线程编程练习

迈不过友情╰ 2022-07-14 06:46 141阅读 0赞

编写一个程序，开启3个线程，这3个线程的ID分别为A、B、C，每个线程将自己的ID在屏幕上打印10遍，要求输出结果必须按ABC的顺序显示；如：ABCABC….依次递推。

代码如下

/*****************************************************
    copyright (C), 2014-2015, Lighting Studio. Co.,     Ltd. 
    File name锛?Author锛欽erey_Jobs    Version:0.1    Date: 
    Description锛?Funcion List: 
    *****************************************************/
    
    #include <stdio.h>
    #include<stdlib.h>
    #include<string.h>
    #include<errno.h>
    #include<pthread.h>
    #include<unistd.h>
    
    #define N 10
    
    pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
    
    pthread_cond_t condA_B = PTHREAD_COND_INITIALIZER;
    pthread_cond_t condB_C = PTHREAD_COND_INITIALIZER;
    pthread_cond_t condC_A = PTHREAD_COND_INITIALIZER;
    
    int flagA,flagB,flagC;
    
    void *funa(void *arg)
    {
    	int i = 0;
    	//printf("*********\n");
    	while(i < N)
    	{
    		pthread_mutex_lock(&mutex);
    		flagA = 1;
    	//	printf("**********\n");
    		
    		pthread_cond_wait(&condC_A,&mutex);
    		flagA = 0;
    	//	printf("*************\n");
    
    		printf("A-->%d-->%lu\n",i,pthread_self());
    
    		while(!flagB)
    		{
    			pthread_mutex_unlock(&mutex);
    			sleep(1);
    			pthread_mutex_lock(&mutex);
    		}
    
    		pthread_cond_broadcast(&condA_B);
    		pthread_mutex_unlock(&mutex);
    
    		i++;
    		sleep(1);
    	}
    
    	flagA = 1;
    
    }
    
    void *funb(void *arg)
    {
    	int i = 0;
    
    	while(i < N)
    	{
    		pthread_mutex_lock(&mutex);
    		flagB = 1;
    		pthread_cond_wait(&condA_B,&mutex);
    		flagB = 0;
    
    		printf("B-->%d-->%lu\n",i,pthread_self());
    
    		while(!flagC)
    		{
    			pthread_mutex_unlock(&mutex);
    			sleep(1);
    			pthread_mutex_lock(&mutex);
    		}
    
    		pthread_cond_broadcast(&condB_C);
    		pthread_mutex_unlock(&mutex);
    		
    		i++;
    		sleep(1);
    	}
    }
    
    void *func(void *arg)
    {
    	int i = 0;
    
    	while(i < N)
    	{
    		pthread_mutex_lock(&mutex);
    		flagC = 1;
    		pthread_cond_wait(&condB_C,&mutex);
    		flagC = 0;
    
    		printf("C-->%d-->%lu\n",i,pthread_self());
    
    		while(!flagA)
    		{
    			pthread_mutex_unlock(&mutex);
    			sleep(1);
    			pthread_mutex_lock(&mutex);
    		}
    
    		pthread_cond_broadcast(&condC_A);
    		pthread_mutex_unlock(&mutex);
    		
    		i++;
    		sleep(1);
    	}
    }
    
    int main()
    {
    	pthread_t pr1,pr2,pr3;
    
    	if(pthread_create(&pr1,NULL,funa,NULL) != 0)
    	{
    		printf("create pr1 error!\n");
    		exit(1);
    	}
    
    	if(pthread_create(&pr2,NULL,funb,NULL) != 0)
    	{
    		printf("create pr2 error!\n");
    		exit(1);
    	}
    
    	if(pthread_create(&pr3,NULL,func,NULL) != 0)
    	{
    		printf("creat2 pr3 error!\n");
    		exit(1);
    	}
    
    	//printf("***************10\n");
    	pthread_mutex_lock(&mutex);
    	while(!flagC)
    	{
    		pthread_mutex_unlock(&mutex);
    		sleep(1);
    		pthread_mutex_lock(&mutex);
    	}
    	printf("hi\n");
    	pthread_cond_broadcast(&condC_A);
    	pthread_mutex_unlock(&mutex);
    
    	pthread_join(pr1,NULL);
    	printf("finish pr1!\n");
    	pthread_join(pr2,NULL);
    	printf("finish pr2!\n");
    	pthread_join(pr3,NULL);
    	printf("finish pr3!\n");
    
    
        return 0;
    }