PLIMITF_EXCLUSIVE
if (count & PLIMITF_EXCLUSIVE) {
atomic_clear_int(&olimit->p_refcnt, PLIMITF_EXCLUSIVE);
if ((count & PLIMITF_EXCLUSIVE) == 0) {
atomic_set_int(&olimit->p_refcnt, PLIMITF_EXCLUSIVE);
if ((count & PLIMITF_EXCLUSIVE) == 0) {
atomic_set_int(&olimit->p_refcnt, PLIMITF_EXCLUSIVE);
if ((count & ~PLIMITF_EXCLUSIVE) == 1) {