From 9e10f232782d7d4f61ce526394616957628c7e37 Mon Sep 17 00:00:00 2001
From: Gregory Gay <gregory.gay@diamond.ac.uk>
Date: Wed, 5 Nov 2025 15:41:30 +0000
Subject: [PATCH 1/2] Add 'callbackSetQueueSize' function This function is used
 to change the callback buffer limit. See Epics AppDevGuide, Callback Queue
 section (16.2.4) 
 https://epics.anl.gov/base/R3-14/12-docs/AppDevGuide/node17.html

---
 softioc/imports.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/softioc/imports.py b/softioc/imports.py
index 24754349..a54fc8ee 100644
--- a/softioc/imports.py
+++ b/softioc/imports.py
@@ -86,6 +86,9 @@ def from_param(cls, value):
 dbLoadDatabase.argtypes = (auto_encode, auto_encode, auto_encode)
 dbLoadDatabase.errcheck = expect_success
 
+callbackSetQueueSize = dbCore.callbackSetQueueSize
+callbackSetQueueSize.argtypes = (c_int,)
+callbackSetQueueSize.errcheck = expect_success
 
 # unsigned short recGblResetAlarms(void *precord)
 #
@@ -116,5 +119,6 @@ def from_param(cls, value):
     'registryDeviceSupportAdd',
     'IOSCANPVT', 'scanIoRequest', 'scanIoInit',
     'dbLoadDatabase',
+    'callbackSetQueueSize',
     'recGblResetAlarms',
 ]

From 92d49423c332eb204a1ceb9d452a840d16863989 Mon Sep 17 00:00:00 2001
From: Gregory Gay <gregory.gay@diamond.ac.uk>
Date: Mon, 24 Nov 2025 16:13:35 +0000
Subject: [PATCH 2/2] Add changelog entry

---
 CHANGELOG.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index b80ef847..b1531d2e 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -10,7 +10,9 @@ Versioning <https://semver.org/spec/v2.0.0.html>`_.
 Unreleased_
 -----------
 
-Nothing yet
+Added:
+
+- `Add support to change the callback buffer limit <../../pull/194>`_
 
 4.6.1_ - 2025-04-22
 -------------------