Implementing A "Future" (Cont.)

Finally, the function used to set the value of the future:

/* set the value of the given future, */
/* notifying any waiting thread.      */
/* returns 1 on success, 0 otherwise. */
int int_future_set_value(struct int_future* f, int value)
{
  int rc = -1;  /* assume failure. */

  if (!f) {
    errno = EINVAL;
    goto int_future_set_value_ret;
  }