On 2014-06-03 16:14, Gedare Bloom wrote:
On Tue, Jun 3, 2014 at 6:55 AM, Sebastian Huber
<sebastian.hu...@embedded-brains.de> wrote:
>
>I think the bigger problem is that the priority inheritance affects only one
>level, see new test sptests/spsem03.
>
>
Is there a bug PR associated with this test? The behavior under test
looks like a bug to me.
I don't know how old the priority inheritance implementation is in RTEMS, but I
guess it is very old. So this is probably not a bug, its a feature.
With the simple resource count base implementation I think it is impossible to
recursively walk though the resource dependency tree. You would have to use
object specific information (for example CORE_mutex_Control::holder) which is
difficult to access from object agnostic routines.
I want to address these issues with the Resource Handler for the MrsP
semaphores. See diagram here:
http://www.rtems.org/onlinedocs/doxygen/cpukit/html/group__ScoreResource.html
Lets suppose all the resources r0 up to r15 are MrsP semaphores, then the owner
n0 of the resource tree can execute using (= scheduler instance + priority) all
the n1 up to n15 nodes (= threads waiting for resource access).
--
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.hu...@embedded-brains.de
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Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
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