# Test SKIP LOCKED with tuple locks.

setup
{
  CREATE TABLE queue (
	id	int		PRIMARY KEY,
	data			text	NOT NULL,
	status			text	NOT NULL
  );
  INSERT INTO queue VALUES (1, 'foo', 'NEW'), (2, 'bar', 'NEW');
}

teardown
{
  DROP TABLE queue;
}

session "s1"
setup		{ BEGIN; }
step "s1a"	{ SELECT * FROM queue ORDER BY id FOR UPDATE LIMIT 1; }
step "s1b"	{ COMMIT; }

session "s2"
setup		{ BEGIN; }
step "s2a"	{ SELECT * FROM queue ORDER BY id FOR UPDATE LIMIT 1; }
step "s2b"	{ COMMIT; }

session "s3"
setup		{ BEGIN; }
step "s3a"	{ SELECT * FROM queue ORDER BY id FOR UPDATE SKIP LOCKED LIMIT 1; }
step "s3b"	{ COMMIT; }

# s3 skips to the second record because it can't obtain the tuple lock
# (s2 holds the tuple lock because it is next in line to obtain the
# row lock, and s1 holds the row lock)
permutation "s1a" "s2a" "s3a" "s1b" "s2b" "s3b"
