DOC: Add errstate changes release note and note to setbufsize.

seberg · seberg · commit 73be58f01834 · 2023-06-14T10:25:41.000+02:00
diff --git a/doc/release/upcoming_changes/23936.change.rst b/doc/release/upcoming_changes/23936.change.rst
@@ -0,0 +1,5 @@
+* Being fully context and thread-safe, ``np.errstate`` can only
+  be entered once now.  It is possible to enter it again after
+  exiting first.
+* ``np.setbufsize`` is now tied to ``np.errstate()``:  Leaving an
+  ``np.errstate`` context will also reset the ``bufsize``.
diff --git a/doc/release/upcoming_changes/23936.improvement.rst b/doc/release/upcoming_changes/23936.improvement.rst
@@ -0,0 +1,5 @@
+``np.errstate()`` is now faster and context safe
+------------------------------------------------
+The `np.errstate` context manager/decorator is now faster and
+safer.  Previously, it was not context save and had (rarely)
+issues with thread-safety.
diff --git a/numpy/core/_ufunc_config.py b/numpy/core/_ufunc_config.py
@@ -156,6 +156,10 @@ def setbufsize(size):
     """
     Set the size of the buffer used in ufuncs.
 
+    .. versionchanged:: 2.0
+        The scope of setting the buffer is tied to the `np.errstate` context.
+        Exiting a ``with errstate():` will also restore the bufsize.
+
     Parameters
     ----------
     size : int
