How singlethreaded model is working

Can any one tell me how single threaded model working in Servlet. How it can assure me that no 2 thread working simultaneously in the shared resources.

Read the documentation (http://java.sun.com/j2ee/1.4/docs/api/javax/servlet/SingleThreadModel.html).
Up to one thread is allowed to execute concurrently in a servlet instance. The servlet engine may however create more than one servlet instance to service requests.
Note also that SingleThreadModel is now deprecated. Instead of relying on SingleThreadModel, you should instead be designing shared resources to be thread safe by using synchronized sections, etc.

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