> Hum, I get a strange skip on a XP buildbot:
> 
> [224/354] test_multiprocessing
> test_multiprocessing skipped -- DLL load failed: The specified
> procedure could not be found.
> 
> Yet _multiprocessing was compiled fine... Does anyone know what it
> means?

Ok, the culprit is CancelIoEx(), which is only supported under Vista and
later (but, strangely enough, compiles fine under XP).
I need to use CancelIo() instead, which will lead me to change the
implementation strategy slightly (the fact that CancelIo() is
thread-specific makes it unsuitable for a tp_dealloc).