Ah. In my original email I didn't explain *why* it is that "ideally I would
like to make the copy on a thread other than the main thread". The algorithm is
doing real-time video processing, and I very much want to avoid holding up
anything in that code path by synchronizing with the main queue. Past
experience has shown that that does lead to glitches I am keen to avoid. So,
while I'm a big fan of such constructions, I'm deliberately trying to avoid
that here.
Serializing access to MyParameters will work, it's just a shame that there
isn't such a tidy way of achieving that...
On 3 Sep 2013, at 14:18, Robert Vojta wrote:
> Then this should be enough ...
>
> - (MyParameters *)copyParameters {
> __block MyParameters *parameters;
> dispatch_sync( dispatch_get_main_queue(), ^{
> parameters = [myObjectHoldingParameters.parameters copy];
> });
> return parameters;
> }
>
> ... if all your parameters object properties are set on the main thread only.
>
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