Lookup NU author(s): Professor Maciej Koutny,
Dr Lukasz Mikulski,
Dr Marta Koutny
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
The design and analysis of concurrent computing systems is often concerned with fundamental behavioural propertiesinvolving system activities, e.g., boundedness, liveness, and persistence. This paper is about the latter property and a complementary property of nonviolence. Persistence means that an enabled activity cannot be disabled, whereasnonviolence means that executing an activity does not disable any other enabled activity.Since its introduction in the 1970s, persistence has been investigated assuming that each system activity is a single atomic action, but in the design of Globally Asynchronous Locally Synchronous (GALS) systems one also needs to allow activities represented by steps, each step being a set of simultaneously executed atomic actions. Dealing with step based execution semantics creates a wealth of new fundamental problems and questions. In particular, there aredifferent ways in which the standard notion of persistence (and nonviolence) could be lifted to the level of steps.We provide a rich classification of different types of step based persistence and nonviolence. We first do this for a general model of (step) transition systems. After that, we focus on Petri nets, and introduce a taxonomy of persistentand nonviolent steps and markings. We also characterise key structural properties of persistence and nonviolence,linking these behavioural notions with the presence of self-loops in Petri nets.
Author(s): Koutny M, Mikulski L, Pietkiewicz-Koutny M
Publication type: Article
Publication status: Published
Journal: Information Sciences
Print publication date: 01/07/2017
Online publication date: 31/01/2017
Acceptance date: 31/01/2017
Date deposited: 31/01/2017
ISSN (print): 0020-0255
ISSN (electronic): 1872-6291
Publisher: Elsevier Inc.
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