Semaphore - Task priority queueing not working (Binkowski, Cassio)

Tue Jul 24 21:46:21 UTC 2012

Hello Cassio,

It seems that you have created the semaphore as GLOBAL, and the RTEMS
documentation says:
*The priority inheritance and priority ceiling algorithms are only
supported for local, binary*
*semaphores that use the priority task wait queue blocking discipline.*

Cheers,

Matías

On Tue, Jul 24, 2012 at 2:00 PM, <rtems-users-request at rtems.org> wrote:

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> Today's Topics:
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>    1. Semaphore - Task priority queueing not working (Binkowski, Cassio)
>    2. Re: Power management (Sebastian Huber)
>    3. Can rtems4.11-gcc compile rtems-4.10? (??)
>    4. Re: Can rtems4.11-gcc compile rtems-4.10? (Pierre Ficheux)
>    5. Re: Can rtems4.11-gcc compile rtems-4.10? (Ralf Corsepius)
>    6. Re: Can rtems4.11-gcc compile rtems-4.10? (Ralf Corsepius)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 23 Jul 2012 23:57:31 -0300
> From: "Binkowski, Cassio" <cassioiks at gmail.com>
> To: rtems-users at rtems.org
> Subject: Semaphore - Task priority queueing not working
> Message-ID:
>         <CAG93Rg4FJdoh_NdRGnRJvwJJyvd7jnYJUXoqw9fCDGpMTb=
> ppA at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hello
>
> I am creating a Semaphore where Tasks are queued by priority, and yet a
> Task with lower priority stands in front of a higher priority task.
>
> Here are the steps I'm following:
>
> 1) Create a Semaphore;
> 2) Task 1, with priority 1, obtains the Semaphore;
> 3) Task 2, with priority 3, tries to obtain the Semaphore with "wait for
> ever condition";
> 4) Task 3, with priority 2, tries to obtain the Semaphore with "wait for
> ever condition";
> 5) Task 1 releases the Semaphore;
> 6) Task 2 obtains the Semaphore. *---> This is where Task 3 should obtains
> the **Semaphore, because of the Priority.*
>
> This is how I'm creating the Semaphore:
>
> status = rtems_semaphore_create(
> rtems_build_name('S','M','P','R'),
>  1,
> RTEMS_PRIORITY | RTEMS_BINARY_SEMAPHORE | RTEMS_GLOBAL,
> 0,
>  &semaphoreId
> );
>
>
> What am I doing wrong?
>
> Best regards
> Cassio
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> ------------------------------
>
> Message: 2
> Date: Tue, 24 Jul 2012 09:52:29 +0200
> From: Sebastian Huber <sebastian.huber at embedded-brains.de>
> To: RTEMS <rtems-users at rtems.org>
> Subject: Re: Power management
> Message-ID: <500E543D.1020409 at embedded-brains.de>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hello,
>
> everything that the RTEMS core system offers in terms of power management
> is an
> application specific idle task.  For good power management you need a
> device
> driver model which supports suspend and resume operations.   The standard
> RTEMS
> device drivers have no such capability.  Thus power management is up to the
> application in the RTEMS world.  It is possible to use the FreeBSD driver
> model
> on RTEMS for example which has support for suspend and resume operations,
> but
> every driver of your hardware has to be written with power management in
> mind.
>
> --
> Sebastian Huber, embedded brains GmbH
>
> Address : Obere Lagerstr. 30, D-82178 Puchheim, Germany
> Phone   : +49 89 18 90 80 79-6
> Fax     : +49 89 18 90 80 79-9
> E-Mail  : sebastian.huber at embedded-brains.de
> PGP     : Public key available on request.
>
> Diese Nachricht ist keine gesch?ftliche Mitteilung im Sinne des EHUG.
>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 25 Jul 2012 00:08:01 +0800
> From: ?? <shurphey at gmail.com>
> To: rtems-users at rtems.org
> Subject: Can rtems4.11-gcc compile rtems-4.10?
> Message-ID: <500EC861.3010809 at gmail.com>
> Content-Type: text/plain; charset=GB2312
>
> Hi all,
> Someone can tell me how to use rtems4.11-gcc to compile rtems-4.10? Now,
> i have rtems4.11 toolchains and rtems4.10 source code,
> i want to use the toolchain to compile the code, i configured the
> target=xxxx-rtems4.11, but fail. Thanks!
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 24 Jul 2012 18:21:56 +0200
> From: Pierre Ficheux <pierre.ficheux at openwide.fr>
> To: rtems-users at rtems.org
> Subject: Re: Can rtems4.11-gcc compile rtems-4.10?
> Message-ID: <500ECBA4.5040903 at openwide.fr>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> Le 24/07/2012 18:08, ?? a ?crit :
> > Hi all,
> > Someone can tell me how to use rtems4.11-gcc to compile rtems-4.10? Now,
> > i have rtems4.11 toolchains and rtems4.10 source code,
> > i want to use the toolchain to compile the code, i configured the
> > target=xxxx-rtems4.11, but fail. Thanks!
> >
>
> What's the use of it? It's not so difficult/long to build a 4.10 compiler.
>
> http://www.rtems.org/wiki/index.php/Building_Tools
>
> regards
>
> --
> Pierre FICHEUX  -/- CTO OWI, France -\- pierre.ficheux at openwide.fr
>                                           http://ingenierie.openwide.fr
>                                           http://www.ficheux.org
> I would love to change the world, but they won't give me the source code
>
>
>
>
> ------------------------------
>
> Message: 5
> Date: Tue, 24 Jul 2012 18:38:22 +0200
> From: Ralf Corsepius <ralf.corsepius at rtems.org>
> To: rtems-users at rtems.org
> Subject: Re: Can rtems4.11-gcc compile rtems-4.10?
> Message-ID: <500ECF7E.4020308 at rtems.org>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> On 07/24/2012 06:08 PM, ?? wrote:
> > Hi all,
> > Someone can tell me how to use rtems4.11-gcc to compile rtems-4.10?
> You can't.
>
>   Both are different generations of toolchains with different setups and
> different features.
>
> Ralf
>
>
>
> ------------------------------
>
> Message: 6
> Date: Tue, 24 Jul 2012 18:44:28 +0200
> From: Ralf Corsepius <ralf.corsepius at rtems.org>
> To: rtems-users at rtems.org
> Subject: Re: Can rtems4.11-gcc compile rtems-4.10?
> Message-ID: <500ED0EC.8040901 at rtems.org>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> On 07/24/2012 06:21 PM, Pierre Ficheux wrote:
> > Le 24/07/2012 18:08, ?? a ?crit :
> >> Hi all,
> >> Someone can tell me how to use rtems4.11-gcc to compile rtems-4.10? Now,
> >> i have rtems4.11 toolchains and rtems4.10 source code,
> >> i want to use the toolchain to compile the code, i configured the
> >> target=xxxx-rtems4.11, but fail. Thanks!
> >>
> >
> > What's the use of it? It's not so difficult/long to build a 4.10
> compiler.
> >
> > http://www.rtems.org/wiki/index.php/Building_Tools
>
> This is just a rough and coarse outline, describing the basic working
> principle, it lacks many details and doesn't reflect the fact building
> the toolchains is a rolling and evolving process. I can't recommend
> anybody (esp. new-comers) following it.
>
> That said, if not very being careful, it's pretty much guaranteed to
> kill an installation. It's one of the reasons why I am supplying binary
> packages and why OpenSource OS vendors are supplyling binary packages ;)
>
> Ralf
>
>
>
> ------------------------------
>
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> End of rtems-users Digest, Vol 70, Issue 29
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