[PATCH] score: Remove PRIORITY_PSEUDO_ISR thread priority
sebastian.huber at embedded-brains.de
Fri Jul 22 12:35:47 UTC 2022
On 21.07.22 16:20, Joel Sherrill wrote:
> On Thu, Jul 21, 2022 at 12:53 AM Sebastian Huber
> <sebastian.huber at embedded-brains.de
> <mailto:sebastian.huber at embedded-brains.de>> wrote:
> Hello Gedare and Joel,
> On 15.07.22 10:43, Sebastian Huber wrote:
> > The uniprocessor schedulers had some special case logic for the
> > PRIORITY_PSEUDO_ISR priority. Tasks with a priority of
> > were allowed to preempt a not preemptible task. If other higher
> priority task
> > are made ready while a PRIORITY_PSEUDO_ISR task preempts a not
> > task, then the other tasks run before the not preemptible task.
> This made the
> > RTEMS_NO_PREEMPT mode ineffective.
> > Remove the PRIORITY_PSEUDO_ISR special case logic. This
> simplifies the
> > uniprocessor schedulers. Move the uniprocessor-specific
> scheduler support to
> > the new header file <rtems/score/scheduleruniimpl.h>.
> > Close #2365.
> I'm guessing that PRIORITY_PSEUDO_ISR wasn't used outside RTEMS itself
> and likely only historically for the Timer Server Thread. The protection
> for that
> thread was reworked as part of the SMP efforts. If it is used outside
> that would be a user facing breakage and should be documented.
> If you think all the use cases of PRIORITY_PSEUDO_ISR are accounted for,
> I'm ok with removing it.
The pseudo-interrupt priority is mentioned in a glossary entry:
A simple approach to extend the priority inheritance protocol for
clustered scheduling is priority boosting. In case a mutex is
owned by a
task of another cluster, then the priority of the owner task is
an artificially high priority, the pseudo-interrupt priority.
This entry was added for the clustered scheduling documentation and
needs to be changed.
I found no reference to the no-preempt break of the pseudo-interrupt
priority in the documentation. I doubt that there is an application
which relies on this extraordinary feature.
embedded brains GmbH
Herr Sebastian HUBER
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