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

     void *PrintHello(void *threadid)
     {
        printf("\n%d: Hello World!\n", threadid);
        pthread_exit(NULL);
     }

     int main()
     {
        pthread_t threads[NUM_THREADS];
        int rc, t;
        for(t=0;t < NUM_THREADS;t++){
           printf("Creating thread %d\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);
     }