277 lines
13 KiB
Plaintext
277 lines
13 KiB
Plaintext
--
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-- ADVISORY LOCKS
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--
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SELECT oid AS datoid FROM pg_database WHERE datname = current_database() \gset
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BEGIN;
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SELECT
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pg_advisory_xact_lock(1), pg_advisory_xact_lock_shared(2),
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pg_advisory_xact_lock(1, 1), pg_advisory_xact_lock_shared(2, 2);
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pg_advisory_xact_lock | pg_advisory_xact_lock_shared | pg_advisory_xact_lock | pg_advisory_xact_lock_shared
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-----------------------+------------------------------+-----------------------+------------------------------
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(1 row)
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SELECT locktype, classid, objid, objsubid, mode, granted
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FROM pg_locks WHERE locktype = 'advisory' AND database = :datoid
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ORDER BY classid, objid, objsubid;
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locktype | classid | objid | objsubid | mode | granted
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----------+---------+-------+----------+---------------+---------
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advisory | 0 | 1 | 1 | ExclusiveLock | t
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advisory | 0 | 2 | 1 | ShareLock | t
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advisory | 1 | 1 | 2 | ExclusiveLock | t
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advisory | 2 | 2 | 2 | ShareLock | t
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(4 rows)
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-- pg_advisory_unlock_all() shouldn't release xact locks
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SELECT pg_advisory_unlock_all();
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pg_advisory_unlock_all
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------------------------
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(1 row)
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SELECT count(*) FROM pg_locks WHERE locktype = 'advisory' AND database = :datoid;
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count
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-------
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4
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(1 row)
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-- can't unlock xact locks
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SELECT
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pg_advisory_unlock(1), pg_advisory_unlock_shared(2),
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pg_advisory_unlock(1, 1), pg_advisory_unlock_shared(2, 2);
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WARNING: you don't own a lock of type ExclusiveLock
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WARNING: you don't own a lock of type ShareLock
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WARNING: you don't own a lock of type ExclusiveLock
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WARNING: you don't own a lock of type ShareLock
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pg_advisory_unlock | pg_advisory_unlock_shared | pg_advisory_unlock | pg_advisory_unlock_shared
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--------------------+---------------------------+--------------------+---------------------------
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f | f | f | f
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(1 row)
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-- automatically release xact locks at commit
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COMMIT;
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SELECT count(*) FROM pg_locks WHERE locktype = 'advisory' AND database = :datoid;
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count
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-------
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0
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(1 row)
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BEGIN;
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-- holding both session and xact locks on the same objects, xact first
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SELECT
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pg_advisory_xact_lock(1), pg_advisory_xact_lock_shared(2),
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pg_advisory_xact_lock(1, 1), pg_advisory_xact_lock_shared(2, 2);
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pg_advisory_xact_lock | pg_advisory_xact_lock_shared | pg_advisory_xact_lock | pg_advisory_xact_lock_shared
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-----------------------+------------------------------+-----------------------+------------------------------
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(1 row)
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SELECT locktype, classid, objid, objsubid, mode, granted
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FROM pg_locks WHERE locktype = 'advisory' AND database = :datoid
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ORDER BY classid, objid, objsubid;
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locktype | classid | objid | objsubid | mode | granted
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----------+---------+-------+----------+---------------+---------
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advisory | 0 | 1 | 1 | ExclusiveLock | t
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advisory | 0 | 2 | 1 | ShareLock | t
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advisory | 1 | 1 | 2 | ExclusiveLock | t
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advisory | 2 | 2 | 2 | ShareLock | t
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(4 rows)
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SELECT
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pg_advisory_lock(1), pg_advisory_lock_shared(2),
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pg_advisory_lock(1, 1), pg_advisory_lock_shared(2, 2);
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pg_advisory_lock | pg_advisory_lock_shared | pg_advisory_lock | pg_advisory_lock_shared
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------------------+-------------------------+------------------+-------------------------
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(1 row)
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ROLLBACK;
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SELECT locktype, classid, objid, objsubid, mode, granted
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FROM pg_locks WHERE locktype = 'advisory' AND database = :datoid
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ORDER BY classid, objid, objsubid;
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locktype | classid | objid | objsubid | mode | granted
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----------+---------+-------+----------+---------------+---------
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advisory | 0 | 1 | 1 | ExclusiveLock | t
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advisory | 0 | 2 | 1 | ShareLock | t
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advisory | 1 | 1 | 2 | ExclusiveLock | t
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advisory | 2 | 2 | 2 | ShareLock | t
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(4 rows)
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-- unlocking session locks
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SELECT
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pg_advisory_unlock(1), pg_advisory_unlock(1),
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pg_advisory_unlock_shared(2), pg_advisory_unlock_shared(2),
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pg_advisory_unlock(1, 1), pg_advisory_unlock(1, 1),
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pg_advisory_unlock_shared(2, 2), pg_advisory_unlock_shared(2, 2);
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WARNING: you don't own a lock of type ExclusiveLock
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WARNING: you don't own a lock of type ShareLock
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WARNING: you don't own a lock of type ExclusiveLock
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WARNING: you don't own a lock of type ShareLock
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pg_advisory_unlock | pg_advisory_unlock | pg_advisory_unlock_shared | pg_advisory_unlock_shared | pg_advisory_unlock | pg_advisory_unlock | pg_advisory_unlock_shared | pg_advisory_unlock_shared
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--------------------+--------------------+---------------------------+---------------------------+--------------------+--------------------+---------------------------+---------------------------
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t | f | t | f | t | f | t | f
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(1 row)
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SELECT count(*) FROM pg_locks WHERE locktype = 'advisory' AND database = :datoid;
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count
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-------
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0
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(1 row)
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BEGIN;
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-- holding both session and xact locks on the same objects, session first
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SELECT
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pg_advisory_lock(1), pg_advisory_lock_shared(2),
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pg_advisory_lock(1, 1), pg_advisory_lock_shared(2, 2);
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pg_advisory_lock | pg_advisory_lock_shared | pg_advisory_lock | pg_advisory_lock_shared
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------------------+-------------------------+------------------+-------------------------
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(1 row)
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SELECT locktype, classid, objid, objsubid, mode, granted
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FROM pg_locks WHERE locktype = 'advisory' AND database = :datoid
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ORDER BY classid, objid, objsubid;
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locktype | classid | objid | objsubid | mode | granted
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----------+---------+-------+----------+---------------+---------
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advisory | 0 | 1 | 1 | ExclusiveLock | t
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advisory | 0 | 2 | 1 | ShareLock | t
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advisory | 1 | 1 | 2 | ExclusiveLock | t
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advisory | 2 | 2 | 2 | ShareLock | t
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(4 rows)
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SELECT
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pg_advisory_xact_lock(1), pg_advisory_xact_lock_shared(2),
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pg_advisory_xact_lock(1, 1), pg_advisory_xact_lock_shared(2, 2);
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pg_advisory_xact_lock | pg_advisory_xact_lock_shared | pg_advisory_xact_lock | pg_advisory_xact_lock_shared
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-----------------------+------------------------------+-----------------------+------------------------------
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(1 row)
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ROLLBACK;
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SELECT locktype, classid, objid, objsubid, mode, granted
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FROM pg_locks WHERE locktype = 'advisory' AND database = :datoid
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ORDER BY classid, objid, objsubid;
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locktype | classid | objid | objsubid | mode | granted
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----------+---------+-------+----------+---------------+---------
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advisory | 0 | 1 | 1 | ExclusiveLock | t
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advisory | 0 | 2 | 1 | ShareLock | t
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advisory | 1 | 1 | 2 | ExclusiveLock | t
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advisory | 2 | 2 | 2 | ShareLock | t
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(4 rows)
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-- releasing all session locks
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SELECT pg_advisory_unlock_all();
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pg_advisory_unlock_all
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------------------------
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(1 row)
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SELECT count(*) FROM pg_locks WHERE locktype = 'advisory' AND database = :datoid;
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count
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-------
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0
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(1 row)
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BEGIN;
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-- grabbing txn locks multiple times
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SELECT
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pg_advisory_xact_lock(1), pg_advisory_xact_lock(1),
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pg_advisory_xact_lock_shared(2), pg_advisory_xact_lock_shared(2),
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pg_advisory_xact_lock(1, 1), pg_advisory_xact_lock(1, 1),
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pg_advisory_xact_lock_shared(2, 2), pg_advisory_xact_lock_shared(2, 2);
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pg_advisory_xact_lock | pg_advisory_xact_lock | pg_advisory_xact_lock_shared | pg_advisory_xact_lock_shared | pg_advisory_xact_lock | pg_advisory_xact_lock | pg_advisory_xact_lock_shared | pg_advisory_xact_lock_shared
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-----------------------+-----------------------+------------------------------+------------------------------+-----------------------+-----------------------+------------------------------+------------------------------
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(1 row)
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SELECT locktype, classid, objid, objsubid, mode, granted
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FROM pg_locks WHERE locktype = 'advisory' AND database = :datoid
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ORDER BY classid, objid, objsubid;
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locktype | classid | objid | objsubid | mode | granted
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----------+---------+-------+----------+---------------+---------
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advisory | 0 | 1 | 1 | ExclusiveLock | t
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advisory | 0 | 2 | 1 | ShareLock | t
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advisory | 1 | 1 | 2 | ExclusiveLock | t
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advisory | 2 | 2 | 2 | ShareLock | t
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(4 rows)
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COMMIT;
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SELECT count(*) FROM pg_locks WHERE locktype = 'advisory' AND database = :datoid;
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count
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-------
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0
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(1 row)
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-- grabbing session locks multiple times
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SELECT
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pg_advisory_lock(1), pg_advisory_lock(1),
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pg_advisory_lock_shared(2), pg_advisory_lock_shared(2),
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pg_advisory_lock(1, 1), pg_advisory_lock(1, 1),
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pg_advisory_lock_shared(2, 2), pg_advisory_lock_shared(2, 2);
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pg_advisory_lock | pg_advisory_lock | pg_advisory_lock_shared | pg_advisory_lock_shared | pg_advisory_lock | pg_advisory_lock | pg_advisory_lock_shared | pg_advisory_lock_shared
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------------------+------------------+-------------------------+-------------------------+------------------+------------------+-------------------------+-------------------------
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(1 row)
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SELECT locktype, classid, objid, objsubid, mode, granted
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FROM pg_locks WHERE locktype = 'advisory' AND database = :datoid
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ORDER BY classid, objid, objsubid;
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locktype | classid | objid | objsubid | mode | granted
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----------+---------+-------+----------+---------------+---------
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advisory | 0 | 1 | 1 | ExclusiveLock | t
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advisory | 0 | 2 | 1 | ShareLock | t
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advisory | 1 | 1 | 2 | ExclusiveLock | t
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advisory | 2 | 2 | 2 | ShareLock | t
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(4 rows)
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SELECT
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pg_advisory_unlock(1), pg_advisory_unlock(1),
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pg_advisory_unlock_shared(2), pg_advisory_unlock_shared(2),
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pg_advisory_unlock(1, 1), pg_advisory_unlock(1, 1),
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pg_advisory_unlock_shared(2, 2), pg_advisory_unlock_shared(2, 2);
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pg_advisory_unlock | pg_advisory_unlock | pg_advisory_unlock_shared | pg_advisory_unlock_shared | pg_advisory_unlock | pg_advisory_unlock | pg_advisory_unlock_shared | pg_advisory_unlock_shared
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--------------------+--------------------+---------------------------+---------------------------+--------------------+--------------------+---------------------------+---------------------------
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t | t | t | t | t | t | t | t
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(1 row)
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SELECT count(*) FROM pg_locks WHERE locktype = 'advisory' AND database = :datoid;
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count
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-------
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0
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(1 row)
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-- .. and releasing them all at once
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SELECT
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pg_advisory_lock(1), pg_advisory_lock(1),
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pg_advisory_lock_shared(2), pg_advisory_lock_shared(2),
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pg_advisory_lock(1, 1), pg_advisory_lock(1, 1),
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pg_advisory_lock_shared(2, 2), pg_advisory_lock_shared(2, 2);
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pg_advisory_lock | pg_advisory_lock | pg_advisory_lock_shared | pg_advisory_lock_shared | pg_advisory_lock | pg_advisory_lock | pg_advisory_lock_shared | pg_advisory_lock_shared
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------------------+------------------+-------------------------+-------------------------+------------------+------------------+-------------------------+-------------------------
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(1 row)
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SELECT locktype, classid, objid, objsubid, mode, granted
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FROM pg_locks WHERE locktype = 'advisory' AND database = :datoid
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ORDER BY classid, objid, objsubid;
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locktype | classid | objid | objsubid | mode | granted
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----------+---------+-------+----------+---------------+---------
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advisory | 0 | 1 | 1 | ExclusiveLock | t
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advisory | 0 | 2 | 1 | ShareLock | t
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advisory | 1 | 1 | 2 | ExclusiveLock | t
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advisory | 2 | 2 | 2 | ShareLock | t
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(4 rows)
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SELECT pg_advisory_unlock_all();
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pg_advisory_unlock_all
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------------------------
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(1 row)
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SELECT count(*) FROM pg_locks WHERE locktype = 'advisory' AND database = :datoid;
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count
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-------
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0
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(1 row)
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