PORTQ_WAIT_EVENTS
if (((portq->portq_flags & PORTQ_WAIT_EVENTS) == 0) &&
!((portq)->portq_flags & PORTQ_WAIT_EVENTS)))
portq->portq_flags |= PORTQ_WAIT_EVENTS; /* detect incoming events */
portq->portq_flags &= ~PORTQ_WAIT_EVENTS;