From: Sam Gross <colesbury@gmail.com>
Date: Fri, 3 May 2024 15:33:05 +0000 (-0400)
Subject: gh-118527: Use deferred reference counting for C functions on modules (#118529)
X-Git-Tag: v3.13.0b1~135
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=608192ee2f6c60aaae1c6f2f64ea45ad2667ff2d;p=thirdparty%2FPython%2Fcpython.git

gh-118527: Use deferred reference counting for C functions on modules (#118529)

This addresses a scaling bottleneck in the free-threaded build when
calling functions like `math.floor()` concurrently from multiple
threads.
---

diff --git a/Objects/moduleobject.c b/Objects/moduleobject.c
index d877edaf5453..a570b13e1208 100644
--- a/Objects/moduleobject.c
+++ b/Objects/moduleobject.c
@@ -183,6 +183,7 @@ _add_methods_to_object(PyObject *module, PyObject *name, PyMethodDef *functions)
         if (func == NULL) {
             return -1;
         }
+        _PyObject_SetDeferredRefcount(func);
         if (PyObject_SetAttrString(module, fdef->ml_name, func) != 0) {
             Py_DECREF(func);
             return -1;