On Thu, Feb 13, 2014 at 2:16 AM, Antoine Jaouen <antoine.jaouen@xxxxxxxxxxxxxx> wrote:
Hello,
I am, Antoine Jaouën, a PhD student under the direction of Laurent Pautet, Etienne Borde and Thomas Robert from the LTCI - Telecom ParisTech.
I would like to join your team in order to integrate my work into your project POK and help your team to improve the project.
I developed a deterministic implementation of ARINC653 inter-partition communications based on the Periodic-Delayed protocol introduced in : Deterministic Implementation of Periodic-Delayed Communications and Experimentation in AADL. Fabien Cadoret, Thomas Robert, Etienne Borde, Laurent Pautet, and Frank Singhoff. ISORC 2013.
In order to start a collaboration, I want to share with you some bugs I found in the current version of POK. The first bug is in the next_activation time of threads after a call of pok_thread_period (which induces a thread to wait until its next period time).
The bug is located in kernel/core/sched.c :
line 206 :thread->next_activation = thread->period + POK_GETTICK();
This way, a thread waits its full period duration after ending its execution. Nevertheless it must wait only the remaining time until its next period time.
Here is the correction : thread->next_activation = thread->next_activation + thread->period;
I also corrected the toolchain. The path of 'ar' was hard-coded in 'misc/mk/rules-partition.mk'.
My last correction was the allocation of 'Partition_Slots' in 'examples/arinc653-queueing/model.aadl', which were too long. I have not checked/corrected all examples but some others have also issues with regard to the dimension of 'Major_Frame', 'Partition_Slots' and 'Period' of threads.
You will find a patch as an attachment of this email, which corrects all those issues.
Best regards,
Antoine Jaouën
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