PQ_WANTED
pg->pqflags |= PQ_WANTED;
if ((pg->pqflags & PQ_WANTED) != 0) {
pg->pqflags &= ~PQ_WANTED;
if (pg->pqflags & PQ_WANTED) {
pg->pqflags &= ~PQ_WANTED;
if ((pg->pqflags & PQ_WANTED) != 0) {
pg->pqflags &= ~PQ_WANTED;
pg->pqflags |= PQ_WANTED;
if ((pg->pqflags & PQ_WANTED) != 0) {
pg->pqflags &= ~PQ_WANTED;
return (atomic_load_relaxed(&pg->pqflags) & PQ_WANTED) != 0;