If you apply the following patch to the py3k branch, you can watch
test_threading fail in test_no_refcycle_through_target:
Index: Lib/threading.py
===================================================================
--- Lib/threading.py (revision 62033)
+++ Lib/threading.py (working copy)
@@ -540,6 +540,7 @@
finally:
with _active_limbo_lock:
self._stop()
+ _sleep(0.01)
try:
# We don't call self.__delete() because it also
# grabs _active_limbo_lock.
This apparently happens because the traceback in sys.exc_info keeps
the frame for the call to RunSelfFunction._run alive even though there
are otherwise no references to the object. In 2.6, this is fixed by
calling sys.exc_clear() before allowing the thread to be joined, but
that function has gone away in 3.0. I had thought that exc_info was
automatically cleared at the end of any except block that caught an
exception, but apparently that isn't the case. Is this a bug in 3.0,
or do we need to keep sys.exc_clear() around?
--
Namasté,
Jeffrey Yasskin
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