I know NSCache is thread safe, however I can't find out any document mentioned that NSURLCache is thread safe. Anyone has certain answer please let me know.
Normally I'd take @bbum's stance on this, but in the case of
NSURLConnection is thread safe, in the sense that a given instance can be scheduled on a thread of your choosing (but don't try to schedule a single instance on multiple threads!)
By default, connections all interact with
+[NSURLCache sharedCache]. Logically, this means either
NSURLCache is itself thread safe, or offers a locking mechanism which clients can explicitly call themselves. Since the latter doesn't exist, I deduce
NSURLCache is thread safe.
Would still like this to be documented officially, mind!