[issue15751] Add PyGILState_SwitchInterpreter

[Graham Dumpleton]

Graham Dumpleton 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.

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

https://issues.apache.org/jira/browse/MODPYTHON-217

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