Gilles Chanteperdrix wrote: > Philippe Gerum wrote: > > Ignacio Garc~a P~rez wrote: > > > Hi, > > > > > > I'm quite new to xenomai (switching from RTAI). I noticed that the > > > latency_rt.ko module fails to start the timer if the posix skin module > > > (xeno_posix.ko) is loaded. Is this the expected behaviour? > > > > > > > Yes and no. There is a change pending in my tree that makes > rt_time_start() a > > bit smarter, trying its best effort to check whether the requested setting > fits > > any current one, in which case the call returns without error. In the case > you > > mentioned, both timer setups at nucleus level asked for oneshot, so this > should > > have been ok with this patch, instead of bailing out on error rather > uselessly. > > The UVM skin already enforces this for instance. I have just committed it > to the > > SVN repo. > > The problem is that you also have to make the module_exit function > smarter and avoid to stop the system timer if another module is > running. This means adding a sort of reference counter to the system > timer. >
Another reason to look for a different way. The timer is a global resource, let's manage it at a central place: the nucleus (module parameter) plus maybe some sysfs variable. The days are over when skins could decide about the whole system on their own ;). And it's also much more comprehensible for the user when (s)he only has to look at one place for tuning this parameter. Jan
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