Simple Threads

#include<stdio.h>
#include<unistd.h>
#include<pthread.h>
  
void *threadfn1(void *p)
{
    while(1)
    {
        puts("thread1");
        sleep(1);
    }
    return NULL;
}
  
void *threadfn2(void *p)
{
    while(1)
    {
        sleep(1);
        puts("thread2");
    }
    return NULL;
}
  
int main()
{
    pthread_t t1,t2;
    pthread_create(&t1,NULL,threadfn1,NULL);
    pthread_create(&t2,NULL,threadfn2,NULL);
    sleep(10);
    while(1)
    {
        sleep(1);
        puts("end test");
    }
    pthread_exit(NULL);
    return 0;
}