#region
/* -----------------------------------------------------------------------
*
*
* Copyright 2011-2012 GRNET S.A. All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
*
* THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and
* documentation are those of the authors and should not be
* interpreted as representing official policies, either expressed
* or implied, of GRNET S.A.
*
* -----------------------------------------------------------------------
*/
#endregion
using System.Threading;
using System.Threading.Tasks;
namespace Pithos.Core.Agents
{
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
///
/// TODO: Update summary.
///
public class AsyncManualResetEvent
{
private volatile TaskCompletionSource _tcs;
public AsyncManualResetEvent()
{
_tcs = new TaskCompletionSource();
}
public AsyncManualResetEvent(bool signalled)
{
_tcs = new TaskCompletionSource();
if (signalled)
_tcs.SetResult(true);
}
public Task WaitAsync() { return _tcs.Task; }
public void Wait()
{
_tcs.Task.Wait();
}
public void Set()
{
var tcs = _tcs;
Task.Factory.StartNew(s => ((TaskCompletionSource)s).TrySetResult(true),
tcs, CancellationToken.None, TaskCreationOptions.PreferFairness, TaskScheduler.Default);
tcs.Task.Wait();
}
public void Reset()
{
while (true)
{
var tcs = _tcs;
if (!tcs.Task.IsCompleted)
return;
#pragma warning disable 420
if (Interlocked.CompareExchange(ref _tcs, new TaskCompletionSource(), tcs) == tcs)
#pragma warning restore 420
return;
}
}
}
}