On 03/13/2012 07:06 PM, Herrera-Bendezu, Luis wrote:
> Hello,
>
> Xenomai version 2.4.10, Linux version 2.6.30.3, CPU PPC.
>
> I am trying to work around an issue where the Linux and Xenomai realtime
> clocks
> drifts when Linux clock is updated by NTP. It was suggested in the mail
> exchange:
> http://www.mail-archive.com/xenomai-core@gna.org/msg07646.html
>
> to use clock_gettime()/clock_settime() to keep both clocks in sync.
>
> However, calling linux clock_gettime() from a Xenomai thread is causing
> system to
> freeze after a few minutes as shown in the following test program where the
> interval
> to re-sync clocks is small, 50 msec, to force error faster:
Yes, this is a known issue too. You can only call __real_clock_gettime
when in secondary mode. So, preferably from a thread created with
__real_pthread_create.
Any chance of updating xenomai? Xenomai 2.6 allows accessing a clock
synchronized with Linux clock from xenomai threads, without even
emitting a system call depending on the architecture.
--
Gilles.
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