SELECT get_lock_pool(999,3,1);
 get_lock_pool 
---------------
             1
(1 row)

SELECT get_lock_pool(999,3);
 get_lock_pool 
---------------
             1
(1 row)

SELECT pg_advisory_unlock(999,1);
 pg_advisory_unlock 
--------------------
 t
(1 row)

BEGIN;
SELECT get_xact_lock_pool(999,3,1);
 get_xact_lock_pool 
--------------------
                  1
(1 row)

SELECT get_xact_lock_pool(999,3);
 get_xact_lock_pool 
--------------------
                  1
(1 row)

END;