Merge p3yk branch with the trunk up to revision 45595. This breaks a fair
number of tests, all because of the codecs/_multibytecodecs issue described
here (it's not a Py3K issue, just something Py3K discovers):
http://mail.python.org/pipermail/python-dev/2006-April/064051.html

Hye-Shik Chang promised to look for a fix, so no need to fix it here. The
tests that are expected to break are:

test_codecencodings_cn
test_codecencodings_hk
test_codecencodings_jp
test_codecencodings_kr
test_codecencodings_tw
test_codecs
test_multibytecodec

This merge fixes an actual test failure (test_weakref) in this branch,
though, so I believe merging is the right thing to do anyway.
diff --git a/Lib/dummy_thread.py b/Lib/dummy_thread.py
index fb3abbf..d69d840 100644
--- a/Lib/dummy_thread.py
+++ b/Lib/dummy_thread.py
@@ -113,6 +113,14 @@
             self.locked_status = True
             return True
 
+    __enter__ = acquire
+
+    def __exit__(self, typ, val, tb):
+        self.release()
+
+    def __context__(self):
+        return self
+
     def release(self):
         """Release the dummy lock."""
         # XXX Perhaps shouldn't actually bother to test?  Could lead