[issue38141] Use fewer statics in Argument Clinic.

[Eric Snow]

Eric Snow <ericsnowcurrently at gmail.com> added the comment:

That might work. :)

There are two key problems under subinterpreters that do not share the GIL:

* races on refcount operations
* cache thrashing due to refcount operations (under multi-core threads)

A lock would certainly mitigate the first problem.  I'm not sure how much the second would actually be a problem.

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