[Bug 4487] SMP: C&C and Red Alert stop redrawing at random times

http://bugs.winehq.org/show_bug.cgi?id=4487

Toni Spets  changed:

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--- Comment #28 from Toni Spets  2010-11-05 10:53:43 CDT ---
During my work on cnc-ddraw (https://github.com/hifi/cnc-ddraw) I discovered
that this issue was completely avoided my my minimal ddraw implementation.

It seems that this is somehow related to ddraw async API and thread
synchronization. Sometimes when I changed the synchronizing style I got a
lockup almost instantly (like in Wine ddraw).

Currently I think my code avoids this problem. Both games can run without using
schedtool.

Its worth noting this is also an issue on real Windows with multiple cores. The
game occasionally freezes without setting one core affinity and/or setting
win95/win98 compatibility mode (which probably also sets one core affinity).

So, this is most probably related to Wine's current ddraw implementation and
its async API not being thread safe.

cnc-ddraw is still a work-in-progress.