Affiliations: Christian Albrecht Universität zu Kiel, Technische
Fakultät, Institut für Informatik, Hermann-Rodewaldstr. 3, 24118
Kiel, Germany. E-mail: hf@informatik.uni-kiel.de | Universität Mannheim, Fakultät für
Mathematik und Informatik, D7, 27, 68131 Mannheim, Germany. E-mail:
mcb@pi2.informatik.uni-mannheim.de
Abstract: In process algebras that allow for some form of disruption, it is
important to state when a process terminates. One option is to include a
termination action √. Another approach is that the 'final' executed
action of a process terminates the process. The semantics of the former
approach has been investigated in the literature in detail, e.g. by providing
consistent true-concurrency and operational descriptions. The 'final' executed
action termination approach, which is more adequate for modelling, still lacks
the existence of a detailed true concurrent description. In order to give a
true concurrency model of such a termination view, we introduce a new class of
event structures. This type of event structures models disabling by indicating
sets of precursor events. We show that the introduced class of event structures
has more expressive power with respect to event traces than the common event
structures. We also give a classification of the expressive power in terms of
sets of event traces. A consistency result of an operational and a denotational
semantics is shown.
Keywords: event structures, disruption, termination, expressive power, process algebra
