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+/************************************************************************************
+
+Filename : OVR_Linux_DeviceManager.h
+Content : Linux-specific DeviceManager header.
+Created :
+Authors :
+
+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_Linux_DeviceManager_h
+#define OVR_Linux_DeviceManager_h
+
+#include "OVR_DeviceImpl.h"
+
+#include <unistd.h>
+#include <sys/poll.h>
+
+
+namespace OVR { namespace Linux {
+
+class DeviceManagerThread;
+
+//-------------------------------------------------------------------------------------
+// ***** Linux DeviceManager
+
+class DeviceManager : public DeviceManagerImpl
+{
+public:
+ DeviceManager();
+ ~DeviceManager();
+
+ // Initialize/Shutdowncreate and shutdown manger 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;
+
+ Ptr<DeviceManagerThread> pThread;
+};
+
+//-------------------------------------------------------------------------------------
+// ***** Device Manager Background Thread
+
+class DeviceManagerThread : public Thread, public ThreadCommandQueue
+{
+ friend class DeviceManager;
+ enum { ThreadStackSize = 64 * 1024 };
+public:
+ DeviceManagerThread();
+ ~DeviceManagerThread();
+
+ virtual int Run();
+
+ // ThreadCommandQueue notifications for CommandEvent handling.
+ virtual void OnPushNonEmpty_Locked() { write(CommandFd[1], this, 1); }
+ virtual void OnPopEmpty_Locked() { }
+
+ class Notifier
+ {
+ public:
+ // Called when I/O is received
+ virtual void OnEvent(int i, int fd) = 0;
+
+ // Called when timing ticks are updated.
+ // Returns the largest number of seconds this function can
+ // wait till next call.
+ virtual double OnTicks(double tickSeconds)
+ {
+ OVR_UNUSED1(tickSeconds);
+ return 1000.0;
+ }
+ };
+
+ // Add I/O notifier
+ bool AddSelectFd(Notifier* notify, int fd);
+ bool RemoveSelectFd(Notifier* notify, int fd);
+
+ // Add notifier that will be called at regular intervals.
+ bool AddTicksNotifier(Notifier* notify);
+ bool RemoveTicksNotifier(Notifier* notify);
+
+private:
+
+ bool threadInitialized() { return CommandFd[0] != 0; }
+
+ // pipe used to signal commands
+ int CommandFd[2];
+
+ Array<struct pollfd> PollFds;
+ Array<Notifier*> FdNotifiers;
+
+ Event StartupEvent;
+
+ // Ticks notifiers - used for time-dependent events such as keep-alive.
+ Array<Notifier*> TicksNotifiers;
+};
+
+}} // namespace Linux::OVR
+
+#endif // OVR_Linux_DeviceManager_h