queue_slot
extern struct ulwp **queue_slot(queue_head_t *, struct ulwp **, int *);
while ((ulwpp = queue_slot(qp, &prev, &more)) != NULL) {
ulwpp = queue_slot(qp, &prev, &more);
if ((ulwpp = queue_slot(qp, &prev, more)) == NULL)
if ((ulwpp = queue_slot(qp, &prev, &more)) == NULL)