No, that would mean that you tried to mutate a non-mutable dictionary. :-)
 You were getting lucky before in that some dictionary was passed to you
that was typed as NSDictionary, but _happened_ to be of the subclass
NSMutableDictionary.  _That's_ what changed on you.

Be aware that if you send -copy to an NSMutableDictionary, you get a
non-mutable NSDictionary.

-Ken

On Fri, Mar 12, 2010 at 3:23 PM, Paul Sanders <[email protected]>wrote:

> Just a heads-up to say that when I created an NSMutableDictionary on the
> main thread and then tried to mutate it in a subthread, Snow Leopard threw
> an exception ("trying to mutate a non-mutable object", or somesuch).  I was,
> of course, protecting the mutable dictionary against reentrancy problems and
> the same code worked fine on Leopard and Tiger.  I guess Apple think it's
> dangerous to let us play with the sharp toys...
>
> Paul Sanders
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