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# Test NOWAIT with multixact locks.
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 FOR SHARE NOWAIT; }
step s1b { COMMIT; }
session s2
setup { BEGIN; }
step s2a { SELECT * FROM foo FOR SHARE NOWAIT; }
step s2b { SELECT * FROM foo FOR UPDATE NOWAIT; }
step s2c { COMMIT; }
# s1 and s2 both get SHARE lock, creating a multixact lock, then s2
# tries to upgrade to UPDATE but aborts because it cannot acquire a
# multi-xact lock
permutation s1a s2a s2b s1b s2c
# the same but with the SHARE locks acquired in a different order, so
# s2 again aborts because it can't acquired a multi-xact lock
permutation s2a s1a s2b s1b s2c
# s2 acquires SHARE then UPDATE, then s1 tries to acquire SHARE but
# can't so aborts because it can't acquire a regular lock
permutation s2a s2b s1a s1b s2c
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