docs: def next_timer_delta(self):
          "Returns a timevalue that the proactor will wait on."
          if self.timeouts and not self.active:
              now = getnow()
              timo = self.timeouts[0].timeout
              if now >= timo:
                  #looks like we've exceded the time
                  return 0
              else:
                  return (timo - now)
          else:
              if self.active:
                  return 0
              else:
                  return None