[Bug 2069] [CBS Scheduler] Memory leak and enqueue problem

bugzilla-daemon at rtems.org bugzilla-daemon at rtems.org
Fri Jul 6 05:38:47 UTC 2012


--- Comment #12 from Andreas Heinig <andreas.heinig at cs.tu-dortmund.de> 2012-07-06 00:38:47 CDT ---
(In reply to comment #11)
> "Extra file for CBS thread context allocation" looks ok to apply to me.
> I still prefer to sit on the "Priority fix - dirty hack !!" patch. The problem
> is that it affects code unrelated to CBS or EDF scheduling. I think we should
> either introduce a scheduler call-out to obtain a thread's priority or find a
> different way to encode the background / periodic task bit.

Another version of the patch could be to explicitly mask out the bit. This is
done e.g. in cpukit/score/src/scheduleredfreleasejob.c:

new_priority = (_Watchdog_Ticks_since_boot + deadline)
                   & ~SCHEDULER_EDF_PRIO_MSB;

This would change my patch in:
-  priority     = the_thread->current_priority;
+  priority     = the_thread->current_priority & ~SCHEDULER_EDF_PRIO_MSB;

o now, everybody knows why there is some bit operation

o If another scheduler needs an extra bit too, it would require editing again

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