[issue1021318] PyThreadState_Next not thread safe

[Julien Danjou]

Julien Danjou <julien at danjou.info> added the comment:

Victor, do you have an idea of how you would like this mutex to be exposed?

I see it only recently changed in Python 3.7 to be part of a structure, though this structure is not public AFAIU.

Is adding 2 new lock/unlock C functions good enough?

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