We have an app that uses a "main" NSManagedObjectContext (MOC) for all 
UI-related work, and has background threads that add and update data via their 
own dedicated MOCs. When they call -save: on their MOC, the "main" MOC gets the 
NSManagedObjectContextDidSaveNotification and calls 
-mergeChangesFromContextDidSaveNotification:.

The problem is, this actually happens on the thread that called -save:, not on 
the main thread. We're seeing occasional crashes, and suspect that it is due to 
this problem. However, I didn't see anything in the docs that said we had to 
call -save: from the main thread, or take any special steps when handling that 
notification.

Did I just overlook something, or should this work safely always? It seems like 
the latter is unlikely, since two threads could be accessing a MOC 
simultaneously.

Thanks,
Rick

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