[issue21423] concurrent.futures.ThreadPoolExecutor should accept an initializer argument

[Andreas van Cranenburgh]

Andreas van Cranenburgh added the comment:

Giampaolo, this patch is for ProcessPoolExecutor as well.

About keyboard interrupts, if my tests are correct, they work
in Python 3.3+ with both multiprocessing and concurrent.futures.
(Although for the latter I have to hit ctrl-c twice).

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<http://bugs.python.org/issue21423>
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