PORTQ_ALERT
if (portq->portq_flags & PORTQ_ALERT) {
portq->portq_flags |= PORTQ_ALERT;
portq->portq_flags &= ~PORTQ_ALERT;
if (portq->portq_flags & PORTQ_ALERT) {
if ((portq->portq_flags & PORTQ_ALERT) &&
portq->portq_flags &= ~PORTQ_ALERT;