[3.9] [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 ebb37fc)
Co-authored-by: Gregory P. Smith greg@krypto.org
(cherry picked from commit b795376)
Co-authored-by: Gregory P. Smith greg@krypto.org
Automerge-Triggered-By: GH:gpshead