[Xenomai-help] timestamping of events in a xenomai task?

[Xenomai-help] timestamping of events in a xenomai task?

[Jens Köhler]

[-- Attachment #1: Type: text/plain, Size: 264 bytes --]

Hello,

I have a computer where time is synchronized by ntp. In a xenomai task I
like to time stamp external events. What is best way to read linux system
time in a Xenomai task?

Does function *int ftime(struct timeb ***tp**);* works?


Thanks and regards,

Jens

[-- Attachment #2: Type: text/html, Size: 404 bytes --]

Re: [Xenomai-help] timestamping of events in a xenomai task?

[Gilles Chanteperdrix]

On 09/26/2011 11:13 AM, Jens Köhler wrote:
> Hello,
> 
> I have a computer where time is synchronized by ntp. In a xenomai task I
> like to time stamp external events. What is best way to read linux system
> time in a Xenomai task?
> 
> Does function *int ftime(struct timeb ***tp**);* works?

ftime documentation says:
This  function is obsolete.  Don't use it.  If the time in seconds suf‐
fices,  time(2)  can  be  used;  gettimeofday(2)  gives   microseconds;
clock_gettime(2) gives nanoseconds but is not as widely available.

In order to solve this particular issue, a new clock was introduced in
Xenomai 2.6.0: CLOCK_HOST_REALTIME to be used with Xenomai posix skin
clock_gettime service. It requires a compatible I-pipe patch, currently
only available for x86 and ARM. Note that CLOCK_HOST_REALTIME can only
be used for timestamping, not for timers.

Xenomai 2.6.0 was not yet released, but you can try 2.6.0-rc3 in the
mean time.

-- 
					    Gilles.