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I have read that ConcurrentDictionary only locks when writing, so the reads are lock free.
http://blogs.msdn.com/b/pfxteam/archive/2010/01/08/9945809.aspx
reads on the dictionary are performed in a lock-free manner
But what about visibility, how do they ensure this when the reads are lock free?
The use of the MemoryBarrier ensures that the objects are ‘published’ for other threads. This does not require a lock.