38 lines
1.3 KiB
Python
38 lines
1.3 KiB
Python
setup {
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DROP TABLE IF EXISTS pktab;
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CREATE TABLE pktab (id int PRIMARY KEY, data SERIAL NOT NULL);
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INSERT INTO pktab VALUES (1, DEFAULT);
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}
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teardown {
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DROP TABLE pktab;
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}
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session s1
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step s1_advlock {
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SELECT pg_advisory_lock(142857),
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pg_advisory_lock(285714),
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pg_advisory_lock(571428);
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}
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step s1_chain { UPDATE pktab SET data = DEFAULT; }
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step s1_begin { BEGIN; }
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step s1_grablock { SELECT * FROM pktab FOR KEY SHARE; }
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step s1_advunlock1 { SELECT pg_advisory_unlock(142857); }
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step s1_advunlock2 { SELECT pg_advisory_unlock(285714); }
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step s1_advunlock3 { SELECT pg_advisory_unlock(571428); }
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step s1_commit { COMMIT; }
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session s2
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step s2_update { UPDATE pktab SET data = DEFAULT WHERE pg_advisory_lock_shared(142857) IS NOT NULL; }
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session s3
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step s3_update { UPDATE pktab SET data = DEFAULT WHERE pg_advisory_lock_shared(285714) IS NOT NULL; }
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session s4
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step s4_update { UPDATE pktab SET data = DEFAULT WHERE pg_advisory_lock_shared(571428) IS NOT NULL; }
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# We use blocker annotations on the s1_advunlockN steps so that we will not
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# move on to the next step until the other session's released step finishes.
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# This ensures stable ordering of the test output.
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permutation s1_advlock s2_update s3_update s4_update s1_chain s1_begin s1_grablock s1_advunlock1(s2_update) s1_advunlock2(s3_update) s1_advunlock3(s4_update) s1_commit
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