IO process to create a thread

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

void *my_thread(void *arg) // callback function call back
{

int num = 5;

while(1) {
	printf("func %s   %d \n", __func__, __LINE__);
	sleep(1);
	num--;
	if(num == 0) 
		break;
}

return NULL;  // 线程退出 

}

int main(int argc, const char *argv[])
{

pthread_t  tid;

int ret = pthread_create(&tid, NULL, my_thread, NULL);
if(ret != 0) {
	perror("pthread_create");
	return -1;
}


while(1) {  // 不要让进程死掉

	printf("%s %d \n", __func__, __LINE__);
	sleep(1);

}

return 0;

}