Re: [Xenomai-core] Question about getting system time

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

Jan Kiszka wrote:
> Just like it seems to be the case for Steve (unless I misunderstood his
> reply), it is very useful for us being able to time-stamp events in RT
> context that need to be correlated with events stamped in non-RT
> (including non-Xenomai) parts or even on other systems: (offline) data
> fusion, logging, tracing. I even bet that this is currently the major
> use case for synchronized clocks, only a smaller part already has the
> need to synchronize timed activities on a common clock source. But there
> is huge potential in the second part once we can provide a stable
> infrastructure.

I already had such issues, and I did not solve them by modifying Xenomai
core.

> Even a "third clock" would have to be delivered for more archs than x86,
> no question. We would basically need a generic but slow syscall variant
> and per-arch syscall-less optimizations (where feasible).

So, you would add a syscall which would becomre useless when you have
implemented synchronized clocks properly? Yet another reason for
avoiding this solution.

-- 
					    Gilles.