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BUG: fix race initializing legacy dtype casts#28321
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- Checkout numpy/testing/_private/utils.py- Checkout numpy/_core/tests/test_multithreading.py- Checkout conftest.py- Update test_requirements.txt
56f8d5b intonumpy:maintenance/2.2.x 65 of 69 checks passed
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Labels
00 - Bug08 - BackportUsed to tag backport PRs 39 - free-threadingPRs and issues related to support for free-threading CPython (a.k.a. no-GIL, PEP 703)
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Backport of#28290.
Fixes#28048
Locks
castingimplswith a critical section when thecastingimplscache is empty before writing to the dict.Because the critical section macros have braces, I refactored
PyArray_GetCastingImplinto three functions that call each other. Only the "middle" function needs the critical section, so that reduces the pain of not being able to early return in a critical section a little bit.I also added some comments because this took me quite a while to fully understand so future readers will hopefully be less confused.
Edit: there are also some unrelated fixes for the test infrastructure to avoid CI crashes and generate better debug output from CI jobs. Happy to do those separately if anyone requests.