MAINT: avoid possible race condition by not touching os.environ on import.#30657
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charris merged 1 commit intonumpy:maintenance/2.4.xfrom Jan 15, 2026
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MAINT: avoid possible race condition by not touching os.environ on import.#30657charris merged 1 commit intonumpy:maintenance/2.4.xfrom
os.environ on import.#30657charris merged 1 commit intonumpy:maintenance/2.4.xfrom
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…import We need to set the `OPENBLAS_MAIN_FREE` environment variable before the OpenBLAS initialization runs, however we don't need to touch `os.environ` for that. Deleting a key from `os.environ` can lead to a race condition when numpy is imported in parallel in multiple threads, while `os.unsetenv` always succeeds. See numpygh-30627 for context. Also clean up `GOTOBLAS_MAIN_FREE`, that's a deprecated env var that has the same function as `OPENBLAS_MAIN_FREE`. There won't be any GotoBLAS or early OpenBLAS versions in use anymore that only have the GOTOBLAS flavor. Closes numpygh-30627 Closes numpygh-21223
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Backport of #30637.
We need to set the
OPENBLAS_MAIN_FREEenvironment variable before the OpenBLAS initialization runs, however we don't need to touchos.environfor that. Deleting a key fromos.environcan lead to a race condition when numpy is imported in parallel in multiple threads, whileos.unsetenvalways succeeds. See gh-30627 for context.Also clean up
GOTOBLAS_MAIN_FREE, that's a deprecated env var that has the same function asOPENBLAS_MAIN_FREE. There won't be any GotoBLAS or early OpenBLAS versions in use anymore that only have the GOTOBLAS flavor.Closes gh-30627
Closes gh-21223