By Marvin Zelkowitz (Ed.)
Given that its first quantity in 1960, Advances in pcs has awarded particular assurance of concepts in and software program and in machine idea, layout, and purposes. It has additionally supplied contributorswith a medium during which they could learn their matters in better intensity and breadth than that allowed by means of general magazine articles. hence, many articles became ordinary references that stay of important, lasting price regardless of the swift development happening within the box.
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Extra resources for Advances in Computers, Vol. 45: Emphasizing Parallel Programming Techniques
This can be modeled by a replicated activity. Another use for replicated activities is defining a single activity performed by an unspecified number of people, like a meeting. Replication can be implemented in a workflow system by a loop that creates all required parallel processes; to synchronize these processes, an integer semaphore initialized to n might be used. Again, the semantics of replication cannot be expressed with a fixed P/T net, but can be expressed using high-level nets. CONTROL IN MULTI-THREADED INFORMATION SYSTEMS 13 3.
A new alternative is specified by giving: (1) an or-node where the exception is raised; (2) An optional exception handler given by either a new activity a ; ( 3 ) an or-node where control returns after exception handling. The addition of an alternative can be constructed with three more basic operations on the model: adding an or-node; adding a connection between two or-nodes; adding an activity. 1 (Adding an or-node) The new model resulting from the addition of an or-node o within a connection c = SH d is defined by Table V.
Important kmds of low-level nets are elementary nets and place/transition nets. In the second group, tokens represent not just boolean conditions, but complex data items or predicates. Important kinds of high-level nets are colored Petri nets, predicate/transition nets, and environment/transition nets. 1 Place/Transition Nets Place/transition nets are adequate to model basic control constructs. However, they are not useful to model more complex forms of control like recursion and replication of activities, let alone other process model issues like functionality, timing, resource utilization, etc.