wall-clock-synchronizer.h

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/*
 * 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 "synchronizer.h"
 
#include <condition_variable>
#include <mutex>
 
namespace ns3
{
 
class WallClockSynchronizer : public Synchronizer
{
  public:
    static TypeId GetTypeId();
 
    WallClockSynchronizer();
    ~WallClockSynchronizer() override;
 
    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
    void DoSetOrigin(uint64_t ns) override;
    bool DoRealtime() override;
    uint64_t DoGetCurrentRealtime() override;
    bool DoSynchronize(uint64_t nsCurrent, uint64_t nsDelay) override;
    void DoSignal() override;
    void DoSetCondition(bool cond) override;
    int64_t DoGetDrift(uint64_t ns) override;
    void DoEventStart() override;
    uint64_t DoEventEnd() override;
 
    uint64_t DriftCorrect(uint64_t nsNow, uint64_t nsDelay);
 
    uint64_t GetRealtime();
    uint64_t GetNormalizedRealtime();
 
    uint64_t m_jiffy;
    uint64_t m_nsEventStart;
 
    std::condition_variable m_conditionVariable;
    std::mutex m_mutex;
    bool m_condition;
};
 
} // namespace ns3
 
#endif /* WALL_CLOCK_SYNCHRONIZER_H */