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[3.10] gh-90622: Do not spawn ProcessPool workers on demand via fork method. (GH-91598) (GH-92497) (#92499)

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Do not spawn ProcessPool workers on demand when they spawn via fork.

This avoids potential deadlocks in the child processes due to forking from
a multithreaded process..
(cherry picked from commit ebb37fc3fd)

Co-authored-by: Gregory P. Smith <greg@krypto.org>
(cherry picked from commit b795376a62)

Co-authored-by: Gregory P. Smith <greg@krypto.org>

Co-authored-by: Gregory P. Smith <greg@krypto.org>
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Miss Islington (bot) 2022-05-08 11:22:36 -07:00 • committed by GitHub
parent 08907ad687
commit 8e523c1151
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Misc/NEWS.d/next/Library/2022-04-15-22-07-36.gh-issue-90622.0C6l8h.rst Normal file
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Worker processes for :class:`concurrent.futures.ProcessPoolExecutor` are no
longer spawned on demand (a feature added in 3.9) when the multiprocessing
context start method is ``"fork"`` as that can lead to deadlocks in the
child processes due to a fork happening while threads are running.