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//
// CancellationToken.cs
//
// Authors:
// Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
// Marek Safar (marek.safar@gmail.com)
//
// Copyright (c) 2009 Jérémie "Garuma" Laval
// Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
//
// 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
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#if NET_4_0
using System;
using System.Threading;
using System.Diagnostics;
namespace System.Threading
{
[DebuggerDisplay ("IsCancellationRequested = {IsCancellationRequested}")]
public struct CancellationToken
{
readonly CancellationTokenSource source;
public CancellationToken (bool canceled)
: this (canceled ? CancellationTokenSource.CanceledSource : null)
{
}
internal CancellationToken (CancellationTokenSource source)
{
this.source = source;
}
public static CancellationToken None {
get {
// simply return new struct value, it's the fastest option
// and we don't have to bother with reseting source
return new CancellationToken ();
}
}
public CancellationTokenRegistration Register (Action callback)
{
return Register (callback, 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 (Action<object> callback, object state, bool useSynchronizationContext)
{
if (callback == null)
throw new ArgumentNullException ("callback");
return Register (() => callback (state), useSynchronizationContext);
}
public void ThrowIfCancellationRequested ()
{
if (source != null && source.IsCancellationRequested)
throw new OperationCanceledException (this);
}
public bool Equals (CancellationToken other)
{
return this.Source == other.Source;
}
public override bool Equals (object other)
{
return (other is CancellationToken) ? Equals ((CancellationToken)other) : false;
}
public override int GetHashCode ()
{
return Source.GetHashCode ();
}
public static bool operator == (CancellationToken left, CancellationToken right)
{
return left.Equals (right);
}
public static bool operator != (CancellationToken left, CancellationToken right)
{
return !left.Equals (right);
}
public bool CanBeCanceled {
get {
return source != null;
}
}
public bool IsCancellationRequested {
get {
return Source.IsCancellationRequested;
}
}
public WaitHandle WaitHandle {
get {
return Source.WaitHandle;
}
}
CancellationTokenSource Source {
get {
return source ?? CancellationTokenSource.NoneSource;
}
}
}
}
#endif
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