/// <summary>
        /// 
        /// </summary>
        public CudaStopWatch()
        {
            _start = new CudaEvent();
			_stop = new CudaEvent();
            _stream = new CUstream();

        }

        /// <summary>
        /// Creates a new Stream
        /// </summary>
        /// <param name="flags">Parameters for stream creation (must be <see cref="CUStreamFlags.None"/>)</param>
        public CudaStream(CUStreamFlags flags)
        {
            _stream = new CUstream();

            res = DriverAPINativeMethods.Streams.cuStreamCreate(ref _stream, flags);
            Debug.WriteLine(String.Format("{0:G}, {1}: {2}", DateTime.Now, "cuStreamCreate", res));
            if (res != CUResult.Success) throw new CudaException(res);
			_isOwner = true;
        }

			public static extern CUResult cuStreamCreateWithPriority(ref CUstream phStream, CUStreamFlags flags, int priority);

 public static extern CUResult  cuStreamWaitEvent(CUstream hStream, CUevent hEvent, uint Flags);

			public static extern CUResult cuStreamAddCallback(CUstream hStream, CUstreamCallback callback, IntPtr userData, CUStreamAddCallbackFlags flags);

 public static extern CUResult cuMemcpyDtoHAsync_v2([Out] IntPtr dstHost, CUdeviceptr srcDevice, SizeT ByteCount, CUstream hStream);

 public static extern CUResult cuMemcpyAtoHAsync_v2([Out] IntPtr dstHost, CUarray srcArray, SizeT srcOffset, SizeT ByteCount, CUstream hStream);

			public static extern CUResult cuStreamAttachMemAsync(CUstream hStream, CUdeviceptr dptr, SizeT length, CUmemAttach_flags flags);

 public static extern CUResult cuGraphicsUnmapResources(uint count, CUgraphicsResource[] resources, CUstream hStream);           

 public static extern CUResult cuLaunchKernel(CUfunction f,
                     uint gridDimX,
                     uint gridDimY,
                     uint gridDimZ,
                     uint blockDimX,
                     uint blockDimY,
                     uint blockDimZ,
                     uint sharedMemBytes,
                     CUstream hStream,
                     IntPtr[] kernelParams,
                     IntPtr[] extra);

 public static extern CUResult cuEventRecord( CUevent hEvent, CUstream hStream );

 public static extern CUResult cuMemsetD32Async(CUdeviceptr dstDevice, uint ui, SizeT N, CUstream hStream);

 public static extern CUResult cuMemsetD2D32Async(CUdeviceptr dstDevice, SizeT dstPitch, uint ui, SizeT Width, SizeT Height, CUstream hStream);

 public static extern CUResult cuMemsetD16Async(CUdeviceptr dstDevice, ushort us, SizeT N, CUstream hStream);

 public static extern CUResult cuMemsetD8Async(CUdeviceptr dstDevice, byte b, SizeT N, CUstream hStream);

 public static extern CUResult cuMemcpy3DAsync_v2(ref CUDAMemCpy3D pCopy, CUstream hStream);

			public static extern CUResult cuStreamGetPriority(CUstream hStream, ref int priority);

 public static extern CUResult  cuStreamCreate( ref CUstream phStream, CUStreamFlags Flags );

			public static extern CUResult cuStreamGetFlags(CUstream hStream, ref CUStreamFlags flags);

 public static extern CUResult cuGraphicsMapResources(uint count, ref CUgraphicsResource resources, CUstream hStream);