> I would certainly be willing to look into it.

As an update to this thread for anyone interested in this feature, it's been implemented in Python 3.9 for both ProcessPoolExecutor and ThreadPoolExecutor as a new parameter to Executor.shutdown(), *cancel_futures*.

For a description of the feature, see the updated documentation: https://docs.python.org/3.9/library/concurrent.futures.html#concurrent.futures.Executor.shutdown

For implementation details, see the PR: https://github.com/python/cpython/pull/18057

Also, thank you Guido for bringing attention to the issue. The implementation was a bit more involved than I initially anticipated (particularly for ProcessPoolExecutor), but I found it to be well worth the effort! Both for the benefit of the new feature, and for the opportunity to work with a part of the internals of the executors.

On Wed, Jan 15, 2020 at 5:59 PM Kyle Stanley <aeros167@gmail.com> wrote:
> Is anyone else interested in implementing this small feature for concurrent.futures?

I would certainly be willing to look into it. We've been discussing the possibility of a native threadpool for asyncio in the future (https://bugs.python.org/issue32309), so it would certainly be beneficial for me to build some experience in working with the internals of the executors. I think implementing this small feature would be a good introduction.

On Wed, Jan 15, 2020 at 5:37 PM Guido van Rossum <guido@python.org> wrote:
(Belatedly)

Is anyone else interested in implementing this small feature for concurrent.futures?

On Fri, Jan 3, 2020 at 18:28 Miguel Ángel Prosper <miguelangel.prosper@gmail.com> wrote:
> It looks like you have a good handle on the code -- do you want to submit a PR to GitHub to add such a parameter?

Thanks, but I'm not really sure how to implement it in the ProcessPoolExecutor, I just think the solution is probably related to the code responsible of handling a failed initializer (since they do very similar things). On the ThreadPoolExecutor maybe I could, but I haven't really checked for side effects or weird things.
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