[3.12] gh-105716: Support Background Threads in Subinterpreters Consistently (gh-109921) #110707
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The existence of background threads running on a subinterpreter was preventing interpreters from getting properly destroyed, as well as impacting the ability to run the interpreter again. It also affected how we wait for non-daemon threads to finish.
We add PyInterpreterState.threads.main, with some internal C-API functions.
(cherry-picked from commit 1dd9dee)