https://github.com/python/cpython/commit/4f3253a0ccf3a512c497f779e4a6db2656c75844
commit: 4f3253a0ccf3a512c497f779e4a6db2656c75844
branch: main
author: Gregory P. Smith <g...@krypto.org>
committer: gpshead <g...@krypto.org>
date: 2024-11-11T19:19:08Z
summary:
gh-84559: gh-103134: Whats new 3.14 entries for multiprocessing. (GH-126697)
files:
M Doc/whatsnew/3.14.rst
diff --git a/Doc/whatsnew/3.14.rst b/Doc/whatsnew/3.14.rst
index 4b2a64fd0fab9c..c8f7dd162f1137 100644
--- a/Doc/whatsnew/3.14.rst
+++ b/Doc/whatsnew/3.14.rst
@@ -250,6 +250,12 @@ concurrent.futures
same process) to Python code. This is separate from the proposed API
in :pep:`734`.
(Contributed by Eric Snow in :gh:`124548`.)
+* The default ``ProcessPoolExecutor`` start method (see
+ :ref:`multiprocessing-start-methods`) changed from *fork* to *forkserver* on
+ platforms other than macOS & Windows. If you require the threading
+ incompatible *fork* start method you must explicitly request it by
+ supplying a *mp_context* to :class:`concurrent.futures.ProcessPoolExecutor`.
+ (Contributed by Gregory P. Smith in :gh:`84559`.)
ctypes
------
@@ -357,6 +363,25 @@ json
(Contributed by Trey Hunner in :gh:`122873`.)
+multiprocessing
+---------------
+
+* The default start method (see :ref:`multiprocessing-start-methods`) changed
+ from *fork* to *forkserver* on platforms other than macOS & Windows where
+ it was already *spawn*. If you require the threading incompatible *fork*
+ start method you must explicitly request it using a context from
+ :func:`multiprocessing.get_context` (preferred) or change the default via
+ :func:`multiprocessing.set_start_method`.
+ (Contributed by Gregory P. Smith in :gh:`84559`.)
+* The :ref:`multiprocessing proxy objects <multiprocessing-proxy_objects>`
+ for *list* and *dict* types gain previously overlooked missing methods:
+
+ * :meth:`!clear` and :meth:`!copy` for proxies of :class:`list`.
+ * :meth:`~dict.fromkeys`, ``reversed(d)``, ``d | {}``, ``{} | d``,
+ ``d |= {'b': 2}`` for proxies of :class:`dict`.
+
+ (Contributed by Roy Hyunjin Han for :gh:`103134`)
+
operator
--------
@@ -511,14 +536,6 @@ Deprecated
as a single positional argument.
(Contributed by Serhiy Storchaka in :gh:`109218`.)
-* :mod:`multiprocessing` and :mod:`concurrent.futures`:
- The default start method (see :ref:`multiprocessing-start-methods`) changed
- away from *fork* to *forkserver* on platforms where it was not already
- *spawn* (Windows & macOS). If you require the threading incompatible *fork*
- start method you must explicitly specify it when using :mod:`multiprocessing`
- or :mod:`concurrent.futures` APIs.
- (Contributed by Gregory P. Smith in :gh:`84559`.)
-
* :mod:`os`:
:term:`Soft deprecate <soft deprecated>` :func:`os.popen` and
:func:`os.spawn* <os.spawnl>` functions. They should no longer be used to
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