[Xenomai-help] [ARM_MV 88F6290] Task limit, msg receive error

[Xenomai-help] [ARM_MV 88F6290] Task limit, msg receive error

[Didenko Sergey]

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Dear Experts

we are facing 2 problems now:

1) in our test application (very simple one) we can create maximum 50 tasks,
next task is failed to create with error *12*
*- Is there any task number limit?*
*- what does 12 mean?*

2) in our project (originally developed for VxWorks), msgQReceive
function returns
-1 and sets errno to 4
*We think that it might be related to XNBREAK thread's flag.*
Current settings are:
CONFIG_XENO_OPT_SYS_HEAPSZ=256
CONFIG_XENO_OPT_SYS_STACKPOOLSZ=128
- we did verify that total stack size of created VxWorks's tasks is about 60
KB
- we did verify that message queue's ID and task's ID were valid.

*- any idea why function msgQReceive fails ?*

Sergey

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Re: [Xenomai-help] [ARM_MV 88F6290] Task limit, msg receive error

[Gilles Chanteperdrix]

Didenko Sergey wrote:
> Dear Experts

Hi, you do not need to flatter us to get answers :-)

> 
> we are facing 2 problems now:
> 
> 1) in our test application (very simple one) we can create maximum 50
> tasks, next task is failed to create with error *12*
> *- Is there any task number limit?*
> *- what does 12 mean?*

Please read the TROUBLESHOOTING guide which comes with Xenomai, for the
question about the task number limit.

For the error codes, see:
http://www.xenomai.org/index.php/Resolving_Error_Codes

> 
> 2) in our project (originally developed for VxWorks), msgQReceive
> function returns -1 and sets errno to 4
> *We think that it might be related to XNBREAK thread's flag.*

Yes, error 4 is EINTR, it means that msgQReceive was interrupted by a
signal. We can only tell you whether this is normal if you tell us in
exactly what conditions you get this error (a test case reduced to the
minimum would be welcome).

-- 
                                          Gilles

Re: [Xenomai-help] [ARM_MV 88F6290] Task limit, msg receive error

[Sergey Didenko]

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2009/11/4 Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>

> Didenko Sergey wrote:
> > Dear Experts
>
> Hi, you do not need to flatter us to get answers :-)
>

Then, who are you if not the experts in Xenomai?
Do not be so modest ;-)


> >
> > we are facing 2 problems now:
> >
> > 1) in our test application (very simple one) we can create maximum 50
> > tasks, next task is failed to create with error *12*
> > *- Is there any task number limit?*
> > *- what does 12 mean?*
>
> Please read the TROUBLESHOOTING guide which comes with Xenomai, for the
> question about the task number limit.
>

So, to solve that problem we did try, as guide says: "A work-around consists
of setting a
lower user-limit for initial stack allocation, like calling "ulimit
-s <initial-size-in-kbytes>" in your parent shell before running
your application", but it did not help at all.

We were able to increase the number of created tasks by increasing the value
of CONFIG_XENO_OPT_SYS_HEAPSZ and CONFIG_XENO_OPT_REGESTRY_NRSLOTS in
configuration for kernel.
For instance, in our test application, finally, we were able to create up to
500 tasks (stack is 10 KB) when options were like
CONFIG_XENO_OPT_SYS_HEAPSZ = 4096
CONFIG_XENO_OPT_REGESTRY_NRSLOTS = 1024


> For the error codes, see:
> http://www.xenomai.org/index.php/Resolving_Error_Codes
>
> >
> > 2) in our project (originally developed for VxWorks), msgQReceive
> > function returns -1 and sets errno to 4
> > *We think that it might be related to XNBREAK thread's flag.*
>
> Yes, error 4 is EINTR, it means that msgQReceive was interrupted by a
> signal. We can only tell you whether this is normal if you tell us in
> exactly what conditions you get this error (a test case reduced to the
> minimum would be welcome).
>
> It was our application's problem, now it is solved.

Sergey

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