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

[Andreas van Cranenburgh]

Andreas van Cranenburgh added the comment:

Here's a patch. I have added initializer and initargs keywords to both ThreadPoolExecutor and ProcessPoolExecutor, with the same semantics as multiprocessing.Pool.

I couldn't figure out what to do if the initializer fails with a ProcessPoolExecutor: how to properly send the traceback back? I also haven't gotten around to figure out how to write tests.
I haven't added unitializers, don't know if they would be useful.

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keywords: +patch
Added file: http://bugs.python.org/file35179/pool_initializer.patch

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