dynamic-queue-limits.h

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/*
 * Copyright (c) 2016 Universita' degli Studi di Napoli Federico II
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * 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
 *
 * Authors: Pasquale Imputato <p.imputato@gmail.com>
 *          Stefano Avallone <stefano.avallone@unina.it>
 *
 * This code is a port of the dynamic queue limits library implemented
 * in the Linux kernel by
 * Author: Tom Herbert <therbert@google.com>
 */
 
#ifndef DYNAMIC_QUEUE_LIMITS_H
#define DYNAMIC_QUEUE_LIMITS_H
 
#include "queue-limits.h"
 
#include "ns3/nstime.h"
#include "ns3/traced-value.h"
 
#include <limits.h>
 
namespace ns3
{
 
class DynamicQueueLimits : public QueueLimits
{
  public:
    static TypeId GetTypeId();
 
    DynamicQueueLimits();
    ~DynamicQueueLimits() override;
 
    void Reset() override;
    void Completed(uint32_t count) override;
    int32_t Available() const override;
    void Queued(uint32_t count) override;
 
  private:
    int32_t Posdiff(int32_t a, int32_t b);
 
    // Fields accessed in enqueue path
    uint32_t m_numQueued{0};  
    uint32_t m_adjLimit{0};   
    uint32_t m_lastObjCnt{0}; 
 
    // Fields accessed only by completion path
    TracedValue<uint32_t> m_limit; 
    uint32_t m_numCompleted{0};    
 
    uint32_t m_prevOvlimit{0};    
    uint32_t m_prevNumQueued{0};  
    uint32_t m_prevLastObjCnt{0}; 
 
    uint32_t m_lowestSlack{std::numeric_limits<uint32_t>::max()}; 
    Time m_slackStartTime{Seconds(0)};                            
 
    // Configuration
    uint32_t m_maxLimit;  
    uint32_t m_minLimit;  
    Time m_slackHoldTime; 
};
 
} // namespace ns3
 
#endif /* DYNAMIC_QUEUE_LIMITS_H */