src/threadsafe_queue_fifo.h


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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            threadsafe_queue_fifo.h
 *
 *  Tue Sep 27 14:01:10 CEST 2005
 *  Copyright  2005 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of MIaV.
 *
 *  MIaV 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.
 *
 *  MIaV 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 MIaV; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include "config.h"
#ifndef __MIAV_THREADSAFE_QUEUE_FIFO_H__
#define __MIAV_THREADSAFE_QUEUE_FIFO_H__

#include "threadsafe_queue.h"
#include <queue>

template <typename T>
class ThreadSafeQueueFIFO: public ThreadSafeQueue<T> {
public:
  ThreadSafeQueueFIFO() {}
  ~ThreadSafeQueueFIFO() {}

  void push(T t) {
    // Lock mutex
    pthread_mutex_lock( &mutex );
    queue.push(t);
    pthread_mutex_unlock( &mutex );
    // Unlock mutex

    sem_post(&semaphore);
  }

  T pop() {
    sem_wait(&semaphore);
    T t;

    // Lock mutex
    pthread_mutex_lock( &mutex );
    t = queue.front();
    queue.pop();
    pthread_mutex_unlock( &mutex );
    // Unlock mutex

    return t;
  }

  int size() {
    int sz;

    // Lock mutex
    pthread_mutex_lock( &mutex );
    sz = queue.size();
    pthread_mutex_unlock( &mutex );
    // Unlock mutex
    
    return sz;
  }

private:
  std::queue<T> queue;
};

#endif/*__MIAV_THREADSAFE_QUEUE_FIFO_H__*/