Deprecate and Then Remove PyGILState_GetThisThreadState()

Feature or enhancement

Proposal:

(See https://docs.python.org/3/c-api/init.html#c.PyGILState_GetThisThreadState.)

PyGILState_GetThisThreadState() was added as part of the PEP 311 implementation. However, it wasn't part of that proposal. It isn't clear that it was even meant to be public API.

If a user wants to know what the current thread state is then they should use PyThreadState_Get(). PyGILState_GetThisThreadState() is subtly different and surfaces some of the tricky PyGILState corner cases that PyThreadState_Get() blissfully ignores. A real issue here is that users are reasonably likely to stumble across PyGILState_GetThisThreadState() and, due to the name, use it instead of the proper API.

I can think of one thing that PyGILState_GetThisThreadState() does exclusively: it will tell you what existing thread state PyGILState_Ensure() will use, if any. It isn't clear to me if that's a meaningful use case.

Ultimately, I expect we would be fine to get rid of PyGILState_GetThisThreadState(). If still useful for core development, it could be moved to the internal C-API.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

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Beginne mit dem C-API-Dokumentationseintrag für PyGILState_GetThisThreadState() und vergleiche dessen beschriebenes Verhalten mit PyThreadState_Get(). Bestimme den vereinbarten Umfang der Abkündigung und Entfernung, einschließlich der Frage, ob eine interne C-API-Nutzung bestehen bleiben muss; als erledigt gilt die Aufgabe, wenn ein von einem Maintainer genehmigter Plan sowie die entsprechenden Dokumentations- und Implementierungsänderungen vorliegen.