Re: [Xenomai-core] Initialization of a nucleus pod

[Philippe Gerum <rpm@xenomai.org>]

Germain Olivier wrote:
> Thank you for your response
> 
> So rootcb isn't the "scheduler task".
> I was thinking it was this task which was determining what thread to run,
> depending of its parameters (priority, periodicity, scheduling mode).
> 
> I go back to the code to understand how it work ...
>

Use the simulator to understand the dynamics of this code: it brings you 
single-stepping of the entire Xenomai core over GDB, at source code level.


> Germain
> 
> 
>>xnthread_init does part of the initialization. The low level part of
>>rootcb (its xnarchtcb_t member) is initialized twice, first by the call
>>to xnarch_init_tcb in xnthread_init, and then overriden by
>>xnarch_init_root_tcb in xnpod_init.
>>
>>For any other thread than root, the thread would be given a stack and
>>entry point by the call to xnarch_init_thread in xnpod_start_thread. But
>>the root thread is Xenomai idle task, a placeholder for whatever task
>>Linux is currenty running. At the time where xnpod_init is called, the
>>root thread is the current context, so already has a stack and is
>>already running.
>>
>>--
>>
>>
>>					    Gilles Chanteperdrix.
>>
> 
> 
> 
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-- 

Philippe.