extern zone_t ipc_labelh_zone;
#define lh_lock_init(lh) lck_mtx_init(&(lh)->lh_lock_data, &ipc_lck_grp, &ipc_lck_attr)
+#define lh_lock_destroy(lh) lck_mtx_destroy(&(lh)->lh_lock_data, &ipc_lck_grp)
#define lh_lock(lh) lck_mtx_lock(&(lh)->lh_lock_data)
#define lh_unlock(lh) lck_mtx_unlock(&(lh)->lh_lock_data)