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Title: gh-151409: add critical section for `islice_next` by KowalskiThomas · Pull Request #151410 · python/cpython · GitHub

Open Graph Title: gh-151409: add critical section for `islice_next` by KowalskiThomas · Pull Request #151410 · python/cpython

X Title: gh-151409: add critical section for `islice_next` by KowalskiThomas · Pull Request #151410 · python/cpython

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Open Graph Description: Fixes #151409. Issue: Race condition in itertools.islice under free-threading #151409

X Description: Fixes #151409. Issue: Race condition in itertools.islice under free-threading #151409

Opengraph URL: https://github.com/python/cpython/pull/151410

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fix: critical section for islice_nexthttps://github.com/python/cpython/pull/151410/commits/c82bf62723065fade1e93a4c0b8d00c81154b863
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June 12, 2026 17:44https://github.com/python/cpython/pull/151410#commits-pushed-1b65c9c
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