-#if NET_4_0 || BOOTSTRAP_NET_4_0
-//
+//
// CancellationToken.cs
-//
+//
// Author:
// Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
-//
+//
// Copyright (c) 2009 Jérémie "Garuma" Laval
-//
+//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
-//
+//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
-//
+//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
using System;
using System.Threading;
-using System.Collections.Generic;
+#if NET_4_0 || MOBILE
namespace System.Threading
{
+ [System.Diagnostics.DebuggerDisplay ("IsCancellationRequested = {IsCancellationRequested}")]
public struct CancellationToken
{
+ bool canBeCanceled;
+ bool initialized;
+ CancellationTokenSource source;
+
public CancellationToken (bool canceled)
+ : this ()
{
- // dummy, this is actually set by CancellationTokenSource when the token is created
- Source = null;
+ initialized = true;
+ canBeCanceled = canceled;
+ // This is correctly set later if token originates from a Source
+ source = canceled ? CancellationTokenSource.CanceledSource : CancellationTokenSource.NoneSource;
+ }
+
+ public static CancellationToken None {
+ get {
+ return CancellationTokenSource.NoneSource.Token;
+ }
}
-
+
public CancellationTokenRegistration Register (Action callback)
{
return Register (callback, false);
}
-
- public CancellationTokenRegistration Register (ICancelableOperation cancelable)
- {
- return Register (cancelable, false);
- }
-
+
public CancellationTokenRegistration Register (Action callback, bool useSynchronizationContext)
{
if (callback == null)
throw new ArgumentNullException ("callback");
-
+
return Source.Register (callback, useSynchronizationContext);
}
-
+
public CancellationTokenRegistration Register (Action<object> callback, object state)
{
return Register (callback, state, false);
}
-
- public CancellationTokenRegistration Register (ICancelableOperation cancelable, bool useSynchronizationContext)
- {
- if (cancelable == null)
- throw new ArgumentNullException ("cancelable");
-
- return Register (() => cancelable.Cancel (), useSynchronizationContext);
- }
-
+
public CancellationTokenRegistration Register (Action<object> callback, object state, bool useSynchronizationContext)
{
if (callback == null)
throw new ArgumentNullException ("callback");
-
+
return Register (() => callback (state), useSynchronizationContext);
}
+ public void ThrowIfCancellationRequested ()
+ {
+ if (initialized && Source.IsCancellationRequested)
+ throw new OperationCanceledException (this);
+ }
+
public bool Equals (CancellationToken other)
{
return this.Source == other.Source;
}
-
- public override bool Equals (object obj)
+
+ public override bool Equals (object other)
{
- return (obj is CancellationToken) ? Equals ((CancellationToken)obj) : false;
+ return (other is CancellationToken) ? Equals ((CancellationToken)other) : false;
}
-
+
public override int GetHashCode ()
{
return Source.GetHashCode ();
}
-
- public static bool operator == (CancellationToken lhs, CancellationToken rhs)
+
+ public static bool operator == (CancellationToken left, CancellationToken right)
{
- return lhs.Equals (rhs);
+ return left.Equals (right);
}
-
- public static bool operator != (CancellationToken lhs, CancellationToken rhs)
+
+ public static bool operator != (CancellationToken left, CancellationToken right)
{
- return !lhs.Equals (rhs);
+ return !left.Equals (right);
}
-
+
public bool CanBeCanceled {
get {
- return true;
+ return canBeCanceled;
}
}
-
+
public bool IsCancellationRequested {
get {
- return Source.IsCancellationRequested;
+ return initialized && Source.IsCancellationRequested;
}
}
-
+
public WaitHandle WaitHandle {
get {
return Source.WaitHandle;
}
}
-
+
internal CancellationTokenSource Source {
- get;
- set;
+ get {
+ if (!initialized)
+ CorrectlyInitialize ();
+ return source;
+ }
+ set {
+ source = value;
+ }
+ }
+
+ void CorrectlyInitialize ()
+ {
+ Source = CancellationTokenSource.NoneSource;
+ initialized = true;
}
}
}