[issue21332] subprocess bufsize=1 docs are misleading

[akira]

akira added the comment:

> The short answer is: no, you don't have to make you thread thread
> safe, as long as it can reliably run even in the presence of
> background threads (like the tkinter threads Victor mentions).

https://mail.python.org/pipermail/python-dev/2014-May/134541.html

It seems the test may be left as is.

Please, review the patch.

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