CountdownEvent.cs System::Threading::CountdownEvent System System::Threading //CountdownEvent.cs // //Authors: //MarekSafar<marek.safar@gmail.com> // //Copyright(c)2008Jérémie"Garuma"Laval //Copyright2011XamarinInc(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 namespaceSystem.Threading { [System.Diagnostics.DebuggerDisplayAttribute("InitialCount={InitialCount},CurrentCount={CurrentCount}")] publicclassCountdownEvent:IDisposable { intinitialCount; intinitial; ManualResetEventSlimevt; publicCountdownEvent(intinitialCount) { if(initialCount<0) thrownewArgumentOutOfRangeException("initialCount"); evt=newManualResetEventSlim(initialCount==0); this.initial=this.initialCount=initialCount; } publicintCurrentCount{ get{ returninitialCount; } } publicintInitialCount{ get{ returninitial; } } publicboolIsSet{ get{ returninitialCount==0; } } publicWaitHandleWaitHandle{ get{ returnevt.WaitHandle; } } publicboolSignal() { returnSignal(1); } publicboolSignal(intsignalCount) { if(signalCount<=0) thrownewArgumentOutOfRangeException("signalCount"); CheckDisposed(); intnewValue; if(!ApplyOperation(-signalCount,outnewValue)) thrownewInvalidOperationException("Theeventisalreadyset"); if(newValue==0){ evt.Set(); returntrue; } returnfalse; } publicvoidAddCount() { AddCount(1); } publicvoidAddCount(intsignalCount) { if(!TryAddCount(signalCount)) thrownewInvalidOperationException("Theeventisalreadysignaledandcannotbeincremented"); } publicboolTryAddCount() { returnTryAddCount(1); } publicboolTryAddCount(intsignalCount) { if(signalCount<=0) thrownewArgumentOutOfRangeException("signalCount"); CheckDisposed(); inttemp; returnApplyOperation(signalCount,outtemp); } boolApplyOperation(intnum,outintnewValue) { intoldCount; do{ oldCount=initialCount; if(oldCount==0){ newValue=0; returnfalse; } newValue=oldCount+num; if(newValue<0) returnfalse; }while(Interlocked.CompareExchange(refinitialCount,newValue,oldCount)!=oldCount); returntrue; } publicvoidWait() { evt.Wait(); } publicvoidWait(CancellationTokencancellationToken) { evt.Wait(cancellationToken); } publicboolWait(intmillisecondsTimeout) { returnevt.Wait(millisecondsTimeout); } publicboolWait(TimeSpantimeout) { returnevt.Wait(timeout); } publicboolWait(intmillisecondsTimeout,CancellationTokencancellationToken) { returnevt.Wait(millisecondsTimeout,cancellationToken); } publicboolWait(TimeSpantimeout,CancellationTokencancellationToken) { returnevt.Wait(timeout,cancellationToken); } publicvoidReset() { Reset(initial); } publicvoidReset(intcount) { if(count<0) thrownewArgumentOutOfRangeException("count"); CheckDisposed(); initialCount=initial=count; if(count==0) evt.Set(); else evt.Reset(); } publicvoidDispose() { Dispose(true); } protectedvirtualvoidDispose(booldisposing) { if(disposing) evt.Dispose(); } voidCheckDisposed() { if(evt.disposed.Value) thrownewObjectDisposedException("CountdownEvent"); } } } #endif