=== modified file 'Lib/_dummy_thread.py'
--- Lib/_dummy_thread.py	2008-05-25 13:05:15 +0000
+++ Lib/_dummy_thread.py	2008-07-11 08:01:48 +0000
@@ -106,7 +106,7 @@
         """
         if waitflag is None:
             self.locked_status = True
-            return None
+            return True
         elif not waitflag:
             if not self.locked_status:
                 self.locked_status = True