1#include <pthread.h>
2#include <unistd.h>
3
4static void *th(void *v)
5{
6	sleep(1);
7	pthread_exit(0);
8}
9
10int main()
11{
12	pthread_t a;
13
14	pthread_create(&a, NULL, th, NULL);
15	pthread_create(&a, NULL, th, NULL);
16	pthread_create(&a, NULL, th, NULL);
17	pthread_create(&a, NULL, th, NULL);
18
19	pthread_exit(0);
20}
21