操作系统英文教学课件Chapter1Introduction.pptx

Chapter1:Introduction

TheBookOperatingSystemConcepts–7thEdition,Jan12,20051.2Silberschatz,GalvinandGagne?2005

Gradingpolicy??????期中考核成绩（10%）课程项目成绩（10%）课后作业成绩（10%）考勤成绩（10%）实验成绩（20%）期末考试成绩（40%）OperatingSystemConcepts–7thEdition,Jan12,20051.3Silberschatz,GalvinandGagne?2005

Objectives?Toprovideagrandtourofthemajoroperatingsystemscomponents?ToinfluenceComputationalThinkingOperatingSystemConcepts–7thEdition,Jan12,20051.4Silberschatz,GalvinandGagne?2005

WhatisanOperatingSystem??Aprogramthatactsasanintermediarybetweenauserofacomputerandthecomputerhardware.?Operatingsystemgoals:?Executeuserprogramsandmakesolvinguserproblemseasier.?Makethecomputersystemconvenienttouse.?Usethecomputerhardwareinanefficientmanner.OperatingSystemConcepts–7thEdition,Jan12,20051.5Silberschatz,GalvinandGagne?2005

ComputerSystemStructure?Computersystemcanbedividedintofourcomponents?Hardware–providesbasiccomputingresources?CPU,memory,I/Odevices?Operatingsystem?Controlsandcoordinatesuseofhardwareamongvariousapplicationsandusers?Applicationprograms–definethewaysinwhichthesystemresourcesareusedtosolvethecomputingproblemsoftheusers?Wordprocessors,compilers,webbrowsers,databasesystems,videogames?Users?People,machines,othercomputersOperatingSystemConcepts–7thEdition,Jan12,20051.6Silberschatz,GalvinandGagne?2005

FourComponentsofaComputerSystemOperatingSystemConcepts–7thEdition,Jan12,20051.7Silberschatz,GalvinandGagne?2005

OperatingSystemDefinition?OSisaresourceallocator?ManagesallresourcesDecidesbetweenconflictingrequestsforefficientandfairresourceuse??OSisacontrolprogram?ControlsexecutionofprogramstopreventerrorsandimproperuseofthecomputerOperatingSystemConcepts–7thEdition,Jan12,20051.8Silberschatz,GalvinandGagne?2005

OperatingSystemDefinition(Cont.)?Nouniversallyaccepteddefinition?“Everythingavendorshi