[issue10330] trace module doesn't work without threads

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> dummy_threading feels a bit like black magic to me.  What do you think
> about something like issue10330.diff attached.

It's fine for me.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10330>
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