bpo-37194: Add a new public PyObject_CallNoArgs() function (GH-13890)
Add a new public PyObject_CallNoArgs() function to the C API: call a
callable Python object without any arguments.
It is the most efficient way to call a callback without any argument.
On x86-64, for example, PyObject_CallFunctionObjArgs(func, NULL)
allocates 960 bytes on the stack per call, whereas
PyObject_CallNoArgs(func) only allocates 624 bytes per call.
It is excluded from stable ABI 3.8.
Replace private _PyObject_CallNoArg() with public
PyObject_CallNoArgs() in C extensions: _asyncio, _datetime,
_elementtree, _pickle, _tkinter and readline.
diff --git a/Modules/readline.c b/Modules/readline.c
index 57335fe..930e639 100644
--- a/Modules/readline.c
+++ b/Modules/readline.c
@@ -867,7 +867,7 @@
int result = 0;
if (func != NULL) {
PyObject *r;
- r = _PyObject_CallNoArg(func);
+ r = PyObject_CallNoArgs(func);
if (r == NULL)
goto error;
if (r == Py_None)