143 lines
3.8 KiB
C#
143 lines
3.8 KiB
C#
//
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// CancellationToken.cs
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//
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// Authors:
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// Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
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// Marek Safar (marek.safar@gmail.com)
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//
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// Copyright (c) 2009 Jérémie "Garuma" Laval
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// Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#if NET_4_0
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using System;
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using System.Threading;
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using System.Diagnostics;
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namespace System.Threading
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{
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[DebuggerDisplay ("IsCancellationRequested = {IsCancellationRequested}")]
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public struct CancellationToken
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{
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readonly CancellationTokenSource source;
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public CancellationToken (bool canceled)
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: this (canceled ? CancellationTokenSource.CanceledSource : null)
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{
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}
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internal CancellationToken (CancellationTokenSource source)
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{
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this.source = source;
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}
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public static CancellationToken None {
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get {
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// simply return new struct value, it's the fastest option
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// and we don't have to bother with reseting source
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return new CancellationToken ();
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}
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}
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public CancellationTokenRegistration Register (Action callback)
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{
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return Register (callback, false);
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}
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public CancellationTokenRegistration Register (Action callback, bool useSynchronizationContext)
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{
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if (callback == null)
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throw new ArgumentNullException ("callback");
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return Source.Register (callback, useSynchronizationContext);
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}
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public CancellationTokenRegistration Register (Action<object> callback, object state)
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{
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return Register (callback, state, false);
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}
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public CancellationTokenRegistration Register (Action<object> callback, object state, bool useSynchronizationContext)
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{
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if (callback == null)
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throw new ArgumentNullException ("callback");
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return Register (() => callback (state), useSynchronizationContext);
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}
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public void ThrowIfCancellationRequested ()
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{
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if (source != null && source.IsCancellationRequested)
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throw new OperationCanceledException (this);
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}
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public bool Equals (CancellationToken other)
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{
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return this.Source == other.Source;
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}
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public override bool Equals (object other)
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{
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return (other is CancellationToken) ? Equals ((CancellationToken)other) : false;
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}
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public override int GetHashCode ()
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{
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return Source.GetHashCode ();
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}
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public static bool operator == (CancellationToken left, CancellationToken right)
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{
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return left.Equals (right);
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}
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public static bool operator != (CancellationToken left, CancellationToken right)
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{
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return !left.Equals (right);
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}
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public bool CanBeCanceled {
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get {
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return source != null;
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}
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}
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public bool IsCancellationRequested {
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get {
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return Source.IsCancellationRequested;
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}
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}
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public WaitHandle WaitHandle {
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get {
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return Source.WaitHandle;
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}
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}
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CancellationTokenSource Source {
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get {
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return source ?? CancellationTokenSource.NoneSource;
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}
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}
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}
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}
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#endif
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