hrtimer.h

Go to the documentation of this file.

// hrtimer.h - originally written and placed in the public domain by Wei Dai
 
 
#ifndef CRYPTOPP_HRTIMER_H
#define CRYPTOPP_HRTIMER_H
 
#include "config.h"
 
#if !defined(HIGHRES_TIMER_AVAILABLE) || (defined(CRYPTOPP_WIN32_AVAILABLE) && !defined(THREAD_TIMER_AVAILABLE))
#include <time.h>
#endif
 
NAMESPACE_BEGIN(CryptoPP)
 
#ifdef HIGHRES_TIMER_AVAILABLE
        typedef word64 TimerWord;
#else
        typedef clock_t TimerWord;
#endif
 
class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE TimerBase
{
public:
        enum Unit {
                SECONDS = 0,
                MILLISECONDS,
                MICROSECONDS,
                NANOSECONDS
        };
 
        TimerBase(Unit unit, bool stuckAtZero)
                : m_timerUnit(unit), m_stuckAtZero(stuckAtZero), m_started(false)
                , m_start(0), m_last(0) {}
 
        virtual TimerWord GetCurrentTimerValue() =0;
 
        virtual TimerWord TicksPerSecond() =0;
 
        void StartTimer();
 
        double ElapsedTimeAsDouble();
 
        unsigned long ElapsedTime();
 
private:
        double ConvertTo(TimerWord t, Unit unit);
 
        Unit m_timerUnit;       // HPUX workaround: m_unit is a system macro on HPUX
        bool m_stuckAtZero, m_started;
        TimerWord m_start, m_last;
};
 
class ThreadUserTimer : public TimerBase
{
public:
        ThreadUserTimer(Unit unit = TimerBase::SECONDS, bool stuckAtZero = false) : TimerBase(unit, stuckAtZero) {}
        TimerWord GetCurrentTimerValue();
        TimerWord TicksPerSecond();
};
 
class CRYPTOPP_DLL Timer : public TimerBase
{
public:
        Timer(Unit unit = TimerBase::SECONDS, bool stuckAtZero = false) : TimerBase(unit, stuckAtZero) {}
        TimerWord GetCurrentTimerValue();
        TimerWord TicksPerSecond();
};
 
NAMESPACE_END
 
#endif