main.c

int main () {
  pthread_t thread1, thread2;
  char message1[] = "I am thread 1";
  char message2[] = "I am thread 2";
  int numero = 102;
  int iret1, iret2;

  pthread_attr_t attr;

  pthread_attr_init(&attr);
  pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);

  iret1 = pthread_create (&thread1, &attr, print_function2, (void *) numero);
  iret2 = pthread_create (&thread2, &attr, print_function, (void *) message2);

  pthread_attr_destroy(&attr);

  fprintf (stdout, "Before\n");
  fflush (stdout);

  pthread_join (thread1, NULL);
  pthread_join (thread2, NULL);

  fprintf (stdout, "After\n");
  fflush (stdout);

  exit(0);
}