I really tried to not answer this message and finish the "endless thread" you mentioned, but I couldn't resist. ;) Maybe this will be the last post from my own on this thread and will begin writing in the new thread. See below, please. ____________________________________________________________ Em Terça 14 Março 2006 17:29, Jan Kiszka escreveu:
>... > >Ok, your framework is effectively aiming for relative times here, that's >clear now. But your driver will deliver individual frames with absolute >timestamp, right? Right. >Then it's up to the user to NOT mix up these >timestamps with dates obtained from the system clock. You will have to >state this clearly! Sure, of course. No problem with that. >Moreover, when considering the TSC as high-resolution timestamp source, >this is not applicable on SMP / multicore systems. Those tend to have >unsynchronised and drifting TSCs. So if the first picture was taken on >one CPU and the second on some other... Unfortunately I can not arguee on that for now since I know almost nothing about SMP systems. I'll take a look on the topic and hopely soon I'll return you what I think about it. >> I'm not talking especifically about this application, but giving you a >> general idea of what is not possible to do currently with RTDM if the >> application set the timer to periodic. > >And as I have this general view in mind, I want to avoid that the TSC >issue gets exported via RTDM drivers to the user. That's already >problematic for the other skins, but having to write special notes all >over the documentation of dozens of driver using mixed clocks would be >very unhandy. I don't understand why adding a new function like this would change a lot the documentation. I really can not see your worries... If you could give me a practical example, maybe it would be easier for me... >I see the need for having a high-resolution timestamp aside a >low-overhead and low-resolution timer now, good, got an ally. ;) >and I think we need to look >for a way to avoid its negative sides. First I need to understand better what exactly are the negative sides... >Not sure yet if it will be >feasible, but I will come up with a new thread on this topic soon... Yes, I've seen. I'll discuss next messages there. Thank you, Rodrigo. _______________________________________________________ Yahoo! doce lar. Faça do Yahoo! sua homepage. http://br.yahoo.com/homepageset.html _______________________________________________ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
