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中科大操作系统原理与实现课件4_Threads2.pdf

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操作系统原理与设计 第4章Threads2（线程2） 陈香兰 中国科学技术大学计算机学院 December20,2009 ...... 提纲 OSExamplesforThread ThreadScheduling OSExamplesforThreadScheduling 小结和作业 ...... Outline OSExamplesforThread ThreadScheduling OSExamplesforThreadScheduling 小结和作业 ...... WindowsXPThreadsI IAnWindowsXPapplicationrunsasaseperateprocess,and eachprocessmaycontainoneormorethreads. IImplementstheone-to-onemapping Ieachuser-levelthreadmapstoanassotiatedkernelthread Ianythreadbelongingtoaprocesscanaccesstheaddressspace oftheprocess IEachthreadcontains IAthreadid IRegisterset ISeparateuserandkernelstacks IPrivatedatastoragearea ITheregisterset,stacks,andprivatestorageareaareknownas thecontextofthethreads ...... WindowsXPThreadsII ITheprimarydatastructuresofathreadinclude: IETHREAD(executivethreadblock) IKTHREAD(kernelthreadblock) ITEB(threadenvironmentblock) ...... WindowsXPThreadsIII ...... LinuxThreads ILinuxreferstothemastasksratherthanthreads IThreadcreationisdonethroughclone()systemcall Iclone()allowsachildtasktosharetheaddressspaceof theparenttask(process) Iclone()VS.fork() ...... JavaThreads IJava在语言级提供线程创建和管理支持功能 IJavathreadsaremanagedbytheJVM,notuser-levellibraryor kernel IJavathreadsmaybecreatedby: IExtendingThreadclass IImplementingtheRunnableinterfaceJava ...... ThreadStates ...... Outline OSExamplesforThread ThreadScheduling OSExamplesforThreadScheduling 小结和作业 ...... ThreadScheduling Iuser-levelthread:kernel-levelthread(orLWP) ILocalScheduling–Howthethreadslibrarydecideswhich threadtoputontoanavailableLWP Imany-to-one,many-to-manymodels Iprocess-contentionscope,PCS IGlobalScheduling–Howthekerneldecideswhichkernel threadtorunnext Imany-to-one,many-to-many&one-to-onemodels Isystem-contentionscope,SCS ...... PthreadSchedulingAPII IPOSIXPthreadAPIallowsspecifyingeitherPCSorSCS duringthreadcreation IPTHREADSCOPEPROCESS,many-to-many IPTHREADSCOPESYSTEM,one-to-one IcreateandbindanLWPforeachuser-levelthread Iexample #include<pthread.h> #includ