#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

void _sleep(unsigned int t){
        struct timeval tm;
        tm.tv_sec = t;
        tm.tv_usec = 0;

        select(0,NULL,NULL,NULL,&tm);
}
void* t1(void* a){
        pid_t t = getpid();
        printf("pid = %d\n",t);

        printf("thread %d begins\n",pthread_self());
//      sleep(10);
        _sleep(10);
        printf("thread %d ends\n",pthread_self());
}

void* t2(void* a){
        pid_t t = getpid();
        printf("pid = %d\n",t);

        int i = 0;
        printf("thread %d begins\n",pthread_self());
        for(; i < 10 ;++i){
                printf("thread %d is running\n",pthread_self());
                //sleep(1);
                _sleep(1);
        }
}
int main(){
        pthread_t tid1;
        pthread_t tid2;

        pthread_create(&tid1,NULL,t1,NULL);
        pthread_create(&tid2,NULL,t2,NULL);
        pthread_join(tid1,NULL);
        pthread_join(tid2,NULL);
}