BUG: fix free-threaded races in RandomState - #30400
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charris
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00 - Bug
08 - Backport
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Backport of #30360.
Fixes one of the races in #30085.
I'd appreciate it if one of @lysnikolaou, @kumaraditya303, or @crusaderky could look this over, since you're all doing work related to this change.
I verified that the test I added generates TSan races without the cython change to add critical sections.
As far as I can tell, all other reads and writes to internal state are either atomic (e.g. in
get_state) or are done with athreading.lockheld and don't need any additional synchronization.