DQ_LOCK
dq->dq_flags &= ~(DQ_MOD|DQ_LOCK|DQ_WANT);
while (dq->dq_flags & DQ_LOCK) {
while (dq->dq_flags & DQ_LOCK) {
while (dq->dq_flags & DQ_LOCK) {
while (dq->dq_flags & DQ_LOCK) {
while (dq->dq_flags & DQ_LOCK) {
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags = DQ_LOCK;
while (dq->dq_flags & DQ_LOCK) {
dq->dq_flags |= DQ_LOCK;