Free Concurrent Programming in Java: State Dependence Tutorial

“> Two kinds of enabling conditions are generally needed to perform any action: External. An object receives a message requesting that an action be performed. Internal. The object is in an appropriate state to perform the action. As a non-programming example, suppose you are asked to write down a telephone message. To do this, you need to have a pencil and paper (or some other recording device). Exclusion techniques are mainly concerned with maintaining invarian 
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