PORTQ_POLLWK_PEND
while (portq->portq_flags & PORTQ_POLLWK_PEND) {
!(portq->portq_flags & PORTQ_POLLWK_PEND)) {
portq->portq_flags |= PORTQ_POLLWK_PEND;
ASSERT(portq->portq_flags & PORTQ_POLLWK_PEND);
portq->portq_flags &= ~PORTQ_POLLWK_PEND;