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What does Semaphore have to do with _DummyThread and 
currentThread?

And as for win32api, that is not part of the Python stdlib and thus I have 
no way of commenting on that.

For C++ threads to call into Python code, I would not say that is bad 
specifically.  You were just trying to get thread info for non-Python 
threads and that was leading to _DummyThread instances to be created 
as designed and you just didn't want that.  Calling Python code is fine, 
just don't expect it to know about your C++ threads as much as you 
seem to want it to.

And please leave this bug closed.  If free to submit a patch to change 
semantics, but that does not affect this bug report.