#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#define NUM_THREADS     5

void *PrintHello(void *threadid)
{
   long tid;
   int pid;

   tid = (long)threadid;

   if (fork() == 0)   /* in child */
   {
       printf("Hello World! It's me, child in thread #%ld!\n", tid);
       sleep(10);
       printf("Good bay World! It's me, child in thread #%ld!\n", tid);
       exit(0);
   }
   sleep(5);
   printf("Good Bay World! It's me, thread #%ld!\n", tid);
   pthread_exit(NULL);
}

int main (int argc, char *argv[])
{
   pthread_t threads[NUM_THREADS];
   int rc;
   long t;
   for(t=0; t<NUM_THREADS; t++){
      printf("In main: creating thread %ld\n", t);
      rc = pthread_create(&threads[t], NULL, PrintHello, (void *)t);
      if (rc){
         printf("ERROR; return code from pthread_create() is %d\n", rc);
         exit(-1);
      }
   }
   pthread_exit(NULL);
}