Concurrency Programming Guide

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1、ConcurrencyProgrammingGuideContentsIntroduction7OrganizationofThisDocument7ANoteAboutTerminology8SeeAlso8ConcurrencyandApplicationDesign9TheMoveAwayfromThreads10DispatchQueues10DispatchSources11OperationQueues12AsynchronousDesignTechniques12DefineYourApplication

2、’sExpectedBehavior13FactorOutExecutableUnitsofWork13IdentifytheQueuesYouNeed14TipsforImprovingEfficiency14PerformanceImplications15ConcurrencyandOtherTechnologies15OpenCLandConcurrency15WhentoUseThreads16OperationQueues17AboutOperationObjects17ConcurrentVersusNo

3、n-concurrentOperations18CreatinganNSInvocationOperationObject19CreatinganNSBlockOperationObject20DefiningaCustomOperationObject21PerformingtheMainTask21RespondingtoCancellationEvents22ConfiguringOperationsforConcurrentExecution24MaintainingKVOCompliance27Customi

4、zingtheExecutionBehaviorofanOperationObject28ConfiguringInteroperationDependencies29ChanginganOperation’sExecutionPriority29ChangingtheUnderlyingThreadPriority302012-12-13

5、Copyright©2012AppleInc.AllRightsReserved.2ContentsSettingUpaCompletionBlock30TipsforImplem

6、entingOperationObjects31ManagingMemoryinOperationObjects31HandlingErrorsandExceptions32DetermininganAppropriateScopeforOperationObjects32ExecutingOperations33AddingOperationstoanOperationQueue33ExecutingOperationsManually34CancelingOperations36WaitingforOperatio

7、nstoFinish36SuspendingandResumingQueues37DispatchQueues38AboutDispatchQueues38Queue-RelatedTechnologies41ImplementingTasksUsingBlocks41CreatingandManagingDispatchQueues43GettingtheGlobalConcurrentDispatchQueues43CreatingSerialDispatchQueues44GettingCommonQueuesa

8、tRuntime45MemoryManagementforDispatchQueues45StoringCustomContextInformationwithaQueue46ProvidingaCleanUpFunctionForaQueue46AddingTaskstoaQueue47AddingaSingleTasktoaQueue48PerformingaCompletionBlockWhenaTaskIsDone49PerformingLoopIterationsConcurrently50Performin

9、gTasksontheMainThread51UsingObjective-CObjectsinYourTasks51SuspendingandResumingQueues52UsingDispatchSemaphorestoRegulatetheUseofFiniteResources52WaitingonGroupsofQue