PARKFLAG_ONQUEUE1
KASSERT(park->park_flags & PARKFLAG_ONQUEUE1);
park->park_flags &= ~PARKFLAG_ONQUEUE1;
park->park_flags |= PARKFLAG_ONQUEUE1;
if (park->park_flags & PARKFLAG_ONQUEUE1) {
park->park_flags &= ~PARKFLAG_ONQUEUE1;
KASSERT(park->park_flags & PARKFLAG_ONQUEUE1);
park->park_flags &= ~PARKFLAG_ONQUEUE1;