//扩展作业--参数传递

//思路: 当子线程退出的时候,pthread_exit((void *)88)--->传递给主线程 pthread_join(tid,(void *)&ret1)

//函数---参数

#include <pthread.h>

#include <stdio.h>

#include <unistd.h>

#include <stdlib.h>

#include <string.h>

void *task1(void *arg)   //子线程1的任务

{

int task1_arg = *(int *)arg;

sleep(3);

printf("task1 comming\r\n");

printf("arg = %d\r\n",task1_arg);

pthread_exit((void *)88);  //pthread_exit(void *retval);

}

void *task2(void *arg)   //子线程2的任务

{

int task2_arg = *(int *)arg;

printf("task2 comming\r\n");

printf("arg = %d\r\n",task2_arg);

//pthread_exit((void *)100);

pthread_exit("hello world!\n");

}

int main(void)

{

int task1_arg = 6, task2_arg = 8;

int ret1;

int ret2;

void *thread_rs;

//创建对应的线程

pthread_t tid1 , tid2;

pthread_create(&tid1,NULL,task1,&task1_arg);

pthread_create(&tid2,NULL,task2,&task2_arg);

//作用：等待对应的子进程运行结束pthread_join(pthread_t thread,void **retval)

pthread_join(tid1,(void *)&ret1);

printf("ret1 = %d\r\n",(int)ret1);

//pthread_join(tid2,(void *)&ret2);

//printf("ret2 = %d\r\n",(int)ret2);

pthread_join(tid2,&thread_rs);

printf("thread finished value:%s\n",(char *)thread_rs);

sleep(1);

exit(0);

}