8000 gh-123471: Make concurrent iteration over itertools.pairwise safe under free-threading by eendebakpt · Pull Request #123848 · python/cpython · GitHub
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gh-123471: Make concurrent iteration over itertools.pairwise safe under free-threading #123848

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gh-123471: Make concurrent iteration over itertools.pairwise safe under free-threading #123848

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a50c07b
Make concurrent iteration over pairwise safe under free-threading
eendebakpt Sep 7, 2024
eed6486
make setting po->old atomic
eendebakpt Sep 8, 2024
8493433
atomic exchanges
eendebakpt Sep 8, 2024
00f3e34
📜🤖 Added by blurb_it.
blurb-it[bot] Sep 8, 2024
f93d93a
add missing incref/decref pair
eendebakpt Sep 8, 2024
ae9ed99
Merge branch 'pairwise_ft_v2' of github.com:eendebakpt/cpython into p…
eendebakpt Sep 8, 2024
82e0489
fix whatsnew; optimize incref on new
eendebakpt Sep 8, 2024
8e4d77e
add missing tests
eendebakpt Sep 9, 2024
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add missing incref/decref pair
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@eendebakpt
eendebakpt committed Sep 8, 2024
commit f93d93a093dc714f8033d4e6cb34e246d04dec45
7 changes: 6 additions & 1 deletion Modules/itertoolsmodule.c
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Expand Up @@ -390,6 +390,8 @@ pairwise_next(pairwiseobject *po)
_Py_atomic_store_int_relaxed(&po->iterator_exhausted, 1);
return NULL;
}
// we need to incref new before handing it over to po->old
Py_INCREF(new);
old = ( PyObject *)_Py_atomic_exchange_ptr(&po->old, new);
// we have acquired old and we hold a reference to it
#endif
Expand Down Expand Up @@ -420,7 +422,10 @@ pairwise_next(pairwiseobject *po)
#ifndef Py_GIL_DISABLED
Py_XSETREF(po->old, new);
#else
// update was already done
// update to old was already done, but we still have to decref new
// note: we can avoid the incref/decref on new, but this would duplicate a
// bit more code from the normal and free-threading build
Py_DECREF(new);
#endif

Py_DECREF(old);
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