Operating Systems In Depth: Design And Programming

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This page intentionally left blank Operating Systems in Depth This page intentionally left blank OPERATING SYSTEMS IN DEPTH Thomas W. Doeppner Brown University JOHN WILEY & SONS, INC. vice-president & executive publisher executive editor executive marketing manager production editor editorial program assistant senior marketing assistant executive media editor cover design cover photo Donald Fowley Beth Lang Golub Christopher Ruel Barbara Russiello Mike Berlin Diana Smith Thomas Kulesa Wendy Lai Thomas W. Doeppner Cover photo is of Banggai Cardinalfish (Pterapogon kauderni), taken in the Lembeh Strait, North Sulawesi, Indonesia. This book was set in 10/12 Times Roman. The book was composed by MPS Limited, A Macmillan Company and printed and bound by Hamilton Printing Company. This book is printed on acid free paper. ⬁ Founded in 1807, John Wiley & Sons, Inc. has been a valued source of knowledge and understanding for more than 200 years, helping people around the world meet their needs and fulfill their aspirations. Our company is built on a foundation of principles that include responsibility to the communities we serve and where we live and work. In 2008, we launched a Corporate Citizenship Initiative, a global effort to address the environmental, social, economic, and ethical challenges we face in our business. Among the issues we are addressing are carbon impact, paper specifications and procurement, ethical conduct within our business and among our vendors, and community and charitable support. For more information, please visit our website: www.wiley.com/go/citizenship. Copyright © 2011 by John Wiley & Sons, Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as permitted under Sections 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, Inc., 222 Rosewood Drive, Danvers, MA 01923 (Web site: www.copyright.com). Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030-5774, (201) 748-6011, fax (201) 748-6008, or online at: www. wiley.com/go/permissions. Evaluation copies are provided to qualified academics and professionals for review purposes only, for use in their courses during the next academic year. These copies are licensed and may not be sold or transferred to a third party. Upon completion of the review period, please return the evaluation copy to Wiley. Return instructions and a free of charge return shipping label are available at: www.wiley.com/ go/returnlabel. Outside of the United States, please contact your local representative. Library of Congress Cataloging in Publication Data: Doeppner, Thomas W. Operating systems in depth / Thomas W. Doeppner. p. cm. Includes index. ISBN 978-0-471-68723-8 (hardback) 1. Operating systems (Computers) I. Title. QA76.76.O63D64 2010 005.4’3—dc22 2010034669 Printed in the United States of America 10 9 8 7 6 5 4 3 2 1 To the memory of my father, Thomas W. Doeppner Sr. This page intentionally left blank Preface T he goal of this book is to bring together and explain current practice in operating systems. This includes much of what is traditionally covered in operating-system textbooks: concurrency, scheduling, linking and loading, storage management (both real and virtual), file systems, and security. However, I also cover issues that come up every day in operating-systems design and implementation but are not often taught in undergraduate courses. For example, I cover