Linux--多线程之线程连接pthread_join

末蓝、 2022-07-14 08:24 238阅读 0赞

#include "apue.h"
    /**
    1.main函数的线程称为初始线程或主线程，主线程在main函数返回的时候，会导致
    整个线程结束。可以在主线程中使用pthread_exit函数 退出主线程 如此，
    进程会等待所有的线程结束时候才终止
    
    当一个线程被pthread_join之后 另外一个线程不能再pthread_join它
    */
    struct person{
    	int age;
    	char name[10];
    };
    
    void *thread_fun(void *person1){
    	int i;
    	for(i=0;i<5;i++){
    	printf("fun1 age =%d name=%s \n",((struct person*)person1)->age,((struct person*)person1)->name);
    	sleep(1);
    	}
    	printf(" fun 1  ended\n");
    	return (void *)1;
    }
    
    void *thread_fun2(void *person1){
    	int i;
    	for(i=0;i<5;i++){
    	printf("fun2 age =%d name=%s \n",((struct person*)person1)->age,((struct person*)person1)->name);
    	sleep(2);
    	}
    	printf(" fun 2  ended\n");
    	return (void *)2;
    }
    
     int main(){
    	pthread_t tid1,tid2;
    	int err1,err2;
    	
    	//初始化结构体1
    	struct person per;
    	per.age = 20;
    	strcpy(per.name,"liu pan");
    	
    	//初始化结构体2
    	struct person per2;
    	per2.age = 18;
    	strcpy(per2.name,"li si");
    	
    	//创建线程
    	err1 = pthread_create(&tid1,NULL,thread_fun,&per);
    	err2 = pthread_create(&tid2,NULL,thread_fun2,&per2);
    	
    	if(err1||err2){//err1或者err2不等于0时
    		perror(" fail to create thread ");
    		return -1;
    	}
    	printf("success to create thread err1 =%d err2 =%d\n ",err1,err2);
    	printf("pid1 = %lu  tid2 =  %lu \n",tid1,tid2);
    	
    	//连接线程
    	void *rval,*rval2;
        pthread_join(tid1,&rval);
    	pthread_join(tid2,&rval2);
    	printf("rval = %d  rval2 =  %d \n",(int)rval,(int)rval2);//打印线程函数返回值
    	
    	printf("start to quit main thread \n ");
    	//主线程退出
    	pthread_exit(NULL);//always succeeds
    }