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using System;
using System.Threading;

namespace Enyim.Collections
{
/// <summary>
/// Implements a non-locking stack.
/// </summary>
/// <typeparam name="TItem"></typeparam>
public class InterlockedStack<TItem>
{
private Node head;

public InterlockedStack()
{
this.head = new Node(default(TItem));
}

public void Push(TItem item)
{
var node = new Node(item);

do { node.Next = this.head.Next; }
while (Interlocked.CompareExchange(ref this.head.Next, node, node.Next) != node.Next);
}

public bool TryPop(out TItem value)
{
value = default(TItem);
Node node;

do
{
node = head.Next;
if (node == null) return false;
}
while (Interlocked.CompareExchange(ref head.Next, node.Next, node) != node);

value = node.Value;

return true;
}

#region [ Node ]

private class Node
{
public readonly TItem Value;
public Node Next;

public Node(TItem value)
{
this.Value = value;
}
}

#endregion
}
}

#region [ License information ]
/* ************************************************************
*
* Copyright (c) 2010 Attila Kiskó, enyim.com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* ************************************************************/
#endregion
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