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

 void *slowthread(void *i) {
 int j=0;
 while(++j < 15){ //print Hi once every 5 seconds
 usleep(2000000);
 printf("Hi %d from slowthread\n",j);} 
}

 void *fastthread(void *i) {
 int j=0; //print Hi once every 1 second
 while(++j < 15){
 usleep(500000);
 printf("Hi %d from fastthread\n",j);} 
}

 main() {
   pthread_t thread,thread2;
  int dummy;
  pthread_create(&thread,NULL,slowthread,
                   (void *) &dummy);
  pthread_create(&thread2,NULL,fastthread,(void *)&dummy);
  //fastthread((void *) &dummy);
//wait for other thread to finish
pthread_join(thread,NULL);
pthread_join(thread2,NULL);
pthread_exit(NULL); 
}