8000 gh-123471: Make concurrent iteration over itertools.repeat safe under free-threading by eendebakpt · Pull Request #131247 · python/cpython · GitHub
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gh-123471: Make concurrent iteration over itertools.repeat safe under free-threading #131247

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Merged
merged 3 commits into from
Apr 13, 2025
Merged

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

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bc30930
make repeat_next ft safe
eendebakpt Mar 14, 2025
2037e3d
📜🤖 Added by blurb_it.
blurb-it[bot] Mar 14, 2025
65daaee
fix
eendebakpt Mar 14, 2025
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2025-03-14-14-18-49.gh-issue-123471.sduBKk.rst
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@@ -0,0 +1 @@
Make concurrent iterations over :class:`itertools.repeat` safe under free-threading.
10 changes: 7 additions & 3 deletions Modules/itertoolsmodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3630,10 +3630,14 @@ 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);
}

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