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
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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.