[issue33632] undefined behaviour: signed integer overflow in threadmodule.c

[Zackery Spytz]

Zackery Spytz <zspytz at gmail.com> added the comment:

I've created a PR based on Martin Panter's patch.

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components: +Extension Modules -Library (Lib)
nosy: +ZackerySpytz
versions:  -Python 3.6

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<https://bugs.python.org/issue33632>
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