[Xenomai] accessing process' virtual memory areas from driver

[Xenomai] accessing process' virtual memory areas from driver

[Jorge Ramirez Ortiz, HCL Europe]

On a Xenomai multi-threaded application,  I need to access the process list of virtual memory areas in an rtdm driver. 
Since this region is protected by mmap_sem, I am unsure how to perform the access. 
Any guidance will be appreciated.
thanks
Jorge 


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Re: [Xenomai] accessing process' virtual memory areas from driver

[Gilles Chanteperdrix]

On 07/24/2012 09:48 PM, Jorge Ramirez Ortiz, HCL Europe wrote:

> On a Xenomai multi-threaded application,  I need to access the
> process list of virtual memory areas in an rtdm driver. Since this
> region is protected by mmap_sem, I am unsure how to perform the
> access. Any guidance will be appreciated. thanks Jorge


>From real-time domain, you can not do it: the mmap_sem data may not be
in a coherent state, so do the vma list.

>From Linux domain, no problem, just take the mmap_sem.

-- 
                                                                Gilles.