LK_CANCELABLE
error = lockmgr(&cancel_lk, LK_EXCLUSIVE|LK_CANCELABLE);
if (extflags & LK_CANCELABLE) {
if (extflags & LK_CANCELABLE) {
if (extflags & LK_CANCELABLE) {
if (extflags & LK_CANCELABLE) {
if (extflags & LK_CANCELABLE) {
LK_CANCELABLE);