threadret.c

创建新线程

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

void *create(void *arg)
{
//int *num;
//=(int *)arg;
//num=(int *)arg;
printf("New thread is created\n");   //%s后需要char*形
return (void *)2;
}

int main(int argc, char* argv[])
{
pthread_t tpid;                      //argv中保存的是字符串
int error;
void *param;
//int *num;
//int num=(int) argv[1];
//printf("%d",argv[1]);
//int *param=&num;
//char* test="Wang zhao yang";
//int *attr=&test;
error=pthread_create(&tpid,NULL,create,NULL);
//error=pthread_create(&tpid,NULL,create,param);
if(error!=0)
{
printf("Thread is not created.\n");
return -1;
}

pthread_join(tpid,&param);                 //段错误为存储或引用问题

if(error!=0)
{
printf("The thread is not created.\n");
return -2;
}

printf("The thread is exit code %d\n",(int)param);               //*****
sleep(1);
printf("The thread is created.\n");
return 0;
}