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+/************************************************************************************
+
+Filename    :   OVR_OSX_DeviceManager.h
+Content     :   OSX specific DeviceManager header.
+Created     :   March 14, 2013
+Authors     :   Lee Cooper
+
+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_OSX_DeviceManager_h
+#define OVR_OSX_DeviceManager_h
+
+#include "OVR_DeviceImpl.h"
+
+#include "Kernel/OVR_Timer.h"
+
+#include <ApplicationServices/ApplicationServices.h>
+#include <IOKit/hid/IOHIDManager.h>
+
+namespace OVR { namespace OSX {
+
+class DeviceManagerThread;
+
+//-------------------------------------------------------------------------------------
+// ***** OSX DeviceManager
+
+class DeviceManager : public DeviceManagerImpl
+{
+public:
+    DeviceManager();
+    ~DeviceManager();
+
+    // Initialize/Shutdown manager thread.
+    virtual bool Initialize(DeviceBase* parent);
+    virtual void Shutdown();
+
+    virtual ThreadCommandQueue* GetThreadQueue();
+    virtual ThreadId GetThreadId() const;
+    
+    virtual DeviceEnumerator<> EnumerateDevicesEx(const DeviceEnumerationArgs& args);
+
+    virtual bool  GetDeviceInfo(DeviceInfo* info) const;
+
+protected:
+    static void displayReconfigurationCallBack (CGDirectDisplayID display,
+                                                CGDisplayChangeSummaryFlags flags,
+                                                void *userInfo);
+  
+public: // data
+    Ptr<DeviceManagerThread> pThread;
+};
+
+//-------------------------------------------------------------------------------------
+// ***** Device Manager Background Thread
+
+class DeviceManagerThread : public Thread, public ThreadCommandQueue
+{
+    friend class DeviceManager;
+    enum { ThreadStackSize = 32 * 1024 };
+public:
+    DeviceManagerThread();
+    ~DeviceManagerThread();
+
+    virtual int Run();
+
+    // ThreadCommandQueue notifications for CommandEvent handling.
+    virtual void OnPushNonEmpty_Locked()
+    {
+        CFRunLoopSourceSignal(CommandQueueSource);
+        CFRunLoopWakeUp(RunLoop);
+    }
+    
+    virtual void OnPopEmpty_Locked()     {}
+
+
+    // Notifier used for different updates (EVENT or regular timing or messages).
+    class Notifier  
+    {
+    public:
+
+        // Called when timing ticks are updated. // Returns the largest number of microseconds
+        // this function can wait till next call.
+        virtual double  OnTicks(double tickSeconds)
+        { OVR_UNUSED1(tickSeconds);  return 1000.0; }
+    };
+ 
+    // Add notifier that will be called at regular intervals. 
+    bool AddTicksNotifier(Notifier* notify);
+    bool RemoveTicksNotifier(Notifier* notify);
+
+    CFRunLoopRef        GetRunLoop()
+    { return RunLoop; }
+    
+    void                Shutdown();
+private:
+    CFRunLoopRef        RunLoop;
+
+    CFRunLoopSourceRef  CommandQueueSource;
+    
+    static void staticCommandQueueSourceCallback(void* pContext);
+    void commandQueueSourceCallback();
+
+    Event               StartupEvent;
+    
+    // Ticks notifiers. Used for time-dependent events such as keep-alive.
+    Array<Notifier*>    TicksNotifiers;
+};
+
+}} // namespace OSX::OVR
+
+#endif // OVR_OSX_DeviceManager_h