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ENH: use raw memory allocation APIs under free-threading - #30846
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LGTM, since I think Nathan also doesn't think this affects things default Python builds and it is unlikely to affect more than a hand-few of projects, let's get it in.
(I'll apply a tiny change, since I think the release notes section will get mangled up otherwise.)
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Co-authored-by: Sebastian Berg <sebastian@sipsolutions.net>
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Fixes #30494
This PR changes
alloc.cppto use raw memory allocation APIs from CPython so that it can usemimallocunder 3.15 free-threaded builds. I have also removed the unnecessaryNPY_BEGIN_THREADS_DEFcalls to release the thread state which just adds overhead. For reference CPython also does not releases the thread state when allocating memory so this aligns numpy with CPython.