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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
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Merge branch 'pairwise_ft_v3' of github.com:eendebakpt/cpython into p…
eendebakpt Feb 4, 2026
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add test for pairwise
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@eendebakpt
eendebakpt committed Feb 4, 2026
commit 88101755c042ca323177f4d91130e7fb02bc9218
9 changes: 8 additions & 1 deletion Lib/test/test_free_threading/test_itertools.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
import unittest
from itertools import batched, chain, combinations_with_replacement, cycle, permutations
from itertools import batched, chain, combinations_with_replacement, cycle, pairwise, permutations
from test.support import threading_helper


Expand Down Expand Up @@ -48,6 +48,13 @@ def test_combinations_with_replacement(self):
it = combinations_with_replacement(tuple(range(2)), 2)
threading_helper.run_concurrently(work_iterator, nthreads=6, args=[it])

@threading_helper.reap_threads
def test_pairwise(self):
number_of_iterations = 10
for _ in range(number_of_iterations):
it = pairwise(tuple(range(100)))
threading_helper.run_concurrently(work_iterator, nthreads=10, args=[it])

@threading_helper.reap_threads
def test_permutations(self):
number_of_iterations = 6
Expand Down