TaskExceptionSlot.cs

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//
// TaskExceptionSlot.cs
//
// Authors:
//    Marek Safar  <marek.safar@gmail.com>
//    Jérémie Laval <jeremie dot laval at xamarin dot com>
//
// Copyright (c) 2008 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 || UNITY_5_3_OR_NEWER

using System;
using System.Collections.Concurrent;

namespace System.Threading.Tasks
{
    internal class TaskExceptionSlot
    {
        public volatile AggregateException  Exception;
        public volatile bool                Observed;
        public ConcurrentQueue<AggregateException> ChildExceptions;

        Task parent;

        public TaskExceptionSlot (Task parent)
        {
            this.parent = parent;
        }

        ~TaskExceptionSlot ()
        {
            if (Exception != null && !Observed && !TaskScheduler.FireUnobservedEvent (parent, Exception).Observed) {
                // NET 4.5 changed the default exception behavior for unobserved exceptions. Unobserved exceptions still cause
                // the UnobservedTaskException event to be raised but the process will not crash by default
                //
                // .NET allows to configure this using config element ThrowUnobservedTaskExceptions
                //
#if !NET_4_5 && !UNITY_5_3_OR_NEWER
                throw Exception;
#endif
            }
        }
    }
}

#endif