SynchronizedQueue.h

Go to the documentation of this file.

/* Copyright (C) 2008 by Marc Maurer <uwog@uwog.net>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#ifndef __SYNCHRONIZED_QUEUE__
#define __SYNCHRONIZED_QUEUE__

#include <deque>
#include <boost/bind.hpp>
#include <boost/function.hpp>
#include <sync/xp/lock.h>
#include <sync/xp/Synchronizer.h>

class EmptyQueueException {};

template <typename T>
class SynchronizedQueue : public Synchronizer, public boost::noncopyable
{
public:
    SynchronizedQueue(boost::function<void (SynchronizedQueue&)> sig)
        : Synchronizer(boost::bind(&SynchronizedQueue::_signal, this)),
        m_mutex(),
        m_queue(),
        m_sig(sig)
    {}

    void push(T t)
    {
        abicollab::scoped_lock lock(m_mutex);
        m_queue.push_back( t );
        Synchronizer::signal();
    }

    T pop()
    {
        if (m_queue.size() == 0)
            throw EmptyQueueException();
        abicollab::scoped_lock lock(m_mutex);
        T t = m_queue.front();
        m_queue.pop_front();
        return t;
    }

    bool peek()
    {
        return m_queue.size() > 0;
    }

private:
    void _signal()
    {
        m_sig(*this);
    }

    abicollab::mutex m_mutex;
    std::deque< T > m_queue;
    boost::function<void (SynchronizedQueue&)> m_sig;
};

#endif /* __SYNCHRONIZED_QUEUE__ */