> So my potential solution for this is:
>
> NSSpellChecker *checker = [NSSpellChecker sharedSpellChecker];
> __block NSRange range = NSMakeRange(0, 0);
> while (range.location < [aString length]) {
>
> dispatch_sync(dispatch_get_main_queue(), ^{
> range = [checker checkSpellingOfString:aString
> startingAt:range.location];
> });
>
> // update range
> }
>
> Where this piece of code will run on multiple threads.
>
> Does this look like a reasonable approach to ensuring thread safety?
In addition to the potential for deadlocking that Mike warned about, it's
probably best to be paranoid about +sharedSpellChecker. Hopefully that method
uses a thread-safe singleton allocation (eg: via dispatch_once), but you never
know. I'd move that method call to the main thread too.
However, by using this approach you're not really doing the spell checking work
on a background thread. The work is going to be done synchronously on the main
thread, blocking your GUI (and whatever else). Maybe you should investigate
using -requestCheckingOfString:etc: instead.
~Martin
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