TaskScheduler.cs System::Threading::Tasks::TaskScheduler System::Threading::Tasks::TaskScheduler::TaskSchedulerDebuggerView System System::Threading System::Threading::Tasks // //TaskScheduler.cs // //Authors: //Jérémie"Garuma"Laval<jeremie.laval@gmail.com> //MarekSafar<marek.safar@gmail.com> // //Copyright(c)2009Jérémie"Garuma"Laval //Copyright2012Xamarin,Inc(http://www.xamarin.com) // //Permissionisherebygranted,freeofcharge,toanypersonobtainingacopy //ofthissoftwareandassociateddocumentationfiles(the"Software"),todeal //intheSoftwarewithoutrestriction,includingwithoutlimitationtherights //touse,copy,modify,merge,publish,distribute,sublicense,and/orsell //copiesoftheSoftware,andtopermitpersonstowhomtheSoftwareis //furnishedtodoso,subjecttothefollowingconditions: // //Theabovecopyrightnoticeandthispermissionnoticeshallbeincludedin //allcopiesorsubstantialportionsoftheSoftware. // //THESOFTWAREISPROVIDED"ASIS",WITHOUTWARRANTYOFANYKIND,EXPRESSOR //IMPLIED,INCLUDINGBUTNOTLIMITEDTOTHEWARRANTIESOFMERCHANTABILITY, //FITNESSFORAPARTICULARPURPOSEANDNONINFRINGEMENT.INNOEVENTSHALLTHE //AUTHORSORCOPYRIGHTHOLDERSBELIABLEFORANYCLAIM,DAMAGESOROTHER //LIABILITY,WHETHERINANACTIONOFCONTRACT,TORTOROTHERWISE,ARISINGFROM, //OUTOFORINCONNECTIONWITHTHESOFTWAREORTHEUSEOROTHERDEALINGSIN //THESOFTWARE. #ifNET_4_0||UNITY_5_3_OR_NEWER usingSystem.Collections.Generic; usingSystem.Diagnostics; namespaceSystem.Threading.Tasks { [DebuggerDisplay("Id={Id}")] [DebuggerTypeProxy(typeof(TaskSchedulerDebuggerView))] publicabstractclassTaskScheduler { sealedclassTaskSchedulerDebuggerView { readonlyTaskSchedulerscheduler; publicTaskSchedulerDebuggerView(TaskSchedulerscheduler) { this.scheduler=scheduler; } publicIEnumerable<Task>ScheduledTasks{ get{ returnscheduler.GetScheduledTasks(); } } } staticreadonlyTaskSchedulerdefaultScheduler=newTpScheduler(); [ThreadStatic] staticTaskSchedulercurrentScheduler; intid; staticintlastId=int.MinValue; publicstaticeventEventHandler<UnobservedTaskExceptionEventArgs>UnobservedTaskException; protectedTaskScheduler() { this.id=Interlocked.Increment(reflastId); } publicstaticTaskSchedulerFromCurrentSynchronizationContext() { varsyncCtx=SynchronizationContext.Current; if(syncCtx==null) thrownewInvalidOperationException("ThecurrentSynchronizationContextisnullandcannotbeusedasaTaskScheduler"); returnnewSynchronizationContextScheduler(syncCtx); } publicstaticTaskSchedulerDefault{ get{ returndefaultScheduler; } } publicstaticTaskSchedulerCurrent{ get{ if(currentScheduler!=null) returncurrentScheduler; returndefaultScheduler; } internalset{ currentScheduler=value; } } publicintId{ get{ returnid; } } publicvirtualintMaximumConcurrencyLevel{ get{ returnint.MaxValue; } } protectedabstractIEnumerable<Task>GetScheduledTasks(); protectedinternalabstractvoidQueueTask(Tasktask); protectedinternalvirtualboolTryDequeue(Tasktask) { returnfalse; } internalprotectedboolTryExecuteTask(Tasktask) { if(task.IsCompleted) returnfalse; if(task.Status==TaskStatus.WaitingToRun){ task.Execute(); if(task.WaitOnChildren()) task.Wait(); returntrue; } returnfalse; } protectedabstractboolTryExecuteTaskInline(Tasktask,booltaskWasPreviouslyQueued); internalboolRunInline(Tasktask,booltaskWasPreviouslyQueued) { if(!TryExecuteTaskInline(task,taskWasPreviouslyQueued)) returnfalse; if(!task.IsCompleted) thrownewInvalidOperationException("TheTryExecuteTaskInlinecalltotheunderlyingschedulersucceeded,butthetaskbodywasnotinvoked"); returntrue; } internalstaticUnobservedTaskExceptionEventArgsFireUnobservedEvent(Tasktask,AggregateExceptione) { UnobservedTaskExceptionEventArgsargs=newUnobservedTaskExceptionEventArgs(e); EventHandler<UnobservedTaskExceptionEventArgs>temp=UnobservedTaskException; if(temp==null) returnargs; temp(task,args); returnargs; } } } #endif