
This reverts commit 0180bd6180511875db046bf8ddcaa633a2952dfd. contrib/userlock is gone, but user-level locking still exists, and is exposed via the pg_advisory* family of functions.
This reverts commit 0180bd6180511875db046bf8ddcaa633a2952dfd. contrib/userlock is gone, but user-level locking still exists, and is exposed via the pg_advisory* family of functions.