[issue38076] Make struct module PEP-384 compatible

[Dino Viehland]

Dino Viehland <dinoviehland at gmail.com> added the comment:

One more data point: Backporting this change to Python 3.6 (I just happened to have it applied there already, so I haven't tried it on 3.7 or 3.8) has no crash and no hangs in multiprocessing on Linux.  So something definitely changed in multiproessing which is causing the hang on shutdown, and forces us into this code path where we crash as well.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38076>
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