[PATCH 3/3] score: Task get/set affinity

Joel Sherrill Joel.Sherrill at OARcorp.com
Wed Apr 9 11:17:34 UTC 2014

On Apr 9, 2014 1:06 AM, Sebastian Huber <sebastian.huber at embedded-brains.de> wrote:
> On 2014-04-08 17:09, Jennifer Averett wrote:
> > I thought the consensus was that non-smp systems would not
> > support affinity methods.
> I don't remember a discussion about this.
> I think it makes it easier for application developers if the don't have to
> plaster their code with #ifdef RTEMS_SMP.  You should also be able to write
> libraries that work with SMP and non-SMP configurations.  For this we have to
> provide the same ABI.  This should be the long term goal.

Ironically this is exactly what we have not done with disable preemption and task variables.

> I propose to add a new requirement:
> The non-SMP and SMP RTEMS Classic API should be ABI compatible.
> http://www.rtems.org/wiki/index.php?title=SMP#Requirements

So you propose to defer compile errors for task variables to run time?

> On Linux you can use the thread affinity functions also on non-SMP systems.

For this I do not mind but we did discuss this at the beginning of the implementation.

The short circuit logic for non-smp should be in the api level code and the score should have NO code for affinity.

Otherwise you impact the minimum profile and this is 100% unacceptable.

> --
> Sebastian Huber, embedded brains GmbH
> Address : Dornierstr. 4, D-82178 Puchheim, Germany
> Phone   : +49 89 189 47 41-16
> Fax     : +49 89 189 47 41-09
> E-Mail  : sebastian.huber at embedded-brains.de
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> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
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