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# Test NOWAIT with an updated tuple chain.
setup
{
CREATE TABLE foo (
id int PRIMARY KEY,
data text NOT NULL
);
INSERT INTO foo VALUES (1, 'x');
}
teardown
{
DROP TABLE foo;
}
session "s1"
setup { BEGIN; }
step "s1a" { SELECT * FROM foo WHERE pg_advisory_lock(0) IS NOT NULL FOR UPDATE NOWAIT; }
step "s1b" { COMMIT; }
session "s2"
step "s2a" { SELECT pg_advisory_lock(0); }
step "s2b" { UPDATE foo SET data = data; }
step "s2c" { BEGIN; }
step "s2d" { UPDATE foo SET data = data; }
step "s2e" { SELECT pg_advisory_unlock(0); }
step "s2f" { COMMIT; }
# s1 takes a snapshot but then waits on an advisory lock, then s2
# updates the row in one transaction, then again in another without
# committing, before allowing s1 to proceed to try to lock a row;
# because it has a snapshot that sees the older version, we reach the
# waiting code in EvalPlanQualFetch which ereports when in NOWAIT mode.
permutation "s2a" "s1a" "s2b" "s2c" "s2d" "s2e" "s1b" "s2f"
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