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Implement PEP 788#133110

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ZeroIntensity wants to merge 18 commits intopython:mainpython/cpython:mainfrom

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Commits on Apr 24, 2025

• Implement interpreter state reference counting.

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• Add a test for interpreter reference counts.

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Commits on Apr 25, 2025

• Add thread state daemon-ness that doesn't work yet.

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• Add untested implementation of non-daemon native threads.

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• Add a test for PyThreadState_SetDaemon().

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• Add untested implementation of Ensure()/Release() that probably doesn't work and isn't thread-safe.

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• Change some comments.

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• Add a test that I'm sure doesn't work.

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• Use the interpreter's reference count and native thread countdown as one.

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Commits on Apr 26, 2025

• Fix the countdown decrement.

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• Remove unused variable.

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• Test for PyGILState_Ensure()

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• Fix the test for the new reference counting.

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  82b5b9f

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• Add PyInterpreterState_Lookup()

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  fda9886

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• Fix a few bugs and add a test.

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Commits on Apr 27, 2025

• Add a test for PyThreadState_Ensure() across interpreters.

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Commits on Apr 28, 2025

• Remove an artifact from old approach.

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  bc60630

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• Fix test from earlier semantics.

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