From f2ca1581cab2da45880198af1c924dd40ec8a10b Mon Sep 17 00:00:00 2001
From: Chris Eibl <138194463+chris-eibl@users.noreply.github.com>
Date: Sat, 29 Nov 2025 21:43:06 +0100
Subject: [PATCH 1/2] GH-141808: Do not generate the jit stencils twice in case
 of PGO builds on Windows. (GH-142043)

* do not build the jit stencils twice in case of PGO builds on Windows

* blurb it
---
 .../next/Build/2025-11-28-19-49-01.gh-issue-141808.cV5K12.rst    | 1 +
 PCbuild/pyproject.props                                          | 1 +
 2 files changed, 2 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Build/2025-11-28-19-49-01.gh-issue-141808.cV5K12.rst

diff --git a/Misc/NEWS.d/next/Build/2025-11-28-19-49-01.gh-issue-141808.cV5K12.rst b/Misc/NEWS.d/next/Build/2025-11-28-19-49-01.gh-issue-141808.cV5K12.rst
new file mode 100644
index 00000000000000..3162c7c41418cc
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2025-11-28-19-49-01.gh-issue-141808.cV5K12.rst
@@ -0,0 +1 @@
+Do not generate the jit stencils twice in case of PGO builds on Windows.
diff --git a/PCbuild/pyproject.props b/PCbuild/pyproject.props
index cf35e705f355a7..53bfe5e3ea95cc 100644
--- a/PCbuild/pyproject.props
+++ b/PCbuild/pyproject.props
@@ -13,6 +13,7 @@
     <GeneratedFrozenModulesDir>$(Py_IntDir)\$(MajorVersionNumber)$(MinorVersionNumber)_frozen\</GeneratedFrozenModulesDir>
     <GeneratedZlibNgDir>$(Py_IntDir)\$(MajorVersionNumber)$(MinorVersionNumber)$(ArchName)_$(Configuration)\zlib-ng\</GeneratedZlibNgDir>
     <GeneratedJitStencilsDir>$(Py_IntDir)\$(MajorVersionNumber)$(MinorVersionNumber)_$(Configuration)</GeneratedJitStencilsDir>
+    <GeneratedJitStencilsDir Condition="$(Configuration) == 'PGUpdate'">$(Py_IntDir)\$(MajorVersionNumber)$(MinorVersionNumber)_PGInstrument</GeneratedJitStencilsDir>
     <TargetName Condition="'$(TargetName)' == ''">$(ProjectName)</TargetName>
     <TargetName>$(TargetName)$(PyDebugExt)</TargetName>
     <GenerateManifest>false</GenerateManifest>

From db098a475a47b16d25c88d95dbcf0c6572c68576 Mon Sep 17 00:00:00 2001
From: Duprat <yduprat@gmail.com>
Date: Sat, 29 Nov 2025 23:12:48 +0100
Subject: [PATCH 2/2] gh-133146: Add the old public `get_value` method to
 documentation and refactor code. (GH-133301)

also uses it within the internals in a few places.
---
 Doc/library/multiprocessing.rst    | 10 ++++++++++
 Lib/multiprocessing/queues.py      |  2 +-
 Lib/multiprocessing/synchronize.py | 13 +++++++++----
 3 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/Doc/library/multiprocessing.rst b/Doc/library/multiprocessing.rst
index 714207cb0aefcd..cbc98b256a93a4 100644
--- a/Doc/library/multiprocessing.rst
+++ b/Doc/library/multiprocessing.rst
@@ -1577,12 +1577,22 @@ object -- see :ref:`multiprocessing-managers`.
    A solitary difference from its close analog exists: its ``acquire`` method's
    first argument is named *block*, as is consistent with :meth:`Lock.acquire`.
 
+
+   .. method:: get_value()
+
+      Return the current value of semaphore.
+
+      Note that this may raise :exc:`NotImplementedError` on platforms like
+      macOS where ``sem_getvalue()`` is not implemented.
+
+
    .. method:: locked()
 
       Return a boolean indicating whether this object is locked right now.
 
       .. versionadded:: 3.14
 
+
 .. note::
 
    On macOS, ``sem_timedwait`` is unsupported, so calling ``acquire()`` with
diff --git a/Lib/multiprocessing/queues.py b/Lib/multiprocessing/queues.py
index 925f043900004e..981599acf5ef26 100644
--- a/Lib/multiprocessing/queues.py
+++ b/Lib/multiprocessing/queues.py
@@ -121,7 +121,7 @@ def get(self, block=True, timeout=None):
 
     def qsize(self):
         # Raises NotImplementedError on Mac OSX because of broken sem_getvalue()
-        return self._maxsize - self._sem._semlock._get_value()
+        return self._maxsize - self._sem.get_value()
 
     def empty(self):
         return not self._poll()
diff --git a/Lib/multiprocessing/synchronize.py b/Lib/multiprocessing/synchronize.py
index 30425047e9801a..9188114ae284c7 100644
--- a/Lib/multiprocessing/synchronize.py
+++ b/Lib/multiprocessing/synchronize.py
@@ -135,11 +135,16 @@ def __init__(self, value=1, *, ctx):
         SemLock.__init__(self, SEMAPHORE, value, SEM_VALUE_MAX, ctx=ctx)
 
     def get_value(self):
+        '''Returns current value of Semaphore.
+
+        Raises NotImplementedError on Mac OSX
+        because of broken sem_getvalue().
+        '''
         return self._semlock._get_value()
 
     def __repr__(self):
         try:
-            value = self._semlock._get_value()
+            value = self.get_value()
         except Exception:
             value = 'unknown'
         return '<%s(value=%s)>' % (self.__class__.__name__, value)
@@ -155,7 +160,7 @@ def __init__(self, value=1, *, ctx):
 
     def __repr__(self):
         try:
-            value = self._semlock._get_value()
+            value = self.get_value()
         except Exception:
             value = 'unknown'
         return '<%s(value=%s, maxvalue=%s)>' % \
@@ -247,8 +252,8 @@ def _make_methods(self):
 
     def __repr__(self):
         try:
-            num_waiters = (self._sleeping_count._semlock._get_value() -
-                           self._woken_count._semlock._get_value())
+            num_waiters = (self._sleeping_count.get_value() -
+                           self._woken_count.get_value())
         except Exception:
             num_waiters = 'unknown'
         return '<%s(%s, %s)>' % (self.__class__.__name__, self._lock, num_waiters)