XnStatus xnUSBPlatformSpecificInit()
{
xnLogVerbose(XN_MASK_USB, "Initializing USB...");
// initialize the library
int rc = libusb_init(&g_InitData.pContext);
if (rc != 0)
{
return (XN_STATUS_USB_INIT_FAILED);
}
XnStatus nRetVal = xnOSCreateCriticalSection(&g_InitData.hLock);
XN_IS_STATUS_OK(nRetVal);
#ifdef XN_USE_UDEV
// initialize the UDEV Events thread
g_bShouldRunUDEVThread = true;
nRetVal = xnOSCreateThread(xnUSBUDEVEventsThread, NULL, &g_hUDEVThread);
if (nRetVal != XN_STATUS_OK)
{
g_hUDEVThread = NULL;
g_bShouldRunUDEVThread = false;
// clean-up
xnUSBPlatformSpecificShutdown();
return nRetVal;
}
#endif
//libusb_set_debug(g_InitData.pContext, 3);
xnLogInfo(XN_MASK_USB, "USB is initialized.");
return (XN_STATUS_OK);
}
XnStatus xnUSBAsynchThreadAddRef()
{
XnStatus nRetVal = XN_STATUS_OK;
xnl::AutoCSLocker locker(g_InitData.hLock);
++g_InitData.nOpenDevices;
if (g_InitData.hThread == NULL)
{
xnLogVerbose(XN_MASK_USB, "Starting libusb asynch thread...");
// mark thread should run
g_InitData.bShouldThreadRun = TRUE;
// and start thread
nRetVal = xnOSCreateThread(xnUSBHandleEventsThread, NULL, &g_InitData.hThread);
if (nRetVal != XN_STATUS_OK)
{
// clean-up
xnUSBPlatformSpecificShutdown();
return nRetVal;
}
// set thread priority to critical
nRetVal = xnOSSetThreadPriority(g_InitData.hThread, XN_PRIORITY_CRITICAL);
if (nRetVal != 0)
{
xnLogWarning(XN_MASK_USB, "USB events thread: Failed to set thread priority to critical. This might cause loss of data...");
printf("Warning: USB events thread - failed to set priority. This might cause loss of data...\n");
}
}
return (XN_STATUS_OK);
}
XN_C_API XnStatus xnUSBShutdown()
{
XnStatus nRetVal = XN_STATUS_OK;
if (g_bUSBWasInit == TRUE)
{
nRetVal = xnUSBPlatformSpecificShutdown();
XN_IS_STATUS_OK(nRetVal);
g_bUSBWasInit = FALSE;
}
else
{
return (XN_STATUS_USB_NOT_INIT);
}
return (XN_STATUS_OK);
}
