About the rate_monotonic_manager

[Kuan Hsun Chen]

Hello Gedare,

Yes, I notice that in the other test suites.

About the question I asked before, I found that I made a simplest but
critical mistake on the execution.
Therefore, the preemptive behaviour and semaphore both faulted due to the
wrong execution time.

Best,
Kuan-Hsun

2015-07-13 17:12 GMT+02:00 Gedare Bloom <gedare at rtems.org>:

> Kuan-Hsun,
>
> You must assign the priorities of tasks similarly to their periods
> where smaller periods require higher priority. See
> testsuites/sptests/sp20/task1.c for an example.
>
> -Gedare
>
> On Wed, Jul 1, 2015 at 4:21 PM, Kuan Hsun Chen
> <kuan-hsun.chen at tu-dortmund.de> wrote:
> > Hello everyone,
> >
> > Does Rate Monotonic Manager update the priorities of tasks and suspend
> the
> > lower priority task accordingly?
> >
> > In C_user manual, I cannot find any description about the priority
> > management in Chapter 10.
> > Therefore, I assume RM has the scheduler to handle the priority
> according to
> > the registered tasks periods as the common design in the most of
> real-time
> > literature.
> >
> > After using Rate Monotonic Manager APIs, indeed, I can have the periodic
> > task executions.
> > Moreover, I also have tried on the semaphore to reappear the priority
> > inversion case.
> > However, I cannot observe the preemption scenario by using Rate Monotonic
> > Manager, if all the initial priorities in rtems_task_create() are set to
> 1.
> > Even if I set up the priorities of tasks manually, it seems to me that
> Rate
> > Monotonic Manager doesn't really suspend the task properly.
> >
> > I have checked that the task attribute and task mode allow the
> preemption.
> > Instead of the example_v2/triple period case (one task with RM), I cannot
> > find any example including multitasking with RM scheduling.
> >
> > Do you have the same issue or any useful reference?
> > Probably I misunderstand the meaning of APIs usage...
> >
> > Many thanks,
> > Kuan-Hsun
> >
> > --
> > M.Sc. Kuan-Hsun Chen
> >
> > TU Dortmund
> > Department of Computer Science 12
> > Design Automation of Embedded Systems
> > Otto-Hahn-Strasse 16, Room 102
> >
> > 44227 Dortmund
> > Germany
> >
> > Phone:  +49 231 755 6124
> > Mail:   kuan-hsun.chen at tu-dortmund.de
> >
> > _______________________________________________
> > users mailing list
> > users at rtems.org
> > http://lists.rtems.org/mailman/listinfo/users
>



-- 
M.Sc. Kuan-Hsun Chen

TU Dortmund
Department of Computer Science 12
Design Automation of Embedded Systems
Otto-Hahn-Strasse 16, Room 102

44227 Dortmund
Germany

Phone:  *+49 231 755 6124*
Mail:   kuan-hsun.chen at tu-dortmund.de <kuan-hsun.chen at tu-dortmund.de>
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