Re: [Xenomai-core] [0/9] Posix skin user-space mutexes

[Jan Kiszka <jan.kiszka@domain.hid>]

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Gilles Chanteperdrix wrote:
> Hi,
> 
> the patch series to come for review adds support for user-space mutexes to the
> posix skin. Since I wanted this support to be available on my AT91RM9200, the
> patch series start with patches which are mainly for the ARM architecture, to
> end with reimplementation of the kernel-space and user-space mutex services for
> the posix skin.

Cool stuff!

> 
> Some patches brought some questions when making them, questions which will be
> discussed in the mail accompanying the patch.
> 
> Since I do not use quilt, some patches will inevitably mix several
> modifications, especially the patch to ksrc/skins/posix/syscall.c. I promise,
> next time I will use quilt.
> 
> The result has only be tested in the fast (no syscall) case, to evaluate its
> performance, I will start tests trying to cover the syscall case now, and keep
> you informed.

Central question (IMHO): Do you ensure that the kernel-side atomic op on
 the mutex state can _never_ raise an exception? Or do you have some
atomic mechanism that can handle faults?

Jan


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