Em Segunda 13 Março 2006 15:33, Jan Kiszka escreveu: >Rodrigo Rosenfeld Rosas wrote: >> Em Segunda 13 Março 2006 14:25, Gilles Chanteperdrix escreveu: >>> Jan Kiszka wrote: >>>>> Sometimes the result is "Should be near 84000: 100000", that is kind of >>>>> correct, since the tickval is 100000, although I think that those >>>>> functions in the RTDM driver context should be independent of the tick >>>>> value set by the user program... Maybe using oneshot in the driver >>>>> calls and periodic in the application... I really don't know what would >>>>> be the best approach here... >>>> >>>> rtdm_clock_read always uses the nucleus clock. Using something different >>>> (e.g. always TSC) would break applications specifying absolute times >>>> derived from the return values of other skins' functions. >>> >>> Maybe adding a service to RTDM would allow users to measure short time >>> intervals with RTDM using the TSC ? >>> >>> The native (rt_timer_tsc()) and posix (clock_gettime(CLOCK_MONOTONIC)) >>> skins have a way to do this. >> >> This would fit great for my needs (and most developers I think)! > >Will think about it. Actually, I'm not a big fan of this. It creates the >risk that someone feeds the output of this service into (incompatible) >timed RTDM services.
Sorry, I couldn't see a practical usage of this. Could you give an example? >Even worse, this would work for aperiodic mode but fail for periodic. Actually it is only necessary on periodic modes as it already works for aperiodic mode. >We would definitely need a good name for it, >rtdm_clock_read_ex(<clock-id>), rtdm_clock_read_tsc(), >rtdm_clock_read_monotonic()? I'm not going to break rtdm_clock_read() by >adding an argument (otherwise, I would have to fix too many drivers on >my own... :-/). That is the idea, I think. I agree that rtdm_clock_read() should be kept as it is (the API/definition). No body is asking you to change it. Adding rtdm_clock_read_tsc() would be sufficient in my opinion whilst it maintain coherency with other skins. Thank you for considering it. Rodrigo. _______________________________________________________ Yahoo! Acesso Grátis - Internet rápida e grátis. Instale o discador agora! http://br.acesso.yahoo.com _______________________________________________ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
