COREMO: a CORBA real time extension model and its Ada 95 implementation

Abstract

In this paper, we present our COHBA implementation in Ada 95 after highlighting t.he benefits of its integt"ation int.o Ada 95. Afterwards, we investigate how to conciliate real-time with openness so that one can develop real-time CORBA-compliant applications. Since <·eal-timc syst.ems 1·equire con·ect execution and results that are produced on t.imc, we need to address scheduling policies and synchi'Onizat.ion issues. Different scheduling policies are investigated as well as a synchronization model to manage t.he multiple concuncnt. accesses t.o the object's attributes. As a result., a rea)-t.ime ext.ension t.o the COH.BA model is proposed and an Ada 95 implementation of t.he model is presented. Then we recommend an associated framework for the development of distribut.ed soft. real-time components and for their utilization in the context. of open systems. The implement.at.ion of the model will help t.he evaluat.ion of t.he relative performance of the different policies via simulation. We will en this paper with some prelimina<·y rcsult.s and a discussion about. experiments planned for the future.