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The Execution Model of APZ/PLEX - An Informal Description

Fulltext:


Authors:

Johan Lindhult, Bo Lindell

Publication Type:

Report

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.The language PLEX and the AXE system has been the subject of study both in a number of master thesis projects and in several other publications. However, only brief descriptions of the execution model of PLEX have been presented in these works.The language and its execution model are tightly connected and it is not possible to separate one from the other. This report presents a thorough description of fundamental parts of the language and it also serves as a detailed introduction to the execution model of PLEX.

Bibtex

@techreport{Lindhult663,
author = {Johan Lindhult and Bo Lindell},
title = {The Execution Model of APZ/PLEX - An Informal Description},
month = {December},
year = {2002},
url = {http://www.es.mdu.se/publications/663-}
}