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+/************************************************************************************
+
+Filename    :   Util_LongPollThread.h
+Content     :   Allows us to do all long polling tasks from a single thread to minimize deadlock risk
+Created     :   June 30, 2013
+Authors     :   Chris Taylor
+
+Copyright   :   Copyright 2014 Oculus VR, Inc. All Rights reserved.
+
+Licensed under the Oculus VR Rift SDK License Version 3.1 (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-3.1 
+
+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.
+
+*************************************************************************************/
+
+#ifndef OVR_Util_LongPollThread_h
+#define OVR_Util_LongPollThread_h
+
+#include "../Kernel/OVR_Timer.h"
+#include "../Kernel/OVR_Atomic.h"
+#include "../Kernel/OVR_Allocator.h"
+#include "../Kernel/OVR_String.h"
+#include "../Kernel/OVR_System.h"
+#include "../Kernel/OVR_Threads.h"
+#include "../Kernel/OVR_Observer.h"
+
+namespace OVR { namespace Util {
+
+
+//-----------------------------------------------------------------------------
+// LongPollThread
+
+// This thread runs long-polling subsystems that wake up every second or so
+// The motivation is to reduce the number of threads that are running to minimize the risk of deadlock
+class LongPollThread : public Thread, public SystemSingletonBase<LongPollThread>
+{
+    OVR_DECLARE_SINGLETON(LongPollThread);
+    virtual void OnThreadDestroy();
+
+public:
+    typedef Delegate0<void> PollFunc;
+    static const int WakeupInterval = 1000; // milliseconds
+
+    void AddPollFunc(Observer<PollFunc>* func);
+
+    void Wake();
+
+protected:
+    ObserverScope<PollFunc> PollSubject;
+
+    bool Terminated;
+    Event WakeEvent;
+    void fireTermination();
+
+    virtual int Run();
+};
+
+
+}} // namespace OVR::Util
+
+#endif // OVR_Util_LongPollThread_h