On 07/06/2011 10:38 PM, Jeremy Friesner wrote:
> My first question is: Am I right in suspecting that gettimeofday()
> can occasionally spin/livelock, when called from a Xenomai 2.5.3
> real-time thread? FWIW, it gets called from the real-time thread
> once every 333mS.
Yes, this is a known issue.
>
> And if that is the case, my second question is: Is there an
> alternative "safe" way to call gettimeofday() (or something
> equivalent) so that the real-time thread can find out the current PTP
> system time? Or do I need to re-write my code so that the real-time
> thread never calls gettimeofday()?
>
> Is there a recommended practice for using Xenomai threads in
> conjunction with PTP?
There are several ways out:
- the rtdk library provides a version of gettimeofday which switches to
secondary mode before calling the real gettimeofday. In order to use it,
you have to link your application with:
-Wl,--wrap,gettimeofday -lrtdk
- you can forcibly emit the syscall like the clocktest application does.
--
Gilles.
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