opensim/OpenSim/Framework/BlockingQueue.cs

/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*     * Redistributions of source code must retain the above copyright
*       notice, this list of conditions and the following disclaimer.
*     * 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.
*     * Neither the name of the OpenSim Project nor the
*       names of its contributors may be used to endorse or promote products
*       derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``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 THE 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
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* 
*/
using System.Collections.Generic;
using System.Threading;

namespace OpenSim.Framework
{
    public class BlockingQueue<T>
    {
        private readonly Queue<T> m_queue = new Queue<T>();
        private readonly object m_queueSync = new object();

        public void Enqueue(T value)
        {
            lock (m_queueSync)
            {
                m_queue.Enqueue(value);
                Monitor.Pulse(m_queueSync);
            }
        }

        public T Dequeue()
        {
            lock (m_queueSync)
            {
                if (m_queue.Count < 1)
                {
                    Monitor.Wait(m_queueSync);
                }

                return m_queue.Dequeue();
            }
        }

        public bool Contains(T item)
        {
            lock (m_queueSync)
            {
                return m_queue.Contains(item);
            }
        }
    }
}