Difference in usage and implementation of ManualResetEvent(Slim), Semaphore(Slim) and ReaderWriterLock(Slim)

Created Jul 20, 2011 Edited Jul 20, 2011

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With .net 4.0 several new classes have been added relating to threading: ManualResetEventSlim, SemaphoreSlim and ReaderWriterLockSlim.

What is the difference between the Slim versions and the older classes, and when should I use one over the other?