counter;
         std::cout << "Function 1 counting " << counter << "...\n";
         usleep();
     }
 }

 void Fun_2()
 {
     while(counter<){
         if(counter>&&counter<)continue;
         std::lock_guard<std::mutex> mtx_locker(mtx);
         ++counter;
         std::cout << "Function 2 counting " << counter << "...\n";
         usleep();
     }
 }

C++11

C语言的，使用pthread

 #include <stdio.h>
 #include <pthread.h>
 #include <stdlib.h>
 #include <unistd.h>

 pthread_mutex_t mutex;
 pthread_cond_t cond1;
 pthread_cond_t cond2;
 int cnt=;

 void hander(void *arg)
 {
     free(arg);
     (void)pthread_mutex_unlock(&mutex);
 }

 void *thread1(void *arg)
 {
     pthread_cleanup_push(hander,&mutex);
     printf("thread1\n1\n2\n3\n");
     pthread_mutex_lock(&mutex);
     pthread_cond_wait(&cond1,&mutex);
     pthread_mutex_unlock(&mutex);
     printf("thread1\n7\n8\n9\n10\n");
     pthread_cleanup_pop();
 }

 void *thread2(void *arg)
 {
     pthread_mutex_lock(&mutex);
     pthread_cond_wait(&cond2,&mutex);
     printf("thread2\n4\n5\n6\n");
     pthread_cond_signal(&cond1);
     pthread_mutex_unlock(&mutex);
 }

 int main()
 {
     pthread_t tid1,tid2;
     pthread_mutex_init(&mutex,NULL);
     pthread_cond_init(&cond1,NULL);
     pthread_cond_init(&cond2,NULL);
     pthread_create(&tid1,NULL,thread1,NULL);
     pthread_create(&tid2,NULL,thread2,NULL);

     sleep();
     pthread_cond_signal(&cond2);
     //sleep(2);
     pthread_exit();
     return ;
 }

C