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1、自考操作系统填空题汇总2TheUNIXsystemspecifiesthatthepermissionsoftheuserareread,,and・TherearethreetypesofdeviceI/O:inquiry,interrupt,channel_・Thefileaccessmethodisusuallysequentialaccess,directaccess,andaclassofkeyindexes・Fromtheuser'spointofview,UNIXsystemsaredividedintothreecategories:common(user),dire
2、ctory,special・Thefournecessaryconditionsforadeadlockaremutuallyexclusiveuse,retentionandwaiting,non-deprivation,andcircularwaiting・Thethreemostbasicstatesoftheprocessarepreparation,execution,andwaiting・Thetraditiorialoperatingsystemprovidesprogrammerswithaninterfacecalled_systeminvocations・The
3、developmentofman-machineinterfaceistheone-dimensionalcommandline,two~dimensiona1graphicalinterface,3dvirtualreality・65,theusualprocessschedulingalgorithmhas_firstservice,prioritynumbermethod,rotationmethod.Whendesigningareal-timeoperatingsystem,itisimportanttopayattentiontotwopoints,thefirstis
4、_reliabilityandthesecondis_security・Theoperatingsystemwithahierarchicalstructureusuallyputsthemanagementof_devicesattheinnermostlayer・Theauxiliarymemorycanonlytransferinformationwith_memory・ThefieldinformationoftheinterruptedprocessisstoredinthePCBbythe_interrupthandler.70,onewith50enduser'sco
5、mputersystemusingtimeslicerotationschedulingalgorithmforprocessscheduling,ifeachuseratthesametime,andignoretheschedulingtime,willcost100millisecondscanbegiventotheuserrequestresponse,theterminalresponsetimefor_2milliseconds・71,fileaccessmodemainlydependsontwofactors,relatedtofilemanagementandr
6、elatedtoequipmentmanagement・Thewayofexchanginginformationbetweenprocessesiscalled_boxcommunication・Whenmultiplethreadscollaborateonatask,thethreadmustworkthroughthe_PVoperation・74,iftheoperatingsystemconsistsofsystemresourcesordon'tcareorprocesstopromoteorderlikelyscenario,mayhaveformedadeadlo
7、ck.75,0inUNIXprocessisalsoreferredtoasexchangeprocess,itstaskistotransferprocessintoorout・Afterthesysteminitialization,exchangeprocessistogetstarted.Afteraprogramhasacquireda_workspace(datablock)_anda_PCD_,itsaysthataprocesshasbeencreat
