OperatingSystemFeatureofOSDefinitionofOSConceptofProcessEvolutionofProcessmodelEssentialofCocurrencyEssentialofCocurrencyCocurrentVSParellelEfficiencyofCocurrencyEfficiencyofCocurrencyChallengecausedbycocurrentSampleofsynchronismSampleofsynchronism(cont.)Sampleofsynchronism(cont.)ConceptofProcessProcessVSProgramDefinitionofProcessProcessStates(1)ProcessStates(2)ProcessStatestransitionsComplexProcessStates(1)ProcessStatesinWinXP/2KProcessstatesinLinux(1)ProcessstatesinLinux(2)ProcessstatesinLinux(3)DataStructureofProcessContentofPCBTask_StructinLinuxPCBTableProcessImageOperatingSystemSchedulingGoalofSchedulingSchedulinginbatchsystemThree-levelschedulingSchedulingininteractivesystemSchedulingininteractivesystemSchedulingimplementationCommunicationbetweenprocessesExclusion:SpoolerdirectoryExclusion:SpoolerdirectorySynchronism:Driver-ConductorAnalysisaboutIPCproblemIPCproblem:producer-consumerIPCproblem:diningphilosophersIPCproblem:Reader-WriterIPCproblem:SleepingBarberConceptaboutmutualexclusionConceptaboutmutualexclusionConceptaboutSynchronismModelingProblemmodelsofIPCSolutionsofIPCproblemsBusywaitingDisablinginterruptsLockvariableDrawbackoflockvariableStrictalternationDrawbackofstrictalternationDekker’ssolutionPeterson’ssolutionApplicationofPeterson’ssolutionTestandSetLock(TSL)solutionAnalysisof“Busywaiting”Sleep-WakeupSimpleSleep-WakeupsolutionSolutionof“Producer-Consumer”DisadvantageofthissolutionSemaphoresolutionSemaphoresolutionSampleofsemaphoresolutionAnalysisof“producer-consumer”Solutionof“Producer-Consumer”Analysisof“Reader-Writer”GiveprioritytoReaderKeepfairness:reader-writherAnalysisof“diningphilosophers”Solutionof“diningphilosophers”Solutionof“diningphilosophers”Analysisof“SleepingBarber”Solutionof“Sleepingbarber”ClassexerciseMonitorsolutionMonitor:producer-consumerMessagePassingSolutionof“Producer-Consumer”OperatingSystem