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ID:57016425
大小:951.50 KB
页数:75页
时间:2020-07-26
《操作系统精髓与设计原理英文课件.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、OperatingSystemOverviewChapter21OperatingSystemAprogramthatcontrolstheexecutionofapplicationprogramsAresourcemanagementsoftwareDesignerviewpointAninterfacebetweenapplicationsandhardwareAvirtualmachineUserviewpoint2OperatingSystemObjectivesConvenienceMakesthecomputermoreconvenientto
2、useEfficiencyAllowscomputersystemresourcestobeusedinanefficientmannerAbilitytoevolvePermiteffectivedevelopment,testing,andintroductionofnewsystemfunctionswithoutinterferingwithservice3LayersofComputerSystem4ServicesProvidedbyOperatingSystemsProgramdevelopmentEditorsanddebuggersProg
3、ramexecutionAccesstoI/OdevicesControlledaccesstofilesSystemaccess5ServicesProvidedbyOperatingSystemsErrordetectionandresponseInternalandexternalhardwareerrorsMemoryerrorDevicefailureSoftwareerrorsArithmeticoverflowAccessforbiddenmemorylocationsOperatingsystemcannotgrantrequestofapp
4、lication6ServicesProvidedbyOperatingSystemsAccountingCollectusagestatisticsMonitorperformanceUsedtoanticipatefutureenhancementsUsedforbillingpurposes7OperatingSystemsasResourceManagersResponsibleformanagingresourcesFunctionssamewayasordinarycomputersoftwareItisprogramthatisexecuted
5、Operatingsystemrelinquishescontroloftheprocessor89EaseofEvolutionofanOperatingSystemHardwareupgradesplusnewtypesofhardwareNewservicesinresponsetouserdemandorinresponsetotheneedsofsystemmanagersFixesanyOShasfaults10EvolutionofOperatingSystemsSerialProcessingNooperatingsystemMachines
6、runfromaconsolewithdisplaylights,toggleswitches,inputdevice,andprinterScheduletimeSetupincludedloadingthecompiler,sourceprogram,savingcompiledprogram,andloadingandlinking11EvolutionofOperatingSystemsSimpleBatchSystemsMonitorsSoftwarethatcontrolsthesequenceofeventsBatchjobstogetherP
7、rogrambranchesbacktomonitorwhenfinished1213JobControlLanguage(JCL)SpecialtypeofprogramminglanguageProvidesinstructiontothemonitorWhatcompilertouseWhatdatatouse14HardwareFeaturesMemoryprotectionDonotallowthememoryareacontainingthemonitortobealteredTimerPreventsajobfrommonopolizingth
8、esystem15HardwareFeaturesP
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