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A Structural Operational Semantics for PLEX

Fulltext:


Authors:

Johan Lindhult

Publication Type:

Report - MRTC

ISRN:

MDH-MRTC-166/2004-1-SE

Abstract

Programming Language for EXchanges, PLEX, is a pseudo-parallel and event-driven real-time language developed by Ericsson. The language is designed for, and used in, central parts of the AXE telephone switching system. The language has a signal paradigm as its top execution level, and it is event-based in the sense that only events, encoded as signals, can trigger code execution. Due to the fact that a PLEX program file consist of several independent subprograms, in combination with an execution model where new jobs are spawned and put in queues, we also classify the language as pseudo-parallel. This report presents a structural operational semantics for fundamental parts of the language, i.e., over jumps and signal sending statements, and it should be seen in a further perspective, where the aim is to extend and modify the language with a possibility to run in a multi-processor environment. Earlier attempts to map the language to description languages, like SDL, have not been as successful as expected, which is probably due to the fact that the semantics of the language and its execution model have not been paid enough attention. With this report, a formal basis for further investigations in that direction is provided.

Bibtex

@techreport{Lindhult664,
author = {Johan Lindhult},
title = {A Structural Operational Semantics for PLEX},
number = {ISSN 1404-3041 ISRN MDH-MRTC-166/2004-1-SE},
month = {December},
year = {2003},
url = {http://www.es.mdu.se/publications/664-}
}