#include <pthread.h>
#include <stdio.h>
int check_me = 0;
void* func(void* data) {check_me = 42; return &check_me;}
int main()
 {
   pthread_t t;
   void *ret;
   pthread_create (&t, 0, func, 0);
   pthread_join (t, &ret);
   return (check_me != 42 || ret != &check_me);
}