Download Logic Programming: The 14th International Conference by Lee Naish PDF

By Lee Naish

8-12 July 1997, Leuven, Belgium The foreign convention on common sense Programming is the most annual convention subsidized via the organization for good judgment Programming. It covers the most recent examine in components equivalent to theoretical foundations, constraints, concurrency and parallelism, deductive databases, language layout and implementation, non-monotonic reasoning, and common sense programming and the Internet.

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From state machines to PN: a) arc of a state machine; b) arc of the simplest Petri net, a state machine; c) transition in a Petri net (as seen later, with weight 1) As a consequence, PNs will be graphically represented by a graph having two types of nodes — transitions and places — these nodes being connected between them by arcs from places to transitions and from transitions to places. Note that the arcs never connect two similar nodes. e having arcs connecting these places to T, will often simply be called the input places of T; similarly, the places connected to a transition by arcs going from T to these places will be called output places of the transition.

The behavior of the system must fulfill the indivisibility assumption, to be coherent with the behavior of the model. Thus, modeling must represent the real indivisibility that exists in systems. Conversely, if some sub-behaviors are not indivisible, they cannot be represented by only one transition, and must be represented by a set of transitions, each of which represents the various indivisible sub-behaviors. 2. Tasks and processes Of course, a program or a process can be represented by a state machine: – the initial state is given by the value of the program counter and of the program variables immediately after their initialization; – the execution of a transition is defined by the set of actions that is the execution of the program instruction or intructions associated with this transition; 6 Petri Nets – the execution leads to a next state that includes the new values of the program counter and of all program variables that have been modified by this transition.

E. 1. It clearly appears that the corresponding global PNs are different, so they may have different behaviors. 3c. A1; …. A2, leads to the marking in which the places AT1, A1, AT2 and A2 are marked. In this (global) marking, no transition is firable; in fact, the PN has now no firable transition, and thus the model (and the modeled system) is fully blocked, and said to be in deadlock. Of course, such a behavior is incorrect and has to be checked and avoided. 2. Conclusion Two quite important conclusions can be derived from this example.

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