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ID:51079325
大小:1.02 MB
页数:75页
时间:2020-03-18
《操作系统原理(ch8).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、OperatingSystemOverviewChapter21OperatingSystemAprogramthatcontrolstheexecutionofapplicationprogramsAresourcemanagementsoftwareDesignerviewpointAninterfacebetweenapplicationsandhardwareAvirtualmachineUserviewpoint2OperatingSystemObjectivesConvenienceMakesthecomputermoreconvenienttouseEff
2、iciencyAllowscomputersystemresourcestobeusedinanefficientmannerAbilitytoevolvePermiteffectivedevelopment,testing,andintroductionofnewsystemfunctionswithoutinterferingwithservice3LayersofComputerSystem4ServicesProvidedbyOperatingSystemsProgramdevelopmentEditorsanddebuggersProgramexecution
3、AccesstoI/OdevicesControlledaccesstofilesSystemaccess5ServicesProvidedbyOperatingSystemsErrordetectionandresponseInternalandexternalhardwareerrorsMemoryerrorDevicefailureSoftwareerrorsArithmeticoverflowAccessforbiddenmemorylocationsOperatingsystemcannotgrantrequestofapplication6ServicesP
4、rovidedbyOperatingSystemsAccountingCollectusagestatisticsMonitorperformanceUsedtoanticipatefutureenhancementsUsedforbillingpurposes7OperatingSystemsasResourceManagersResponsibleformanagingresourcesFunctionssamewayasordinarycomputersoftwareItisprogramthatisexecutedOperatingsystemrelinquis
5、hescontroloftheprocessor89EaseofEvolutionofanOperatingSystemHardwareupgradesplusnewtypesofhardwareNewservicesinresponsetouserdemandorinresponsetotheneedsofsystemmanagersFixesanyOShasfaults10EvolutionofOperatingSystemsSerialProcessingNooperatingsystemMachinesrunfromaconsolewithdisplayligh
6、ts,toggleswitches,inputdevice,andprinterScheduletimeSetupincludedloadingthecompiler,sourceprogram,savingcompiledprogram,andloadingandlinking11EvolutionofOperatingSystemsSimpleBatchSystemsMonitorsSoftwarethatcontrolsthesequenceofeventsBatchjobstogetherProgrambranchesbacktomonitorwhenfinis
7、hed1213JobControlLanguage(JCL)SpecialtypeofprogramminglanguageProvidesinstructiontothemonitorWhatcompilertouseWhatdatatouse14HardwareFeaturesMemoryprotectionDonotallowthememoryareacontainingthemonitortobealteredTimerPreventsajobfrommonopolizingthesystem15HardwareFeaturesP
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