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gh-140476: Optimize PySet_Add() for frozenset in free-threading #140440

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Merged
kumaraditya303 merged 6 commits into from
Nov 11, 2025
Merged

gh-140476: Optimize PySet_Add() for frozenset in free-threading #140440

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d1aaf9a
Optimize PySet_Add for uniquely referenced sets in free-threading
yoney Oct 21, 2025
37ac4ce
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yoney Oct 22, 2025
48a4017
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yoney Oct 22, 2025
0932e16
Only for frozenset
yoney Oct 23, 2025
68ecfe5
Fix the condition
yoney Oct 23, 2025
c22066f
Merge branch 'main' into ft_set_frozenset
kumaraditya303 Nov 2, 2025
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@yoney
yoney committed Oct 22, 2025
commit 37ac4ce442fe622dd41410dabd272cec7026d3af
6 changes: 3 additions & 3 deletions Objects/setobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2774,9 +2774,9 @@ int
PySet_Add(PyObject *anyset, PyObject *key)
{
if (_PyObject_IsUniquelyReferenced(anyset) && PyAnySet_Check(anyset)) {
// In free-threading, if the set or frozenset is uniquely referenced,
// no critical section is needed since only the owner thread is
// populating it.
// We can only change frozensets if they are uniquely referenced,
// and we can avoid locking sets even in free-threaded build if they
// are uniquely referenced.
return set_add_key((PySetObject *)anyset, key);
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}

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