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

void *thread_function1(void * arg)
{
    int i;
    for ( i=0; i<3; i++ )
    {
        printf("exc f1 \n");
        sleep(1);
    }
    return NULL;
}

int main(void)
{
    pthread_t thread1;
    pthread_create( & thread1,NULL , thread_function1,NULL);
    for( int j=0;j< 5;j++){
        printf("main th %d \n",j);
        sleep(1);
    }
    exit(0);
}