what's role of 'extract' of structure Objects_Information's member?

[Gedare Bloom]

See cpukit/score/src/threadqextractwithproxy.c line 53.

On Wed, Sep 5, 2012 at 8:31 PM, Bacon Xu <baconxu at gmail.com> wrote:
> I have studied all of document of RTEMS, and now, I start to read
> source code of RTEMS. When to see the structure Objects_Information,
> I'm very confused about 'extract'. it's a function pointer, there is
> initialized codes in _Objects_Initialize_information under
> multiprocessing situations. But I haven't found any place to use this
> field. What is  role of  the 'extract' ?
>
> --
> BRs
> Bacon
> baconxu at gmail.com    An amateur of RTEMS.
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