[Xenomai-help] T_JOINABLE flag and task creation in userspace

[Xenomai-help] T_JOINABLE flag and task creation in userspace

[Stefan Eletzhofer]

Hello,
I've just tried to create a task in user space with the T_JOINABLE  
flag set,
as I wanted to rt_task_join() to that thread later on.

Unfortunately, as soon as I set that flag, the task does'nt get started
at all (i.e. its task body is not reached). Is that a known BUG/ 
limitation or am I missing
something? The same program works if I pass 0 instead of T_JOINABLE  
(of course the
rt_task_jolin() fails to join, then, using pause() in that case ;)

I'm using Xenomai 2.1 on a custom PPC board running a 2.4.25 kernel.  
The latency tests
look OKish to me.

Thanks,
Stefan E.

Re: [Xenomai-help] T_JOINABLE flag and task creation in userspace

[Philippe Gerum]

Stefan Eletzhofer wrote:
> Hello,
> I've just tried to create a task in user space with the T_JOINABLE  flag 
> set,
> as I wanted to rt_task_join() to that thread later on.
> 
> Unfortunately, as soon as I set that flag, the task does'nt get started
> at all (i.e. its task body is not reached). Is that a known BUG/ 
> limitation or am I missing
> something? The same program works if I pass 0 instead of T_JOINABLE  (of 
> course the
> rt_task_jolin() fails to join, then, using pause() in that case ;)
> 

Any error code returned by rt_task_create()/rt_task_start()?

> I'm using Xenomai 2.1 on a custom PPC board running a 2.4.25 kernel.  
> The latency tests
> look OKish to me.
> 
> Thanks,
> Stefan E.
> 
> _______________________________________________
> Xenomai-help mailing list
> Xenomai-help@domain.hid
> https://mail.gna.org/listinfo/xenomai-help
> 


-- 

Philippe.

Re: [Xenomai-help] T_JOINABLE flag and task creation in userspace

[Philippe Gerum]

Stefan Eletzhofer wrote:
> Hello,
> I've just tried to create a task in user space with the T_JOINABLE  flag 
> set,
> as I wanted to rt_task_join() to that thread later on.
> 
> Unfortunately, as soon as I set that flag, the task does'nt get started
> at all (i.e. its task body is not reached). Is that a known BUG/ 
> limitation or am I missing
> something? The same program works if I pass 0 instead of T_JOINABLE  (of 
> course the
> rt_task_jolin() fails to join, then, using pause() in that case ;)
> 
> I'm using Xenomai 2.1 on a custom PPC board running a 2.4.25 kernel.  
> The latency tests
> look OKish to me.
> 

A conflict has been detected between the T_JOINABLE bit and the CPU 
affinity bits for the native skin, which caused rt_task_start() to fail 
silently. Fixed in the SVN repository for both the stable and dev 
branches (commits #1062 and #1063).

-- 

Philippe.