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Parsed test spec with 3 sessions
starting permutation: sl1_prep upd_getlock sl1_exec upd_doupdate lk1_doforshare upd_releaselock
step sl1_prep:
PREPARE sl1_run AS SELECT id FROM test_nowait WHERE pg_advisory_lock(0) is not null FOR UPDATE NOWAIT;
step upd_getlock:
SELECT pg_advisory_lock(0);
pg_advisory_lock
----------------
(1 row)
step sl1_exec:
BEGIN ISOLATION LEVEL READ COMMITTED;
EXECUTE sl1_run;
SELECT xmin, xmax, ctid, * FROM test_nowait;
<waiting ...>
step upd_doupdate:
BEGIN ISOLATION LEVEL READ COMMITTED;
UPDATE test_nowait SET value = value WHERE id % 2 = 0;
COMMIT;
step lk1_doforshare:
BEGIN ISOLATION LEVEL READ COMMITTED;
SELECT id FROM test_nowait WHERE id % 2 = 0 FOR SHARE;
id
--
2
(1 row)
step upd_releaselock:
SELECT pg_advisory_unlock(0);
pg_advisory_unlock
------------------
t
(1 row)
step sl1_exec: <... completed>
ERROR: could not obtain lock on row in relation "test_nowait"
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