wall-clock-synchronizer.h

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2008 University of Washington
 *
 * 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
 */

#ifndef WALL_CLOCK_CLOCK_SYNCHRONIZER_H
#define WALL_CLOCK_CLOCK_SYNCHRONIZER_H

#include "system-condition.h"
#include "synchronizer.h"

namespace ns3 {

class WallClockSynchronizer : public Synchronizer
{
public:
  static TypeId GetTypeId (void);

  WallClockSynchronizer ();
  virtual ~WallClockSynchronizer ();

  static const uint64_t US_PER_NS = (uint64_t)1000;
  static const uint64_t US_PER_SEC = (uint64_t)1000000;
  static const uint64_t NS_PER_SEC = (uint64_t)1000000000;

protected:
  bool SpinWait (uint64_t ns);
  bool SleepWait (uint64_t ns);

  // Inherited from Synchronizer
  virtual void DoSetOrigin (uint64_t ns);
  virtual bool DoRealtime (void);
  virtual uint64_t DoGetCurrentRealtime (void);
  virtual bool DoSynchronize (uint64_t nsCurrent, uint64_t nsDelay);
  virtual void DoSignal (void);
  virtual void DoSetCondition (bool cond);
  virtual int64_t DoGetDrift (uint64_t ns);
  virtual void DoEventStart (void);
  virtual uint64_t DoEventEnd (void);

  uint64_t DriftCorrect (uint64_t nsNow, uint64_t nsDelay);

  uint64_t GetRealtime (void);
  uint64_t GetNormalizedRealtime (void);

  void NsToTimeval (int64_t ns, struct timeval *tv);
  uint64_t TimevalToNs (struct timeval *tv);

  void TimevalAdd (
    struct timeval *tv1, 
    struct timeval *tv2,
    struct timeval *result);

  uint64_t m_jiffy;
  uint64_t m_nsEventStart;

  SystemCondition m_condition;
};

} // namespace ns3

#endif /* WALL_CLOCK_SYNCHRONIZER_H */