https://github.com/python/cpython/commit/c1417487e98e270d614965ed78ff9439044b65a6
commit: c1417487e98e270d614965ed78ff9439044b65a6
branch: main
author: Sam Gross <[email protected]>
committer: colesbury <[email protected]>
date: 2025-01-10T00:59:10Z
summary:
gh-128691: Use deferred reference counting on `_thread._local` (#128693)
This change, along with the LOAD_ATTR specializations, makes the
"thread_local_read" micro benchmark in Tools/ftscalingbench/ftscalingbench.py
scale well to multiple threads.
files:
M Modules/_threadmodule.c
diff --git a/Modules/_threadmodule.c b/Modules/_threadmodule.c
index 2cbdfeb09b95ae..d19ae326bd6b48 100644
--- a/Modules/_threadmodule.c
+++ b/Modules/_threadmodule.c
@@ -1414,6 +1414,10 @@ local_new(PyTypeObject *type, PyObject *args, PyObject
*kw)
return NULL;
}
+ // gh-128691: Use deferred reference counting for thread-locals to avoid
+ // contention on the shared object.
+ _PyObject_SetDeferredRefcount((PyObject *)self);
+
self->args = Py_XNewRef(args);
self->kw = Py_XNewRef(kw);
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