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Title: gh-123471: Make concurrent iteration over itertools.islice thread-safe by eendebakpt · Pull Request #144528 · python/cpython · GitHub

Open Graph Title: gh-123471: Make concurrent iteration over itertools.islice thread-safe by eendebakpt · Pull Request #144528 · python/cpython

X Title: gh-123471: Make concurrent iteration over itertools.islice thread-safe by eendebakpt · Pull Request #144528 · python/cpython

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Open Graph Description: We make itertools.islice safe under free-threading (e.g. guard against crashes) by: Atomically getting and setting the mutable fields cnt and next Using the step field as a sentinel for iterator e...

X Description: We make itertools.islice safe under free-threading (e.g. guard against crashes) by: Atomically getting and setting the mutable fields cnt and next Using the step field as a sentinel for iterator e...

Opengraph URL: https://github.com/python/cpython/pull/144528

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gh-123471: Make concurrent iteration over itertools.islice thread-safehttps://github.com/python/cpython/pull/144528#top
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#144402https://github.com/python/cpython/pull/144402
Make concurrent iteration over pairwise, combinations, permutations, cwr, product, etc. from itertools safe under free-threading #123471https://github.com/python/cpython/issues/123471
Please reload this pagehttps://github.com/python/cpython/pull/144528
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February 5, 2026 21:15https://github.com/python/cpython/pull/144528#commits-pushed-e5fb151
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Make itertools.islice safe in the FT buildhttps://github.com/python/cpython/pull/144528/commits/e5fb1519fc4414f748823006c37e7882a814fdca
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atomic store of lz->nexthttps://github.com/python/cpython/pull/144528/commits/443404e052f60afca6c244fb0d9f03eb227a0804
443404ehttps://github.com/python/cpython/pull/144528/commits/443404e052f60afca6c244fb0d9f03eb227a0804
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use step as sentinelhttps://github.com/python/cpython/pull/144528/commits/e1e61dff6b1ce2406e8e5b16eba9ad48d2dec18a
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Make concurrent iteration over pairwise, combinations, permutations, cwr, product, etc. from itertools safe under free-threading #123471 https://github.com/python/cpython/issues/123471
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Merge branch 'main' into islice_fthttps://github.com/python/cpython/pull/144528/commits/572c0711ed9ec6ab07f6d879987209f0a92acc5a
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Merge branch 'main' into islice_fthttps://github.com/python/cpython/pull/144528/commits/b406b7f6bd0cc085e9c4fb8df675d1c668d65c1f
b406b7fhttps://github.com/python/cpython/pull/144528/commits/b406b7f6bd0cc085e9c4fb8df675d1c668d65c1f
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Merge branch 'main' into islice_fthttps://github.com/python/cpython/pull/144528/commits/e71b7b81a4fc9cfd70879a9997a0bae3336af024
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