Description about wait() notify() notifyAll() stop() suspend() and resume(),interprocess comminucation in java to avoid polling..
The use of the implicit monitors in Java objects is powerful, but you can achieve a more subtle level of control through inter-process communication. As you will see, this is especially easy in Java. Multithreading replaces event loop programming by dividing your tasks into discrete and logical units. Threads also provide a secondary benefit: they do away with polling. Polling is usually implemented by a loop that is used to check some condition repeatedly. Once the condition is true, appropriate action is taken. This wastes CPU time. For example, consider the classic queuing problem, where one thread is producing some data and another is consuming it. To make the problem more interesting, suppose that the producer has to wait until the consumer is finished before it generates more data. In a polling system, the consumer would waste many CPU cycles while it waited for the producer to produce. Once the producer was finished, it would start polling, wasting more CPU cycles waiting ...