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gh-123471: Make concurrent iteration over itertools.pairwise thread-safe #144489

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gh-123471: Make concurrent iteration over itertools.pairwise thread-safe #144489

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8810175
add test for pairwise
eendebakpt Feb 4, 2026
11e727d
Make itertools.pairwise safe in the FT build
eendebakpt Feb 4, 2026
a91f13c
add comment for incref rationale
eendebakpt Feb 4, 2026
931b2f9
add comment for incref rationale
eendebakpt Feb 4, 2026
a030f5a
📜🤖 Added by blurb_it.
blurb-it[bot] Feb 4, 2026
9c87957
Merge branch 'pairwise_ft_v3' of github.com:eendebakpt/cpython into p…
eendebakpt Feb 4, 2026
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add comment for incref rationale
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@eendebakpt
eendebakpt committed Feb 4, 2026
commit a91f13ceab22568bdead16c9f4188e6e4302d4cc
2 changes: 1 addition & 1 deletion Modules/itertoolsmodule.c
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Expand Up @@ -366,7 +366,7 @@ pairwise_next_lock_held(PyObject *op)
return NULL;
}
}
Py_INCREF(old);
Py_INCREF(old); // needed because of reentant calls via call to the iterator
new = (*Py_TYPE(it)->tp_iternext)(it);
if (new == NULL) {
Py_CLEAR(po->it);
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