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Title: gh-123471: Make itertools.zip_longest safe in the FT build by eendebakpt · Pull Request #146033 · python/cpython · GitHub

Open Graph Title: gh-123471: Make itertools.zip_longest safe in the FT build by eendebakpt · Pull Request #146033 · python/cpython

X Title: gh-123471: Make itertools.zip_longest safe in the FT build by eendebakpt · Pull Request #146033 · python/cpython

Description: ziplongest_next is not thread safe due to setting the iterators in lz->ittuple to NULL on exhaustion. In addition, the lz->numactive is mutable state. The usual approach to making the iterators in this module thread-safe by not setting the underlying iterator to NULL is not working here, since the NULL value is used as a signal (e.g. the check it == NULL). We therefore make the iterator safe using a critical section. Issue: gh-123471

Open Graph Description: ziplongest_next is not thread safe due to setting the iterators in lz->ittuple to NULL on exhaustion. In addition, the lz->numactive is mutable state. The usual approach to making the iterato...

X Description: ziplongest_next is not thread safe due to setting the iterators in lz->ittuple to NULL on exhaustion. In addition, the lz->numactive is mutable state. The usual approach to making the...

Opengraph URL: https://github.com/python/cpython/pull/146033

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ac98683 Make itertools.zip_longest safe in the FT build eendebakpt Mar 16, 2026 https://github.com/python/cpython/pull/146033/commits/ac986834c6561539b341105fae8f8770c5333bcf
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94fd7d7 📜🤖 Added by blurb_it. blurb-it[bot] Mar 17, 2026 https://github.com/python/cpython/pull/146033/commits/94fd7d70ef06a00426a48102cb11dbd363bb137f
d70e699 Merge branch 'main' into ziplongest_ft eendebakpt Mar 18, 2026 https://github.com/python/cpython/pull/146033/commits/d70e699a25b37ac0f1734adc3919d52e49a01ccf
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