TQ_FLAGS_BLOCKED
if ((queue->tq_flags & TQ_FLAGS_BLOCKED) == 0)
queue->tq_flags |= TQ_FLAGS_BLOCKED;
queue->tq_flags &= ~TQ_FLAGS_BLOCKED;
if ((queue->tq_flags & TQ_FLAGS_BLOCKED) == 0)
queue->tq_flags |= TQ_FLAGS_BLOCKED;
queue->tq_flags &= ~TQ_FLAGS_BLOCKED;