Sequential (default)- The semantics of the class are guaranteed only in the presence of a single thread of control. Only one thread of control can be executing in the method at any one time. Guarded- The semantics of the class are guaranteed in the presence of multiple threads of control. A guarded class requires collaboration among client threads to achieve mutual exclusion. Active- The class has its own thread of control. Synchronous- The semantics of the class are guaranteed in the presence of multiple threads of control mutual exclusion is supplied by the class.

UML建模讲义.ppt

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