By Marvin Zelkowitz (Ed.)
On account that its first quantity in 1960, Advances in desktops has offered unique assurance of concepts in and software program and in machine conception, layout, and purposes. It has additionally supplied contributorswith a medium within which they could study their topics in larger intensity and breadth than that allowed through commonplace magazine articles. therefore, many articles became typical references that stay of important, lasting worth regardless of the quick progress happening within the box.
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Extra info for Advances in Computers, Vol. 45: Emphasizing Parallel Programming Techniques
The figure shows the translations in terms of Petri nets and the refinement mapping of a into a whole net. 3 Behavioral Properties One basic property of a good model is that it does not deadlock, that is, each process of the model reaches an output socket to produce a termination response to the environment. Inappropriate control structures can create deadlocks as in Fig. 8. 4 (Deadlock) A final marking M, is a deudlock in a process model if Mf(exit) = 0. 1 (Deadlock freedom) A model is deadlock-free if none of its final markings is a deadlock.
We will see (Section 5) that a special kind of non-numeric invariant is related to notions of correctness in control models. 4. The Simple Control Property Figure 4 shows a simple process model to approve a loan for a home. The first activity, a , is the customer’s application, then and-node x splits execution in two parallel activities ( b , credit approval and c, mortgage approval). After each activity, a choice is made (at or-nodes u and v). If both activities are successful, they synchronize in and-node y and the process proceeds to the exit node, so that the credit might be issued.
1 defines an algebra in which terms can be interpreted as threads satisfying all these goals. 2 shows that we can assign a unique thread to each place in a model if and only if the model has simple control. Moreover, if the model has no simple control, analysis of threads sheds light into the reasons for not having simple control. 1 Thread Labels and Threads The definition of threads is done indirectly via thread labels. e. a set of paths that is part of a process that begins with a token in p ) .