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gh-123471: Make concurrent iteration over itertools.repeat safe under free-threading (#131247)

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Pieter Eendebak 2025-04-13 09:56:58 +02:00 • committed by GitHub
parent 5863cd70b8
commit 9d127e83b9
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2 changed files with 8 additions and 3 deletions
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10
Modules/itertoolsmodule.c
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@ -3628,10 +3628,14 @@ static PyObject *
repeat_next(PyObject *op)
{
repeatobject *ro = repeatobject_CAST(op);
if (ro->cnt == 0)
Py_ssize_t cnt = FT_ATOMIC_LOAD_SSIZE_RELAXED(ro->cnt);
if (cnt == 0) {
return NULL;
if (ro->cnt > 0)
ro->cnt--;
}
if (cnt > 0) {
cnt--;
FT_ATOMIC_STORE_SSIZE_RELAXED(ro->cnt, cnt);
}
return Py_NewRef(ro->element);
}