# CREATE TRIGGER - Add trigger with concurrent reads
#
# CREATE TRIGGER uses ShareRowExclusiveLock so we mix writes with it
# to see what works or waits.

setup
{
 CREATE TABLE a (i int);
 CREATE FUNCTION f() RETURNS TRIGGER LANGUAGE plpgsql AS 'BEGIN RETURN NULL; END;';
 INSERT INTO a VALUES (0), (1), (2), (3);
}

teardown
{
 DROP TABLE a;
 DROP FUNCTION f();
}

session s1
step s1a { BEGIN; }
step s1b { CREATE TRIGGER t AFTER UPDATE ON a EXECUTE PROCEDURE f(); }
step s1c { COMMIT; }

session s2
step s2a { BEGIN; }
step s2b { SELECT * FROM a WHERE i = 1 FOR UPDATE; }
step s2c { UPDATE a SET i = 4 WHERE i = 3; }
step s2d { COMMIT; }

permutation s1a s1b s1c s2a s2b s2c s2d
permutation s1a s1b s2a s1c s2b s2c s2d
permutation s1a s1b s2a s2b s1c s2c s2d
permutation s1a s1b s2a s2b s2c s1c s2d
permutation s1a s2a s1b s1c s2b s2c s2d
permutation s1a s2a s1b s2b s1c s2c s2d
permutation s1a s2a s1b s2b s2c s1c s2d
permutation s1a s2a s2b s1b s1c s2c s2d
permutation s1a s2a s2b s1b s2c s1c s2d
permutation s1a s2a s2b s2c s1b s2d s1c
permutation s1a s2a s2b s2c s2d s1b s1c
permutation s2a s1a s1b s1c s2b s2c s2d
permutation s2a s1a s1b s2b s1c s2c s2d
permutation s2a s1a s1b s2b s2c s1c s2d
permutation s2a s1a s2b s1b s1c s2c s2d
permutation s2a s1a s2b s1b s2c s1c s2d
permutation s2a s1a s2b s2c s1b s2d s1c
permutation s2a s1a s2b s2c s2d s1b s1c
permutation s2a s2b s1a s1b s1c s2c s2d
permutation s2a s2b s1a s1b s2c s1c s2d
permutation s2a s2b s1a s2c s1b s2d s1c
permutation s2a s2b s1a s2c s2d s1b s1c
permutation s2a s2b s2c s1a s1b s2d s1c
permutation s2a s2b s2c s1a s2d s1b s1c
permutation s2a s2b s2c s2d s1a s1b s1c