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[3.14] gh-158643: Document that Py_EnterRecursiveCall uses the C stack, not a counter (GH-158644) #158654

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ZeroIntensity merged 1 commit into from
Oct 3, 2026
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[3.14] gh-158643: Document that Py_EnterRecursiveCall uses the C stack, not a counter (GH-158644) #158654

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8 changes: 8 additions & 0 deletions Doc/c-api/exceptions.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1016,6 +1016,10 @@ because the :ref:`call protocol <call>` takes care of recursion handling.
case, a :exc:`RecursionError` is set and a nonzero value is returned.
Otherwise, zero is returned.

The check is based on the remaining C stack space of the current thread,
not on a count of calls, so it is unaffected by
:c:func:`Py_SetRecursionLimit` and :func:`sys.setrecursionlimit`.

*where* should be a UTF-8 encoded string such as ``" in instance check"`` to
be concatenated to the :exc:`RecursionError` message caused by the recursion
depth limit.
Expand All @@ -1026,6 +1030,10 @@ because the :ref:`call protocol <call>` takes care of recursion handling.
.. versionchanged:: 3.9
This function is now also available in the :ref:`limited API <limited-c-api>`.

.. versionchanged:: 3.14
The check is based on the remaining C stack space. Previously, a
separate counter of C-level calls was used.

.. c:function:: void Py_LeaveRecursiveCall(void)

Ends a :c:func:`Py_EnterRecursiveCall`. Must be called once for each
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