Hi Jan, thanks for your response. Changing the order of cleanup solved the problem!
Regards Mathias > M. Koehrer wrote: > > Hi everybody, > > > > I have one strange issue with rtnet (latest SVN version and RTAI 3.3 on a > SMP Pentium 4, kernel 2.6.16): > > In my application I do regularly UDP reads using rt_dev_recv with a fairly > long timeout (12 seconds). > > The timeout is set before using rt_dev_ioctl(...RTNET_IOCTL_TIMEOUT). > > This works fine. > > However, while shuting down my application and rtnet while I am still > waiting for the timeout > > I get the error message from RTDM: RTDM: device still in use - waiting > for release... > > Up to this point I have performed the following steps: > > rmmod my kernel module > > rtifconfig down > > rmmod rt_eepro100 > > It is not possible any more to rmmod rtipv4 and I have to restart my PC to > continue. > > Check /proc/rtai/rtdm/open_fildes. There should be at least one stalled > file descriptor be displayed. You can clean it up with "echo <fd> > > /proc/rtai/rtdm/open_fildes". > > > If I wait longer than my timeout time, I can shut down everything without > any problem. > > > > More details: > > I use a kernel module for UDP communication. > > In the cleanup_module I do a rt_task_suspend() followed by a > rt_task_delete(). > > Then rt_dev_close(sock) is called. The creation of the socket is done in > init_module, not in the task! > > That's a more or less broken cleanup scheme (killing tasks at arbitrary > execution points is always fragile). Take a look at existing examples: > first close the socket some RT-task is blocking on. This will wake it up > and let the call return with an error. You can then safely > self-terminate your task while the triggering non-RT task joins on it > (or polls for its termination). Doing it the other way around causes > this kind of deadlock. Hope we will solve this in the future by > per-process RT-resource cleanup. RTDM and RTnet are at least prepared > for this. > > Jan > > > > -------------------------------- > > > > -------------------------------- > > _______________________________________________ > RTnet-users mailing list > RTnet-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/rtnet-users > -- Mathias Koehrer [EMAIL PROTECTED] Viel oder wenig? Schnell oder langsam? Unbegrenzt surfen + telefonieren ohne Zeit- und Volumenbegrenzung? DAS TOP ANGEBOT JETZT bei Arcor: günstig und schnell mit DSL - das All-Inclusive-Paket für clevere Doppel-Sparer, nur 44,85 inkl. DSL- und ISDN-Grundgebühr! http://www.arcor.de/rd/emf-dsl-2 _______________________________________________ RTnet-users mailing list RTnet-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rtnet-users
