JSC-ER7 (hadi.m.tjandrasa1++at++jsc.nasa.gov)
Thu, 30 Oct 1997 14:07:15 -0600
Suppose I have an APP as follows:
while ( RT_run )
{
........
pfSynch();
...........
pfFrame();
}
1) What is the role of pfFrame() called by the APP in scheduling of the
CULL and DRAW processes (assuming they are on separate CPUs)?
2) Does pfFrame triggers the CULL and DRAW to wake up and run on
the next vertical retrace? or the CULL runs immediately and the DRAW
will run on the next vertical retrace? or else ........?
Thanks in advance for any responses,
Hadi
> ----------
> From: src++at++rose.engr.sgi.com[SMTP:src++at++rose.engr.sgi.com]
> Sent: Wednesday, October 29, 1997 9:01 PM
> To: Jean-Luc Dery; remi++at++remi.engr.sgi.com
> Cc: jan++at++archimedes.vislab.navy.mil;
> Subject: Re: Draw Lockup (was Performer Woes)
>
(..............................................)
> when swapbuffers is called and APP will get to run. App goes to
> sleep in pfSync() to the next vertical retrace and will let draw run.
> Also, App and draw are
> woken by the kernel on vertical retrace interupt and do not use a
> semaphore
> to syncrhonize to the graphics pipeline.
> A semaphore is used if you are of pfPhase FREE_RUN however.
>
(.......................................)
> src.
>
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> src++at++sgi.com (650) 933 - 1002 FAX: (650) 965 - 2658 MS 8U-590
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