#include <stdio.h>
#include <pthread.h>
#define NUM_THREADS 4

void *hello (void *arg) { 
	printf("Hello Thread\n"); 
}
 
main() {	
  int i; 
  pthread_t tid[NUM_THREADS];
 
  for (i = 0; i < NUM_THREADS; i++)
    pthread_create(&tid[i], NULL, hello, NULL);

  for (i = 0; i < NUM_THREADS; i++)
    pthread_join(tid[i], NULL);
}