Re: [Xenomai-help] Three questions about RTDM

[Jan Kiszka <jan.kiszka@domain.hid>]

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Alessio Igor Bogani wrote:
> Hi Jan,
> 
> [RTDM Docs]
>>> I would be very happy to see for RTDM something similar to Xenomai's
>>> Native-API-Tour.
>> Would be nice - just takes /someone/ to write it... :-/
> 
> Ok :-)
> 
>> Maybe this paper can provide a few further hints meanwhile:
>>
>> ftp://ftp.realtimelinuxfoundation.org/pub/events/rtlws-2005/JanKiszka.pdf
> 
> Wow! Can you put this document in Technical articles section in
> Xenomai's site? I think that this document could be useful for others. 

Yes, this should be done indeed.

@All: How to include this in the SVN and later the website? As PDF only
or also in source code form (it's latex).

> 
> [heartbeat example]
>>> Mysteriously heartbeat.ko module resulted is dependent from
>>> latency_rt.ko module (present in testsuite\klatency in Xenomai package)
>>> for a reason that i don't understand. :-(
>>> How can resolve this problem?
>> Due to which symbol? Which Xenomai version precisely? Indeed very
>> strange. Something must be broken in your build.
> 
> Xenomai 2.0.3
> 
> Heartbeat.ko is loaded but not start and rtdm_task_init() return a -11
> error code (EAGAIN?). If i load latency_rt.ko before to load
> heartbeat.ko this work perfectly.
> I suppose that heartbeat.ko should do start a timer, or not?

RTDM does not know any abstraction for the system timer. That's intended
because only the native skin currently controls it at API level, all
others via a module parameter. So, to test heartbeat, you just have to
load any skin or application that starts the timer. "insmod xeno_posix"
does this job e.g.

Jan



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