[2856] With no readers, make complete_update() from UPDATING go directly to READY

src/lib/python/isc/memmgr/datasrc_info.py

@@ -169,7 +169,7 @@ class SegmentInfo:
             self.__state = self.SYNCHRONIZING
             self.__old_readers = self.__readers
             self.__readers = set()
-            return self.__sync_reader_helper(self.SYNCHRONIZING)
+            return self.__sync_reader_helper(self.READY)
         elif self.__state == self.COPYING:
             self.__state = self.READY
             return None

src/lib/python/isc/memmgr/tests/datasrc_info_tests.py

@@ -175,6 +175,18 @@ class TestSegmentInfo(unittest.TestCase):
         self.assertIsNone(e) # old_readers is not empty
         self.assertEqual(self.__sgmt_info.get_state(), SegmentInfo.SYNCHRONIZING)
 
+        # c) with no readers, complete_update() from UPDATING must go
+        # directly to READY state
+        self.__si_to_ready_state()
+        self.__sgmt_info.add_event((42,))
+        e = self.__sgmt_info.start_update()
+        self.assertTupleEqual(e, (42,))
+        self.assertSetEqual(self.__sgmt_info.get_readers(), set())
+        self.assertEqual(self.__sgmt_info.get_state(), SegmentInfo.UPDATING)
+        e = self.__sgmt_info.complete_update()
+        self.assertTupleEqual(e, (42,))
+        self.assertEqual(self.__sgmt_info.get_state(), SegmentInfo.READY)
+
         # in SYNCHRONIZING state
         self.__si_to_synchronizing_state()
         self.assertRaises(SegmentInfoError, self.__sgmt_info.complete_update)