NSMutableArray is thread safe?

Can anybody give me example that NSM开发者_JAVA技巧utableArray is thread safe or not?

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It is not thread safe. See the list of thread safe/unsafe classes here

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According to the Apple docs NSMutableArray is not thread safe.

Mutable objects are generally not thread-safe. To use mutable objects in a threaded application, the application must synchronize access to them using locks. (For more information, see “Atomic Operations”). In general, the collection classes (for example, NSMutableArray, NSMutableDictionary) are not thread-safe when mutations are concerned. That is, if one or more threads are changing the same array, problems can occur. You must lock around spots where reads and writes occur to assure thread safety.

http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Multithreading/ThreadSafetySummary/ThreadSafetySummary.html