SE_DELETED
if ((pp->p_selock & ~SE_EWANTED) == SE_DELETED) {
} else if ((old & ~SE_EWANTED) == SE_DELETED) {
} else if ((old & ~SE_EWANTED) == SE_DELETED) {
ASSERT((pp->p_selock & ~SE_EWANTED) != SE_DELETED);
pp->p_selock = SE_DELETED;
return (pp->p_selock == SE_DELETED);