/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            threadsafe_queue_priority.cc
 *
 *  Tue Sep 27 14:01:24 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 "threadsafe_queue_priority.h"

#include "util.h"

ThreadSafeQueuePriority::ThreadSafeQueuePriority(unsigned int number) 
  //  : ThreadSafeQueue< Frame* >()
{
  framenumber = number;
}

ThreadSafeQueuePriority::~ThreadSafeQueuePriority()
{
}

void ThreadSafeQueuePriority::push(Frame *frame)
{
  // Lock mutex
  //  pthread_mutex_lock( &mutex );
  mutex.lock();
  queue.push(frame);
  //  pthread_mutex_unlock( &mutex );
  mutex.unlock();
  // Unlock mutex

  //  sem_post(&semaphore);
  semaphore.post();
}

Frame *ThreadSafeQueuePriority::pop()
{
  semaphore.wait();
  //  sem_wait(&semaphore);

  Frame *tmpframe = NULL;
  Frame *frame = NULL;

  while( frame == NULL ) {
    // Lock mutex
    //    pthread_mutex_lock( &mutex );
    mutex.lock();

    tmpframe = queue.top();
    
    if(tmpframe && tmpframe->number == framenumber ) {
      queue.pop();
      frame = tmpframe;
      framenumber++;
    }
    
    //    pthread_mutex_unlock( &mutex );
    mutex.unlock();
    // Unlock mutex

    if(frame == NULL) sleep_0_2_frame();
  }

  return frame;
}

int ThreadSafeQueuePriority::size()
{
  int sz;

  // Lock mutex
  //  pthread_mutex_lock( &mutex );
  mutex.lock();
  sz = queue.size();
  //  pthread_mutex_unlock( &mutex );
  mutex.unlock();
  // Unlock mutex

  return sz;
}