QBYNDELAY
q->q_flags |= QBYNDELAY;
QBYTRACE|QBYNDELAY|QBYNRELAY)
else if (bitset(QBYNDELAY, q->q_flags))
!bitset(QBYNDELAY, q->q_flags) ||
bitset(QBYNDELAY, q->q_flags) ||