On Mon, 2006-09-25 at 22:40 -0300, Rodrigo Rosenfeld Rosas wrote: > Hi, it's me again, after a long while :) > > I'll present my Master thesis this Friday and I would like to comment > about the debugger. Since I'm in hurry with a lot other issues, I do not > have to time to test what I'm going to ask. > > I've never used a debugger with Xenomai (or RTAI). I mean, not GDB. I > used other techniques to debug, such as logging, etc. My doubt is: > > Suppose I have a user-space program with 3 independent Xenomai RT-tasks. > If I put a breakpoint in one of them, will the other two keep running? I > guess yes, but I'm not sure and that is why I'm asking. >
Actually, they would not. The kernel would stop all of them as a consequence of ptracing, and Xenomai would switch them back to secondary mode if needed, to let them handle the new situation properly. > Another thing. I think that the scheduler will keep counting the time > when the debugger stopped the task. So, the next call to > rt_task_wait_period() will return -ETIMEDOUT immediately, with the > overruns set accordly, if this was the case, right? > No, the outstanding RT timers are globally frozen whenever a ptraced user-space task is stopped by the debugger, exactely to prevent the case you described, so that you can step into your application without causing such annoying side-effect. Since we are breakpointing/stepping into the code, real-time accuracy doesn't matter anyway, so we act as if the timeline was being frozen each time the debugger holds the application. > Thank you all again for all the support I had while researching for my > master thesis. :) After concluding it, it will be time for starting > looking for a job. If anyone of you knows about some company that could > employ a brazilian to work with Linux based real-time systems, > preferently Xenomai, please, let me know. > > Best regards, > > Rodrigo. > > > > _______________________________________________________ > Novidade no Yahoo! Mail: receba alertas de novas mensagens no seu celular. > Registre seu aparelho agora! > http://br.mobile.yahoo.com/mailalertas/ > > > > > _______________________________________________ > Xenomai-help mailing list > [email protected] > https://mail.gna.org/listinfo/xenomai-help -- Philippe. _______________________________________________ Xenomai-help mailing list [email protected] https://mail.gna.org/listinfo/xenomai-help
