2 // TaskExceptionSlot.cs
5 // Marek Safar <marek.safar@gmail.com>
6 // Jérémie Laval <jeremie dot laval at xamarin dot com>
8 // Copyright (c) 2008 Jérémie "Garuma" Laval
9 // Copyright 2011 Xamarin Inc (http://www.xamarin.com).
11 // Permission is hereby granted, free of charge, to any person obtaining a copy
12 // of this software and associated documentation files (the "Software"), to deal
13 // in the Software without restriction, including without limitation the rights
14 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
15 // copies of the Software, and to permit persons to whom the Software is
16 // furnished to do so, subject to the following conditions:
18 // The above copyright notice and this permission notice shall be included in
19 // all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
24 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
26 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
34 using System.Collections.Concurrent;
35 using System.Runtime.ExceptionServices;
37 namespace System.Threading.Tasks
39 internal class TaskExceptionSlot
41 public volatile bool Observed;
42 public ConcurrentQueue<AggregateException> ChildExceptions;
44 volatile AggregateException exception;
46 volatile ExceptionDispatchInfo dispatchInfo;
50 public TaskExceptionSlot (Task parent)
55 public AggregateException Exception {
61 public void SetException (AggregateException exception)
64 if (dispatchInfo == null) {
66 // Used by task awaiter to rethrow an exception with original call stack, it's
67 // needed for first exception only
69 dispatchInfo = ExceptionDispatchInfo.Capture (exception.InnerException);
72 this.exception = exception;
77 if (Exception != null && !Observed && !TaskScheduler.FireUnobservedEvent (parent, Exception).Observed) {
78 // NET 4.5 changed the default exception behavior for unobserved exceptions. Unobserved exceptions still cause
79 // the UnobservedTaskException event to be raised but the process will not crash by default
81 // .NET allows to configure this using config element ThrowUnobservedTaskExceptions