Re: [Xenomai-help] App with pthreads using rt_task_shadow locks up

[Jochen Behnke <JK.Behnke@domain.hid>]

Hello,

after hours of searching, I have finally found the problem. 
It was a bug in my "SimpleRPC" library. The thread function, responsible for the "lockup", mainly constists of an endless loop ( while(pObj->nRun) ) that polls a request queue. This was not a problem as long as this thread was a standard pthread. Turning this thread into a real-time task by adding a call to rt_task_shadow at the beginning of the thread function (before the while loop) resulted in a frozen linux system.

I used to work with the following system
Gentoo Linux
Linux Kernel 2.6.17 (IPIPE 1.4)
Xenomai 2.2.3

Now that I know, that upgrading to Xenomai 2.3.0 is not a problem, I plan to upgrade to the 2.3.x branch.


Regards

Jochen


> 
> Hello Gilles,
> 
> > Jochen Behnke wrote:
> > > Hello Gilles,
> > > 
> > > thanks for your response. 
> > > At the moment I try to cut down my application to the minimum.
> > > I also will install the latest version of the xenomai 2.2.x branch (2.2.5) and check whether I can reproduce the fault.  As I noticed that some functions have been changed (rt_mutex_lock/unlock no longer exist in Xenomai 2.3.x, they obviously have been renamed for some reason) I would rather stick to the 2.2.x branch. Is that reasonable in your opinion ?
> > > Will the 2.2.x branch be maintained in the future ?
> > > 
> > > Thanks again.
> > > 
> > > Jochen
> > 
> > Please do not forget to CC the list.
> I'm sorry. I just used the wrong reply button.
> 
> > 
> > rt_mutex_lock/rt_mutex_unlock were renamed
> > rt_mutex_acquire/rt_mutex_release to avoid a conflict, as documented in
> > API.CHANGES
> I will have a look at this.
> 
> > 
> > Please try with Xenomai 2.3.0, or better with trunk. The aim of this
> > check is for us to avoid chasing bugs that were already solved. For
> > example if you are using fork() in your application, only I-pipe patches
> > in the trunk will solve your problem.
> At the moment I don't use fork() but I can try using 2.3.x.
> I hope that I don't have to change too much code on my side.
> 
> As soon as I have results, I'll post them here.
> 
> Jochen
> 
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