Designing Embedded Systems with the SIGNAL Programming Language Sync
This book is about synchronous programming for the design of, safety critical, embedded systems, such as automotive systems, avionics, nuclear power plants and telecommunication systems. The techniques presented promote the use of formal concepts, i.e. th
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Designing Embedded Systems with the SIGNAL Programming Language Synchronous, Reactive Specification
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Designing Embedded Systems with the SIGNAL Programming Language
Abdoulaye Gamati´e
Designing Embedded Systems with the SIGNAL Programming Language Synchronous, Reactive Specification
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Abdoulaye Gamati´e CNRS - UMR 8022 (LIFL) INRIA Lille - Nord Europe Parc scientifique de la Haute Borne Park Plaza - Bˆatiment A 40 avenue Halley 59650 Villeneuve d’Ascq, France [email protected]
ISBN 978-1-4419-0940-4 e-ISBN 978-1-4419-0941-1 DOI 10.1007/978-1-4419-0941-1 Springer New York Dordrecht Heidelberg London Library of Congress Control Number: 2009930637 c Springer Science+Business Media, LLC 2010 All rights reserved. This work may not be translated or copied in whole or in part without the written permission of the publisher (Springer Science+Business Media, LLC, 233 Spring Street, New York, NY 10013, USA), except for brief excerpts in connection with reviews or scholarly analysis. Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed is forbidden. The use in this publication of trade names, trademarks, service marks, and similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights. Printed on acid-free paper Springer is part of Springer Science+Business Media (www.springer.com)
To Leila, and the memory of Boubakar, Fanta, and Tantie
Foreword
I am very pleased to play even a small part in the publication of this book on the S IGNAL language and its environment P OLYCHRONY. I am sure it will be a significant milestone in the development of the S IGNAL language, of synchronous computing in general, and of the dataflow approach to computation. In dataflow, the computation takes place in a producer–consumer network of independent processing stations. Data travels in streams and is transformed as these streams pass through the processing stations (often called filters). Dataflow is an attractive model for many reasons, not least because it corresponds to the way production, transportation, and communication are typically organized in the real world (outside cyberspace). I myself stumbled into dataflow almost against my will. In the mid-1970s, Ed Ashcroft and I set out to design a “super” structured programming language that, we hoped, would radically simplify proving assertions about programs. In the end, we decided that it had to be declarative. However, we also were determined that iterative algorithms could be expressed directly, without circumlocutions such as the use of a tail-recursive function. The language that resulted, which we named L UCID, was much less traditional then we would have liked. L UCID statements are equations in a kind of executable temporal logic that specify the (time) sequences of variables involved in an iteration. We had originally planned t
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