雨课堂学堂在线学堂云《Principles of Operating Systems (操作系统原理)（云南）》单元测试考核答案

第1题Anoperatingsystemthatallowsmultipleuserstosubmitseveraljobstoacomputersystemforcentralizedprocessingiscalled().ANetworkoperatingsystemBTime-sharingoperatingsystemCReal-timeoperatingsystemDBatchprocessingsystem第2题()Meansthattwoormoreactivitiesoreventsoccurwithinthesametimeinterval.AparallelBConcurrencyCsharedDSynchronize第3题Theoperatingsystem()isdesignedwithalayeredstructure.AUNIXBIBMOS/360CMulticsDMS-DOS第4题Thereareseveraloperationmodesofbatchprocessingsystem().AExecutionsystemBOnlinebatchCEarlybatchprocessingDOfflinebatchprocessing正确答案：ABCD第5题Thetime-sharingoperatingsystemhasthecharacteristicsof().ATimelinessBMultipathCInteractivityDExclusivity正确答案：ABCD第6题Multiprogrammingtechnologymustbeimplementedonmultipleprocessors.第7题Thevirtualmachinecansimulateahardwaresystemfunctionthroughsoftware,andcanvirtualizeacomputerintomultiplecomputers.第8题Computerresourceswithmutuallyexclusiveaccesscannotbeshared.第9题Real-timeoperatingsystemsdonotneedtohavestronginteractioncapabilities.第10题Minix3wasdevelopedbyProfessorDijkstra,DepartmentofComputerScience,VrijeUniversity,Netherlands.第1题Thecoreproblemofprocessormanagementis().AProcessorschedulingBProcessmanagementCJobmanagementDThreadmanagement第2题()Istheonlysignthattheoperatingsystemperceivestheexistenceofaprocess.AJCBBTCBCFCBDPCB第3题Whentheprocesstimesliceintheexecutionstatearrives,ittransitionsto()state.ABlockBReadyCcarryoutDindefinite第4题Theprocessimageincludesseveralelementssuchas().AProcesscorestackBPCBCProcessblockDProcessdatasegment正确答案：ABCD第5题Commondeprivationprinciplesinprocessorschedulingstrategiesare().ATimesliceprincipleBFCFSprinciplesCPriorityprincipleDPrincipleofshortestpriority正确答案：ACD第6题Theprocesshasalifecycle,dynamicgeneration,dynamicexecution,anddynamicdemise.第7题Thereadystatemeansthataprocessalreadyhasallexecutionconditionsexcepttheprocessor.第8题Processcontextswitchingcanoccurinbothkernelmodeandusermode.第9题Oneadvantageofkernel-levelthreadsisthatsystemoverheadisrelativelysmall.第10题Onedisadvantageofthemulti-levelfeedbackround-robinschedulingalgorithmisthatitcancausestarvation.Chapter3-Exercise第1题Comparingtheexecutionofsequentialprogramsandconcurrentprograms().AbasicallythesameBTheformerisgenerallyfasterinexecutiontimeCcompletelydifferentDThelatterhasafastoverallexecutiontime第2题IftheinitialvalueofthesemaphoreSemis2,andthecurrentvalueis-1,itmeansthatthereis()waitingprocess.AzeroBoneCtwoDthree第3题Ifyoudonotperform()operationontheprogramsegmentthataccessescriticalresources,theexecutionresultoftheprogramwillinevitablyloseitsclosureandreproducibility.AparallelBSynchronizeCasynchronousDMutuallyexclusive第4题Thebasiccharacteristicsoftheprocessinclude().ADynamicBSequentialCConcurrencyDAsynchrony正确答案：ACD第5题Thefollowingisamethodtoeliminatedeadlock().ApreventionBavoidCDetectionandrecoveryDIgnore正确答案：ABCD第6题Ifthesystemisinanunsafestate,itisnotnecessarilyadeadlockstate.第7题Allprocessesparticipatinginthedeadlockoccupyresources.第8题Pipelinecommunicationisalow-levelcommunicationbetweenprocesses.第9题Directconstraintsbetweenprocessesleadtomutualexclusionbetweenprocesses.第10题IfthecurrentvalueofthesemaphoreSis-5,itmeansthereare5waitingprocessesinthesystem.Chapter4-Exercise第1题Instoragemanagement,thepurposeofusingoverlayandexchangetechnologyis().AExpandmainmemorycapacityBRealizemainmemorysharingCSavestoragespaceDIncreaseCPUutilization第2题Dynamicrelocationtechnologydependson().ATargetprogramBAddressagencyCRelocationloaderDRelocationregister第3题Thefoundationofthevirtualstoragemanagementsystemistheprogram's()theory.ALocalityBGlobalCDynamicDVirtuality第4题Thebasicfunctionsofstoragemanagementare().AStorageprotectionandsharingBAddresstranslationCStorageprotectionandsharingDMemoryallocationandrecycling正确答案：ABCD第5题Thereplacementalgorithminrequestpagemanagementincludes()algorithm.AFirstinfirstoutBLeastrecentlyusedCNotoftenusedrecentlyDRandomreplacement正确答案：ABCD第6题Theworst-caseadaptationmethodfordynamicpartitionmanagementrequiresthatthefreeareasinthefreepartitiontablebearrangedinorderfromsmalltolarge.第7题Pagingstoragemanagementallowsaprocesstobeallocatedtonon-adjacentstoragespaces.第8题Whetheritispartitionmanagementorpagingmanagementwillgeneratealotofinternalfragmentation.第9题Insegmentmanagement,thereisnopossibilityofsystemjitter.第10题Segmentpagestoragemanagementneedstoaccessmemoryatleastthreetimesforeachdatafetch.Chapter5-Exercise第1题Themainpurposeofthefilesystemis().AImplementvirtualstorageBAccessbynameCImproveaccessspeedDUsedtostoresystemfiles第2题Thefilesystemrefersto().AFilecollectionBFiledescriptionCFileDirectoryDSoftwareanddatastructureformanagingfiles第3题Inthefilesystem,usersdirectlyuseexternalstoragein()way.ALogicaladdressBPhysicaladdressCNamespaceDVirtualaddress第4题Thefunctionsthatthefilesystemshouldhaveinclude().AAccessbynameBAllocatestoragespaceCImplementcatalogmanagementDProvideaccessmethods正确答案：ABCD第5题Therearealsodifferencesinhowfilesareorganizedonthecorrespondingstoragemedia.Usuallythefilestoragestructureis().AFlowstructureBSequentialstructureCLinkstructureDIndexstructure正确答案：BCD第6题Inthefilesecurityimplementationmethod,settingapasswordforthefileisamorecommonmethod.第7题Computerorganization,accessandstorageofinformationisachievedthroughthefilesystem.第8题Transparentaccesstofilesallowsuserstoseethelogicalstructureofthefile,butalsoknowitsphysicalstructureandsearchmethod.第9题Theconcatenatedfilestructureisnotonlysuitableforsequentialaccess,butalsosuitableforrandomaccess.第10题BoththeUNIXoperatingsystemandMS-DOSuseunstructuredfiles.Chapter6-Exercise第1题Intheoperatingsystem,usersusuallyuse()whenusingI/Odevices.APhysicaldevicenameBLogicaldevicenameCVirtualdevicenameDDeviceblocknumber第2题Accordingto()classification,thedevicecanbedividedintoblockdeviceandcharacterdevice.AbelongBOperatingcharacteristicsCSharedattributesDInformationExchangeUnit第3题()Algorithmisacommonlyusedalgorithmfordeviceallocation.AShortjobpriorityBBestfitCFirstcomefirstserveDFirstadaptation第4题Accordingtotheunitofinformationexchange,I/Odevicescanbedividedinto().ABlockdeviceBCharacterdeviceCHigh-speedequipmentDLowspeedequipment正确答案：AB第5题Acc