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# If we already hold a lock of a given strength, do not deadlock when
# some other transaction is waiting for a conflicting lock and we try
# to acquire the same lock we already held.
setup
{
CREATE TABLE justthis (
value int
);
INSERT INTO justthis VALUES (1);
}
teardown
{
DROP TABLE justthis;
}
session "s1"
setup { BEGIN; }
step "s1lock" { SELECT * FROM justthis FOR SHARE; }
step "s1svpt" { SAVEPOINT foo; }
step "s1lock2" { SELECT * FROM justthis FOR SHARE; }
step "s1c" { COMMIT; }
session "s2"
setup { BEGIN; }
step "s2lock" { SELECT * FROM justthis FOR SHARE; } # ensure it's a multi
step "s2c" { COMMIT; }
session "s3"
setup { BEGIN; }
step "s3lock" { SELECT * FROM justthis FOR UPDATE; }
step "s3c" { COMMIT; }
permutation "s1lock" "s2lock" "s1svpt" "s3lock" "s1lock2" "s2c" "s1c" "s3c"
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