public static extern RETURN_CODE PlxIntrAttach(IntPtr handle, PLX_INTR plx_intr, ref IntPtr eventhandle);
public static extern RETURN_CODE PlxIntrEnable(IntPtr handle, ref PLX_INTR plx_intr);
public static extern RETURN_CODE PlxIntrStatusGet(IntPtr handle, ref PLX_INTR plx_intr);