About scheduling mechanism rtems task

[박시형]

Thanks a lot! And I will read that link.

And I'm sorry I didn't define cleanly about some words.

Duration is time slice for task. (you are right,  "execute for x amount of
time")
As you said period, I want to say that.

Also I will search example code in rtems.git/ and if I write my code I will
post.

Thanks!.
Sean.


2015-12-01 8:04 GMT+09:00 Gedare Bloom <gedare at rtems.org>:

> On Mon, Nov 30, 2015 at 1:14 PM, 박시형 <inputsh at gmail.com> wrote:
> > Hello?
> > I'm the beginner of RTEMS and C language.
> >
> > I'm trying to make rtems task to running given duration(execution time)
> and
> > period.
> > I mean, I want to running like followings.
> > 'task 1'  duration 10 ms and period is 10 ms.
> > 'task 2'  duration 15 ms and period is 20 ms.
> >
> Period usually means how often the task executes, so a period of 10ms
> means that task should execute every 10ms. If task 1 really takes 10ms
> every 10ms, then there is no other time for task2? Or do you want the
> period to be duration+10ms for  task1?
>
> Can you define what you mean by duration and period?
>
> You might like to read
>
> https://docs.rtems.org/doc-current/share/rtems/html/c_user/Rate-Monotonic-Manager.html#Rate-Monotonic-Manager
> if you have a real-time periodic application you need to satisfy.
>
> > So, when I made tasks I give RTEMS_NO_PREEMPT | RTEMS_TIMESLICE for tasks
> > mode.
> > But in this case, I can't give each time slice to each task.
> >
> > Therefore I was try RTEMS timer for duration and rtems_task_wake_after
> for
> > period.
> > I think timer triggered and timer handler called rtems_task_wake_after
> > function then I can solve that problem. But it wasn't work.
> >
> Maybe you can post your code. I don't entirely understand what you are
> trying to accomplish. You can 'grep' or search through the
> rtems.git/testsuites for lots of examples of using the various rtems_
> functions.
>
> I don't think there is any function that would let you say "execute
> for x amount of time" if that is what you mean by duration.
>
> Gedare
>
> > How can i fix this thing.. Which method can i use for duration and
> period.
> > regards.
> >
> >
> >
> >
> >
> > _______________________________________________
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> > users at rtems.org
> > http://lists.rtems.org/mailman/listinfo/users
>
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