[issue30747] _Py_atomic_* not actually atomic on Windows with MSVC

[Pär Björklund]

Pär Björklund added the comment:

My guess would be the cast from uintptr_t to intptr_t in the return type.

I'll look into this, when possible, should have some time later this week or over the weekend.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30747>
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