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# The deadlock detector has a special case for "simple" deadlocks. A simple
# deadlock occurs when we attempt a lock upgrade while another process waits
# for a lock upgrade on the same object; and the sought locks conflict with
# those already held, so that neither process can complete its upgrade until
# the other releases locks. Test this scenario.
setup
{
CREATE TABLE a1 ();
}
teardown
{
DROP TABLE a1;
}
session s1
setup { BEGIN; }
step s1as { LOCK TABLE a1 IN ACCESS SHARE MODE; }
step s1ae { LOCK TABLE a1 IN ACCESS EXCLUSIVE MODE; }
step s1c { COMMIT; }
session s2
setup { BEGIN; }
step s2as { LOCK TABLE a1 IN ACCESS SHARE MODE; }
step s2ae { LOCK TABLE a1 IN ACCESS EXCLUSIVE MODE; }
step s2c { COMMIT; }
permutation s1as s2as s1ae s2ae s1c s2c
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