unix multi-process programming

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1、[LUPGHome][Tutorials][RelatedMaterial][Essays][ProjectIdeas][SendComments]v1.2UnixMulti-ProcessProgrammingandInter-ProcessCommunications(IPC)TableOfContents:1.PrefaceAndMotivation2.WhatIsAUnixProcess3.ProcessCreation1.Thefork()SystemCall4.ChildProcessTermination1.Thewait()SystemCall2.Async

2、hronousChildDeathNotification5.CommunicationsViaPipes1.WhatIsAPipe?2.Thepipe()SystemCall3.Two-WayCommunicationsWithPipes6.NamedPipes1.WhatIsANamedPipe?2.CreatingANamedPipeWithThemknodCommand3.OpeningANamedPipeForReadingOrWriting4.Reading/WritingFrom/ToANamedPipe5.NamedPipe-ACompleteExample

3、7.FewWordsAboutSockets8.SystemVIPC1.PermissionIssues1.PrivateVs.Public2.AccessPermissionModes-The'ipc_perm'Structure3.SystemUtilitiesToAdministerSystem-VIPCResources2.UsingMessageQueues1.WhatAreMessageQueues?2.CreatingAMessageQueue-msgget()3.TheMessageStructure-structmsgbuf4.WritingMessage

4、sOntoAQueue-msgsnd()5.ReadingAMessageFromTheQueue-msgrcv()6.MessageQueues-ACompleteExample3.ProcessSynchronizationWithSemaphores1.WhatIsASemaphore?WhatIsASemaphoreSet?2.CreatingASemaphoreSet-semget()3.SettingAndGettingSemaphoreValuesWithsemctl()4.UsingSemaphoresForMutualExclusionWithsemop(

5、)5.UsingSemaphoresForProducer-ConsumerOperationsWithsemop()6.Semaphores-ACompleteExample4.SharedMemory1.Background-VirtualMemoryManagementUnderUnix2.AllocatingASharedMemorySegment3.AttachingAndDetachingASharedMemorySegment4.PlacingDataInSharedMemory5.DestroyingASharedMemorySegment6.AComple

6、teExample5.AGeneralizedSysVResourceIDCreation-ftok()PrefaceAndMotivationOneofthestrongfeaturesofUnix-likeoperatingsystems,istheirabilitytorunseveralprocessessimultaneously,andletthemallsharetheCPU(s),memory,andotherresources.Anynone-trivialsystemdevelopedonUnixsystemswillsoonerorlaterresor

7、ttosplittingitstasksintomorethanoneprocess.True,manytimesthreadswillbepreferred(thoughtthesearecandidatesforaseparatetutorial),butthemethodsusedinbothofthemtendtoberathersimilar-howtostartandstopprocesses,howtocommunicatewithotherprocesses,howtosynchronizeproc