Re: [Xenomai-help] problem with installation

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

Philippe Gerum wrote:
 > > That all sounds a bit fragile configuration-wise, also given that native
 > > and posix skins are on by default and that you can enable vxworks
 > > without having to switch on periodic timer support (BTW, are the other
 > > legacy RTOS skins with this dependency?).
 > > 
 > 
 > Yes. Most of traditional RTOSes deal with periodic ticks.
 > 
 > > I would suggest to enforce the later and maybe enhance the timer
 > > initialisation interface in a way that a user/skin can request to lock
 > > the mode if it only supports one.
 > 
 > This is a LART, not a fix.
 > 
 > >  Than the latency test should fail to
 > > start, thus indicating a wrong usage. Or we "hack" periodic support over
 > > aperiodic mode, but that's a different topic.
 > > 
 > 
 > This would not be a hack, but the real fix. Keeping the periodic timing
 > handled as a separate hw-dependent mode is the real problem and the
 > source of fragility, which does not buy us anything now that we have a
 > scalable aperiodic timer management code.

It sounds a bit complicated. vxworks emulator can run over aperiodic
mode directly: the only requirement is to use tickRateGet() instead of
assuming that this function always returns 100. I guess the same goes
for other emulators.

-- 


					    Gilles Chanteperdrix.