2 /* -----------------------------------------------------------------------
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3 * <copyright file="AsyncManualResetEvent.cs" company="GRNet">
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5 * Copyright 2011-2012 GRNET S.A. All rights reserved.
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7 * Redistribution and use in source and binary forms, with or
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8 * without modification, are permitted provided that the following
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9 * conditions are met:
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11 * 1. Redistributions of source code must retain the above
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12 * copyright notice, this list of conditions and the following
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15 * 2. Redistributions in binary form must reproduce the above
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16 * copyright notice, this list of conditions and the following
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17 * disclaimer in the documentation and/or other materials
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18 * provided with the distribution.
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21 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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22 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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23 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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25 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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28 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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31 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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32 * POSSIBILITY OF SUCH DAMAGE.
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34 * The views and conclusions contained in the software and
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35 * documentation are those of the authors and should not be
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36 * interpreted as representing official policies, either expressed
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37 * or implied, of GRNET S.A.
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39 * -----------------------------------------------------------------------
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42 using System.Threading;
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43 using System.Threading.Tasks;
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45 namespace Pithos.Core.Agents
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48 using System.Collections.Generic;
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53 /// TODO: Update summary.
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55 public class AsyncManualResetEvent
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57 private volatile TaskCompletionSource<bool> _tcs;
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59 public AsyncManualResetEvent()
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61 _tcs = new TaskCompletionSource<bool>();
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64 public AsyncManualResetEvent(bool signalled)
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66 _tcs = new TaskCompletionSource<bool>();
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68 _tcs.SetResult(true);
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70 public Task WaitAsync() { return _tcs.Task; }
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80 Task.Factory.StartNew(s => ((TaskCompletionSource<bool>)s).TrySetResult(true),
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81 tcs, CancellationToken.None, TaskCreationOptions.PreferFairness, TaskScheduler.Default);
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90 if (!tcs.Task.IsCompleted ||
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91 Interlocked.CompareExchange(ref _tcs, new TaskCompletionSource<bool>(), tcs) == tcs)
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