[Adeos-main] When do I need to add local_irq_disable_hw/local_irq_enable_hw in root domain?

[Adeos-main] When do I need to add local_irq_disable_hw/local_irq_enable_hw in root domain?

[Josh Zhao]

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Hi ,
    When do I need to add  local_irq_disable_hw/local_irq_enable_hw in root
domain?  I think every irq/event should not be disabled in root domain,but
why  i  have seen in some code ?
   thanks!

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Re: [Adeos-main] When do I need to add local_irq_disable_hw/local_irq_enable_hw in root domain?

[Philippe Gerum]

Josh Zhao wrote:
> Hi ,
>     When do I need to add  local_irq_disable_hw/local_irq_enable_hw in
> root domain?  I think every irq/event should not be disabled in root
> domain,but  why  i  have seen in some code ?

Because some serialization still needs to be enforced, even for the root domain,
particularly for code that may have an impact on the pipeline state.

>    thanks!
>  
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Adeos-main mailing list
> Adeos-main@domain.hid
> https://mail.gna.org/listinfo/adeos-main


-- 
Philippe.

Re: [Adeos-main] When do I need to add local_irq_disable_hw/local_irq_enable_hw in root domain?

[Josh Zhao]

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Thanks,Philippe Gerum
     Well, I have another question:
      1.  Why I need take over the  linux syscall ,I think that it is only
for linux domain,so it looks no necessary to take over them?
      2. kernel/exit.c        ipipe_exit_notify(tsk);
    When a process exits, why adeos  has to take  over it ?

 This questions are very simply, but I m a beginner on  adeos.

thanks!


2008/4/1, Philippe Gerum <rpm@xenomai.org>:
>
> Josh Zhao wrote:
> > Hi ,
> >     When do I need to add  local_irq_disable_hw/local_irq_enable_hw in
> > root domain?  I think every irq/event should not be disabled in root
> > domain,but  why  i  have seen in some code ?
>
>
> Because some serialization still needs to be enforced, even for the root
> domain,
> particularly for code that may have an impact on the pipeline state.
>
> >    thanks!
> >
> >
> >
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > Adeos-main mailing list
> > Adeos-main@domain.hid
> > https://mail.gna.org/listinfo/adeos-main
>
>
> --
>
> Philippe.
>

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Re: [Adeos-main] When do I need to add local_irq_disable_hw/local_irq_enable_hw in root domain?

[Gilles Chanteperdrix]

Josh Zhao wrote:
 > Thanks,Philippe Gerum
 >      Well, I have another question:
 >       1.  Why I need take over the  linux syscall ,I think that it is only
 > for linux domain,so it looks no necessary to take over them?

This allows non root domain to use (part of) Linux syscall path. The
fact that Xenomai takes over Linux syscall path is what makes user-space
real-time possible.

 >       2. kernel/exit.c        ipipe_exit_notify(tsk);
 >     When a process exits, why adeos  has to take  over it ?

This allows non root domain to run per-process cleanups. Xenomai uses it
to destroy per-process objects and so gains a little comfort. You no
longer have to take care to intercept process termination and run
process cleanups, Xenomai does it automatically.

-- 


					    Gilles.