Lionel Perrin wrote:
> I got some difficulties to use either rt_alarm_wait or clock_nanosleep.
> It seems i haven't understood what's a "context that can sleep".
>
> First of all, what do we need to use clock_nanosleep ?
> Is it impossible to use this function in the main thread ?
Xenomai clock_nanosleep, nanosleep or rt_alarm_wait services are
reserved to Xenomai real-time threads, and will return an error of EPERM
otherwise.
If you want a non-realtime sleep, you may still access standard services
using __real_nanosleep or __real_clock_nanosleep.
If you want to obtain a Xenomai real-time thread using the posix skin
you have to make it use the SCHED_FIFO policy, either by creating it
with the pthread_create service, specifying non null creation attributes
or by changing the scheduling policy of an existing thread with
the pthread_setschedparam service.
If you want to obtain a Xenomai real-time thread using the native skin,
you may create it with the rt_task_create service or turn an existing
thread into a real-time thread with the rt_task_shadow service.
> (...)
> ret = nanosleep(&tp, &rmtp);
> switch (errno) {
> (...)
errno value is only meaningful if nanosleep returns -1. In particular it
is not garanteed to be zero if nanosleep did not fail.
--
Gilles Chanteperdrix.
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