source: CIVL/examples/fairness/unfair1.cvl

/* This program has no non-terminating fair execution */
#include <stdio.h>

int x=0;

void f() {
  printf("bye\n");
  x=1;
}

int main() {
  $proc p1 = $spawn f();
  while (x==0) {
    printf("hi\n");
  }
  $wait(p1);
}