Re: pfUpdatable::pf_addUpdate ??!

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Rémi Arnaud (remi++at++remi.engr.sgi.com)
Wed, 6 May 1998 11:08:12 -0700 (PDT)

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Steve Baker wrote:
>
>
>
> I'm seeing this message coming out of Perf2.2 MR, can anyone
> translate it into English for me?
>
> DEBUG pfUpdatable::pf_addUpdate not called from APP process=PID:16364 DBASE ,Updatable=pfGroup
>
> ...sometimes it says 'pfLOD' instead of 'pfGroup'.
>
> What is the function of this 'pf_addUpdate' function - and what might I be
> calling that in turn is calling it?
>
> I am paging data from disk in my DBASE process - and every now and again I'll
> get zillions of these messages.

Every libpf object (pfGroup, pfLOD...) have multiple copies that each correspond of
one of the APP/CULL/DRAW stage of the software pipeline. Performer synchronization
mechanism works using the addUpdate mechanism which is hidden inside pf objects.

This mechanism works only if called from the Application process, no other process
can modify the scene graph without perturbating the synchronization mechanism, and
that can be fatal. This problem was very difficult to track, so 2.2 has this
warning that let you know (in that particular case) that the DBASE process did a
direct modification to a pfGroup node. So it tells you that the mandatory pfBuffer
mechanism was not used in the Dbase process, and that the scene graph may be
corrupted.

I hope this helps.

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