Re: Whiteboard cacheing

[Alexander Larsson <alexl redhat com>]

On Fri, 2005-04-29 at 12:03 -0400, David Malcolm wrote:
> On Fri, 2005-04-29 at 11:25 +0200, Alexander Larsson wrote:
> > 
> > In fact, since after drawing a stroke the client is guaranteed to
> > request it i think it would make sense to render the initial versions in
> > the addStroke method call to avoid races for in what order to draw
> > thumbnail/full image.
> Were there really races?  I thought I'd made all of the whiteboard
> methods that accessed the cache synchrnoized

The race would be on a larger scale:
Both the drawing client and a displaying client gets told of the change,
and both requests an update. If the displaying client request gets
through first it'll request the thumbnail, which doesn't redraw the full
image, when the drawing clients request for the full image gets through
we then have to redraw the image again.

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 Alexander Larsson                                            Red Hat, Inc 
                   alexl redhat com    alla lysator liu se 
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