What version of RTL and what processor has the time gain?
clock_gettime is better than do_gettime since it is
the POSIX call and will work on RTbsd as well as RTLinux.
We should just fix the gettime if that's not correct.
> Thomas Folkers wrote:
> >
> > Victor,
> > How come I can't get the time of day from the kernel? If I use
> > do_gettimeofday(), eventually the system will hang. It may not happen
> > right away, but it will hang. I'm trying to time external events and
> > record the exact time an interrupt comes in and the only way to compare
> > that time to other events and to other systems is to have the exact
> > system time. The clock_gettime() routine returns something close to
> > the real system clock time, but then proceeds to gain time at the rate of
> > 35,000 nsecs/sec. That's probably due to a miss calibration in the cpu HZ
> > value. I have looked over the rtl_time.c file and can see where you 'sync'
> > the CLOCK_REALTIME to the results of a do_gettimeofday() call, but then
> > there doesn't seem to be any other 'tweeks' to the time to keep it in
> > sync. So, while the clock_gettime() produces a nice monotonic clock, it
> > bear little resemblance to actual time.
> > So, how do I get the time of day from the kernel?
> >
> > Thanks for you help,
> > Tom
> >
> > --
> >
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> ===================================================
> Karim Yaghmour
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> Embedded and Real-Time Linux Expert
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