[issue15751] Add PyGILState_SwitchInterpreter

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Those macros only work for general GIL releasing and pop straight
> away, not for the case where released, calls into some non Python C
> library, which then calls back into Python.

I see, so you are right that this new API could be useful. However, we
should also add a new GIL state API that fixes the issue for good (by
passing an interpreter), otherwise we will still have such discussions
in five years and it will be very silly.

> My recollection is, and so unless they have changed it, SWIG generated
> calls use the GILState calls. See:

Well, if SWIG isn't fixed, people should stop using an unmaintained and
buggy tool.

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