Hi All,

   our app has since long time dealt with multiple threads and
QCRenderer, and we've worked around the issues that this implied (see
Technical Q&A 1538 -
http://developer.apple.com/mac/library/qa/qa2008/qa1538.html ).

Now, we're intrigued by the power and simplicity that Grand Central
Dispatch would bring to our code: still, it's my understanding that we
surrender the tight control over which-thread-does-what, that's vital
to avoid the #1538 issues.

Admittedly, I haven't explored GCD enough to know if there are ways to
work the way we need: has anyone tried this, and how does that come
out? Or, is the issue solved in Snow Leopard?

Regards

Paolo Manna
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