TaskExceptionSlot.cs
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1 //
2 // TaskExceptionSlot.cs
3 //
4 // Authors:
5 // Marek Safar <marek.safar@gmail.com>
6 // Jérémie Laval <jeremie dot laval at xamarin dot com>
7 //
8 // Copyright (c) 2008 Jérémie "Garuma" Laval
9 // Copyright 2011 Xamarin Inc (http://www.xamarin.com).
10 //
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12 // of this software and associated documentation files (the "Software"), to deal
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22 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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30 
31 #if NET_4_0
32 
33 using System;
35 
36 namespace System.Threading.Tasks
37 {
38  internal class TaskExceptionSlot
39  {
40  public volatile AggregateException Exception;
41  public volatile bool Observed;
42  public ConcurrentQueue<AggregateException> ChildExceptions;
43 
44  Task parent;
45 
46  public TaskExceptionSlot (Task parent)
47  {
48  this.parent = parent;
49  }
50 
51  ~TaskExceptionSlot ()
52  {
53  if (Exception != null && !Observed && !TaskScheduler.FireUnobservedEvent (parent, Exception).Observed) {
54  // NET 4.5 changed the default exception behavior for unobserved exceptions. Unobserved exceptions still cause
55  // the UnobservedTaskException event to be raised but the process will not crash by default
56  //
57  // .NET allows to configure this using config element ThrowUnobservedTaskExceptions
58  //
59 #if !NET_4_5
60  throw Exception;
61 #endif
62  }
63  }
64  }
65 }
66 
67 #endif