DOOR_UNREF_ACTIVE
if (dp->door_flags & DOOR_UNREF_ACTIVE)
dp->door_flags |= DOOR_UNREF_ACTIVE;
ASSERT(dp->door_flags & DOOR_UNREF_ACTIVE);
dp->door_flags &= ~DOOR_UNREF_ACTIVE;
dp->door_flags |= DOOR_UNREF_ACTIVE;
ASSERT(dp->door_flags & DOOR_UNREF_ACTIVE);
dp->door_flags &= ~DOOR_UNREF_ACTIVE;