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:

No response

从 PyGILState_GetThisThreadState() 的 C-API 文档条目开始，并将其中所述的行为与 PyThreadState_Get() 进行比较。确定已达成共识的弃用和移除范围，包括是否必须保留任何内部 C-API 使用；完成的要求是制定出经 maintainer 批准的计划，并完成相应的文档和实现更改。