QNX Neutrino System Architecture.pdf

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1、QNX®Neutrino®RTOSSystemArchitectureForrelease6.5.0©2012,QNXSoftwareSystemsLimited©19962012,QNXSoftwareSystemsLimited.Allrightsreserved.QNXSoftwareSystemsLimited1001FarrarRoadKanata,OntarioCanadaK2K0B3Voice:+1613591-0931Fax:+1613591-3579Email:info@qnx.comWeb:http://www.

2、qnx.com/Electroniceditionpublished2012QNX,Momentics,Neutrino,Aviage,Photon,PhotonmicroGUI,andFoundry27aretrademarksofQNXSoftwareSystemsLimited,whichareregisteredtrademarksand/orusedincertainjurisdictions.Allothertrademarksbelongtotheirrespectiveowners.ContentsAboutThis

3、GuidexiiiWhatyoullfindinthisguidexvTypographicalconventionsxviNotetoWindowsusersxviiTechnicalsupportxvii1ThePhilosophyofQNXNeutrino1Designgoals3AnembeddablePOSIXOS?3Productscaling3WhyPOSIXforembeddedsystems?4WhyQNXNeutrinoforembeddedsystems?5Microkernelarchitecture6TheO

4、Sasateamofprocesses8Atruekernel8Systemprocesses9Interprocesscommunication10QNXNeutrinoasamessage-passingoperatingsystem10Networkdistributionofkernels11Single-computermodel11Flexiblenetworking112TheQNXNeutrinoMicrokernel13Introduction15TheimplementationofQNXNeutrino16PO

5、SIXrealtimeandthreadextensions16Systemservices16Threadsandprocesses17Threadattributes20Threadscheduling24Whenareschedulingdecisionsaremade?24Schedulingpriority25Schedulingpolicies26June14,2012Contentsiii©2012,QNXSoftwareSystemsLimitedIPCissues31Threadcomplexityissues32

6、Synchronizationservices33Mutexes:mutualexclusionlocks34Condvars:conditionvariables35Barriers36Sleeponlocks38Reader/writerlocks39Semaphores39Synchronizationviaschedulingpolicy40Synchronizationviamessagepassing40Synchronizationviaatomicoperations41Synchronizationservices

7、implementation41Clockandtimerservices42Timecorrection43Timers43Interrupthandling45Interruptlatency45Schedulinglatency46Nestedinterrupts47Interruptcalls483InterprocessCommunication(IPC)53Synchronousmessagepassing55MsgReply()vsMsgError()58Messagecopying58Simplemessages60

8、Channelsandconnections61Pulses63Priorityinheritanceandmessages63Message-passingAPI64RobustimplementationswithSend/Rec