On Mar 8, 2012, at 09:09 , Nick Zitzmann wrote: > +defaultManager is not thread-safe IIRC.
It's currently listed as thread-safe: https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Multithreading/ThreadSafetySummary/ThreadSafetySummary.html I believe there was historically some confusion because the safety characteristics changed in 10.5, and the documentation didn't properly reflect the post-10.5 behavior. There were 2 separate safety issues: 1. Is NSFileManager atomically safe? That is, can you safely use a single instance from multiple threads without confusing the instance. 2. Is NSFileManager thread safe? Can you safely use multiple instances from multiple threads without (say) running into a file system deadlock. If #2 wasn't true, you'd have to use instances other than [NSFileManager defaultManger] with extreme care. If #1 wasn't true, you'd have use a different instance in each thread, or implement your own atomic lock. I believe #1 wasn't true pre-10.5, but it was hard to know for sure because most information on the subject didn't properly distinguish between atomicity and thread safety. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com