[Xenomai-help] POSIX API
I am looking for all POSIX functions of Linux, i wonder if any body has POSIX.1-2008 manual or IEEE1003.1 or a similar document. Does xenomai change libc.a ? As far as I understood, xenomai adds new functions(they start with rt_), besides it changes some of posix functions while it keeps some posix functions untouched. Is there any book regarding to the real time programming in xenomai? Sorry for too many questions... Regards ___ Xenomai-help mailing list Xenomai-help@gna.org https://mail.gna.org/listinfo/xenomai-help
Re: [Xenomai-help] POSIX API
On 05/15/2012 10:02 AM, ali hagigat wrote: I am looking for all POSIX functions of Linux, i wonder if any body has POSIX.1-2008 manual or IEEE1003.1 or a similar document. Does xenomai change libc.a ? As far as I understood, xenomai adds new functions(they start with rt_), besides it changes some of posix functions while it keeps some posix functions untouched. Functions which start with rt_ are part of the native skin. The implementation of the posix skin does not change libc.a, it implements a new library libpthread_rt.so, and the function substitution is done at link-edition time by using the linker --wrap option. Is there any book regarding to the real time programming in xenomai? You can start here: http://www.xenomai.org/index.php/Included_documentation_summary For instance the --wrap trick is explained here: http://www.xenomai.org/index.php/Porting_POSIX_applications_to_Xenomai#Under_the_hood:_the_--wrap_flag -- Gilles. ___ Xenomai-help mailing list Xenomai-help@gna.org https://mail.gna.org/listinfo/xenomai-help
Re: [Xenomai-help] Xenomai on the TS-7553 ARM SBC
To summarize, there are two states in the system: Either Linux is handling the timer, in which case: - ipipe_mach_timerstolen == 0 - ipipe_mach_acktimer is called to acknowledge the linux timer interrupt - linux timer interrupt routine is called for each timer interrupt, HZ times a second, and in charge to reprogram the timer hardware if it needs to be reprogrammed Either xenomai is handling the timer, in which case: - ipipe_mach_timerstolen == 1 - ipipe_mach_acktimer is called to acknowledge the xenomai timer interrupt - ipipe_mach_set_dec is called by xenomai to program the next timer interrupt linux timer interrupt is called HZ times a second, but should not touch anything related to the timer hardware, because that part is handled by xenomai now (vie ipipe_mach_set_dec). if CONFIG_IPIPE is enabled and CONFIG_XENOMI is disabled, only the first state happens. if CONFIG_XENOMAI is enabled, as soon as xenomai is started, we enter the second state. Ok this is pretty much what I understood but my problem was that ipipe_mach_set_dec was never called once the skin services were started. I really didn't see how my code could influence this so I checked the bug fixes for Xenomai 2.5 and i found one which was not fixed in my version of xenomai. The bug was the return value of rthal_timer_request. I applied the fix and Xenomai is now booting fine on my TS-7553. I will now perform tests on it to insure the stability of the system and the latency. Thank you very much for your help, Best regards, -- Aubin REBILLAT ___ Xenomai-help mailing list Xenomai-help@gna.org https://mail.gna.org/listinfo/xenomai-help
Re: [Xenomai-help] Xenomai on the TS-7553 ARM SBC
On 05/15/2012 04:34 PM, aubin.rebil...@free.fr wrote: I really didn't see how my code could influence this so I checked the bug fixes for Xenomai 2.5 and i found one which was not fixed in my version of xenomai. The bug was the return value of rthal_timer_request. Oh, I missed that, don't do that. Please use Xenomai 2.6. It is backward compatible with old I-pipe patches. -- Gilles. ___ Xenomai-help mailing list Xenomai-help@gna.org https://mail.gna.org/listinfo/xenomai-help
