Adding upstream version 15.5.upstream/15.5

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 39 insertions, 0 deletions

diff --git a/src/test/isolation/specs/read-write-unique.spec b/src/test/isolation/specs/read-write-unique.spec
new file mode 100644
index 0000000..3ce059f
--- /dev/null
+++ b/src/test/isolation/specs/read-write-unique.spec
@@ -0,0 +1,39 @@
+# Read-write-unique test.
+
+setup
+{
+  CREATE TABLE test (i integer PRIMARY KEY);
+}
+
+teardown
+{
+  DROP TABLE test;
+}
+
+session s1
+setup { BEGIN ISOLATION LEVEL SERIALIZABLE; }
+step r1 { SELECT * FROM test; }
+step w1 { INSERT INTO test VALUES (42); }
+step c1 { COMMIT; }
+
+session s2
+setup { BEGIN ISOLATION LEVEL SERIALIZABLE; }
+step r2 { SELECT * FROM test; }
+step w2 { INSERT INTO test VALUES (42); }
+step c2 { COMMIT; }
+
+# Two SSI transactions see that there is no row with value 42
+# in the table, then try to insert that value; T1 inserts,
+# and then T2 blocks waiting for T1 to commit.  Finally,
+# T2 reports a serialization failure.
+#
+# (In an earlier version of Postgres, T2 would report a unique
+# constraint violation).
+
+permutation r1 r2 w1 w2 c1 c2
+
+# If the value is already visible before T2 begins, then a
+# regular unique constraint violation should still be raised
+# by T2.
+
+permutation r1 w1 c1 r2 w2 c2