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[3.12] gh-99113: Add a What's New Entry for PEP 684 (gh-107520) #107523

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[3.12] gh-99113: Add a What's New Entry for PEP 684 (gh-107520) #107523

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40 changes: 40 additions & 0 deletions Doc/whatsnew/3.12.rst
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Expand Up @@ -70,6 +70,10 @@ New grammar features:

* :pep:`701`: Syntactic formalization of f-strings

Interpreter improvements:

* :ref:`whatsnew312-pep684`

New typing features:

* :pep:`688`: Making the buffer protocol accessible in Python
Expand Down Expand Up @@ -277,6 +281,36 @@ The new :class:`inspect.BufferFlags` enum represents the flags that
can be used to customize buffer creation.
(Contributed by Jelle Zijlstra in :gh:`102500`.)

.. _whatsnew312-pep684:

PEP 684: A Per-Interpreter GIL
------------------------------

Sub-interpreters may now be created with a unique GIL per interpreter.
This allows Python programs to take full advantage of multiple CPU
cores.

Use the new :c:func:`Py_NewInterpreterFromConfig` function to
create an interpreter with its own GIL::

PyInterpreterConfig config = {
.check_multi_interp_extensions = 1,
.gil = PyInterpreterConfig_OWN_GIL,
};
PyThreadState *tstate = NULL;
PyStatus status = Py_NewInterpreterFromConfig(&tstate, &config);
if (PyStatus_Exception(status)) {
return -1;
}
/* The new interpeter is now active in the current thread. */

For further examples how to use the C-API for sub-interpreters with a
per-interpreter GIL, see :source:`Modules/_xxsubinterpretersmodule.c`.

A Python API is anticipated for 3.13. (See :pep:`554`.)

(Contributed by Eric Snow in :gh:`104210`, etc.)

New Features Related to Type Hints
==================================

Expand Down Expand Up @@ -1744,6 +1778,12 @@ New Features

(Contributed by Eddie Elizondo in :gh:`84436`.)

* :pep:`684`: Added the new :c:func:`Py_NewInterpreterFromConfig`
function and :c:type:`PyInterpreterConfig`, which may be used
to create sub-interpreters with their own GILs.
(See :ref:`whatsnew312-pep684` for more info.)
(Contributed by Eric Snow in :gh:`104110`.)

* In the limited C API version 3.12, :c:func:`Py_INCREF` and
:c:func:`Py_DECREF` functions are now implemented as opaque function calls to
hide implementation details.
Expand Down