Overview
ABSTRACT
A real-time application implements computer systems or computerized systems working with man and destined for perception, observation, decision support and the conduction of dynamic processes. At this time, "real time" computing is therefore present in a large number of industrial fields, in the form of embedded systems in high-tech equipment (aerospace, nuclear) or of embedded systems produced in large quantities and at a low cost for more traditional equipment (cars, smart sensors, signaling systems). Although the taking into account of time in such computer systems can be carried out via several approaches, the interactions between process and system must be instantaneous, hence the centralizing and scheduling role played by the operating system.
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Read the articleAUTHORS
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Yvon TRINQUET : Professor at the University of Nantes (IUT de Nantes) - Head of the Real-Time Systems team at the Nantes Institute for Research in Communications and Cybernetics (IRCCyN).
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Jean-Pierre ELLOY : Professor at École Centrale de Nantes - Head of commercialization at the Nantes Institute for Research in Communications and Cybernetics (IRCCyN)
INTRODUCTION
This article presents the basic principles used in real-time executables. This term designates operating systems adapted to the particular context, in terms of time requirements, of computing described as "real time".
The article begins by presenting the problem of real-time computing and possible approaches.
Next, the structure of the executive and possible scheduling policies are discussed, leading to a presentation of generic services that can be found in industrial products.
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Real-time operating systems
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