gh-126644: Fix various thread safety issues in `_interpreters` - #126696

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ZeroIntensity wants to merge 24 commits into

python:mainfrom

ZeroIntensity:interp-running-thread-safety

Commits on Nov 10, 2024

Initial fix.
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f18939a
Remove junk file.
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756bf41
Merge branch 'main' of https://github.com/python/cpython into interp-running-thread-safety
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45c4561
Don't overwrite the main thread.
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a94eaef
Small changes.
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206b581
Put lock around exception capturing.
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286e536
Add a comment.
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2fab7af
Add blurb.
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446abc1
Add a test.
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cc36e8d
Skip test on the default build.
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e25587e
Fix and move tests.
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e4b2c79
Somehow, the locks are re-entrant.
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aeb483e

Commits on Nov 11, 2024

Don't rely on the interpreter state for _PyXI_ERR_ALREADY_RUNNING
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92b3ea7
Throw an exception if there's a remaining thread state.
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804c41e
Remove newline.
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2edfda3
Remove another newline.
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bb8feee
Add docstrings.
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5968448
Protect _PyIndexPool_AllocIndex with the runtime lock.
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9ab979d
Bump the thread count.
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b478375
Add comments to the test.
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f393ab6
Re-enable subinterpreter tests for the free-threaded build.
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35323f8
Fix tests.
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67df772
Lock runtime instead of using pyatomic
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13e96de
Fix failing builds.
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c9e7b08