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diff --git a/LibOVRKernel/Src/Kernel/OVR_Callbacks.cpp b/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 2014 Oculus VR, LLC All Rights reserved.
+
+Licensed under the Oculus VR Rift SDK License Version 3.2 (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
+
+http://www.oculusvr.com/licenses/LICENSE-3.2 
+
+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::EmitterLock;
+
+
+} // namespace OVR