1 files changed, 41 insertions, 0 deletions
diff --git a/src/test/isolation/specs/skip-locked-2.spec b/src/test/isolation/specs/skip-locked-2.spec
new file mode 100644
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--- /dev/null
+++ b/src/test/isolation/specs/skip-locked-2.spec
@@ -0,0 +1,41 @@
+# Test SKIP LOCKED with multixact 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 SHARE SKIP LOCKED LIMIT 1; }
+step s1b	{ COMMIT; }
+
+session s2
+setup		{ BEGIN; }
+step s2a	{ SELECT * FROM queue ORDER BY id FOR SHARE SKIP LOCKED LIMIT 1; }
+step s2b	{ SELECT * FROM queue ORDER BY id FOR UPDATE SKIP LOCKED LIMIT 1; }
+step s2c	{ COMMIT; }
+
+# s1 and s2 both get SHARE lock, creating a multixact lock, then s2
+# tries to update to UPDATE but skips the record because it can't
+# acquire a multixact lock
+permutation s1a s2a s2b s1b s2c
+
+# the same but with the SHARE locks acquired in a different order, so
+# s2 again skips because it can't acquired a multixact lock
+permutation s2a s1a s2b s1b s2c
+
+# s2 acquires SHARE then UPDATE, then s1 tries to acquire SHARE but
+# can't so skips the first record because it can't acquire a regular
+# lock
+permutation s2a s2b s1a s1b s2c