2011/08/23 by Flavio Corradini, Maria Rita Di Berardini, Walter Vogler
Computer Science · #cs.LO #cs.DC #cs.PF
paper · pdf · doi:10.4204/eptcs.64.3
published as EPTCS 64, 2011, pp. 31-43 · In Proceedings EXPRESS 2011, arXiv:1108.4077
arxiv created 2011/08/23 · arxiv updated 2011/08/24
We study two different ways to enhance PAFAS, a process algebra for modelling asynchronous timed concurrent systems, with non-blocking reading actions. We first add reading in the form of a read-action prefix operator. This operator is very flexible, but its somewhat complex semantics requires two types of transition relations. We also present a read-set prefix operator with a simpler semantics, but with syntactic restrictions. We discuss the expressiveness of read prefixes; in particular, we compare them to read-arcs in Petri nets and justify the simple semantics of the second variant by showing that its processes can be translated into processes of the first with timed-bisimilar behaviour. It is still an open problem whether the first algebra is more expressive than the second; we give a number of laws that are interesting in their own right, and can help to find a backward translation.