[Bug 11674] Dual-core unsupported in WoW and SC2

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=11674

--- Comment #145 from Aigars Mahinovs <aigarius at gmail.com> 2011-11-05 05:27:45 CDT ---
(In reply to comment #144)
> (In reply to comment #143)
> > I would have grave suspicions about timing and synchronization errors as the
> > draw functions return much sooner that programs expect them to and also return
> > before anything is actually drawn...
> 
> I don't quite agree with this.

I see. After looking at that. I does look like you are right. 

In such case the biggest problem is passing data from primary thread to a
rendering thread in a way that they can be on different processors or cores and
not spend too much time on the synchronisation between processors. If both CPU
would need to get the same lock to read or write data to a common location,
then they would spend so much time waiting for the lock and flushing their CPU
caches that any processing off-loading benefit would be easily destroyed by
that.

And at the same time all this fancy lockless IPC mechansm needs to not hold on
to the data for too long, so that the flushes, finishes and page swaps are not
too delayed.

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