PQ_ACTIVE
if (pg->pqflags & PQ_ACTIVE) {
pg->pqflags &= ~(PQ_ACTIVE | PQ_INTENT_SET);
pg->pqflags |= PQ_ACTIVE;
if (pg->pqflags & PQ_ACTIVE) {
pg->pqflags &= ~(PQ_ACTIVE | PQ_INACTIVE | PQ_INTENT_SET);
return (pqflags & (PQ_ACTIVE | PQ_INACTIVE)) != 0;