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diff --git a/ovr_sdk_win_23.0.0/LibOVRKernel/Src/Kernel/OVR_Callbacks.cpp b/ovr_sdk_win_23.0.0/LibOVRKernel/Src/Kernel/OVR_Callbacks.cpp
new file mode 100644
index 0000000..0ae91f8
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+++ b/ovr_sdk_win_23.0.0/LibOVRKernel/Src/Kernel/OVR_Callbacks.cpp
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+/************************************************************************************
+
+PublicHeader:   Kernel
+Filename    :   OVR_Callbacks.cpp
+Content     :   Callback library
+Created     :   Nov 17, 2014
+Author      :   Chris Taylor
+
+Copyright   :   Copyright (c) Facebook Technologies, LLC and its affiliates. All rights reserved.
+
+Licensed under the Oculus Master SDK License Version 1.0 (the "License");
+you may not use the Oculus VR Rift SDK except in compliance with the License,
+which is provided at the time of installation or download, or which
+otherwise accompanies this software in either electronic or hard copy form.
+
+You may obtain a copy of the License at
+
+https://developer.oculus.com/licenses/oculusmastersdk-1.0
+
+Unless required by applicable law or agreed to in writing, the Oculus VR SDK
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+************************************************************************************/
+
+#include "OVR_Callbacks.h"
+
+namespace OVR {
+
+// Global emitter lock
+//
+// Add/remove operations on callbacks happen infrequently, and are already fairly
+// serialized in order of construction by design.  Therefore contention for this
+// lock between call()/shutdown() is the main concern and is also rare.
+Lock* CallbackEmitterBase::GetEmitterLock() {
+  static Lock lock;
+  return &lock;
+}
+
+} // namespace OVR