hrtimer.h
#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 TimerBase
//! \brief Base class for timers
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; // GetCurrentTime is a macro in MSVC 6.0
virtual TimerWord TicksPerSecond() =0; // this is not the resolution, just a conversion factor into seconds
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
//! \brief Measure CPU time spent executing instructions of this thread (if supported by OS)
//! \note ThreadUserTimer only works correctly on Windows NT or later desktops and servers.
//! On Unix-based it reports process time. On Windows Phone and Windows Store it reports wall
//! clock time with performance counter precision. On all others it reports wall clock time.
class ThreadUserTimer : public TimerBase
{
public:
ThreadUserTimer(Unit unit = TimerBase::SECONDS, bool stuckAtZero = false) : TimerBase(unit, stuckAtZero) {}
TimerWord GetCurrentTimerValue();
TimerWord TicksPerSecond();
};
//! high resolution timer
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
ThreadUserTimer
Measure CPU time spent executing instructions of this thread (if supported by OS)
Definition: hrtimer.h:48
TimerBase
Base class for timers.
Definition: hrtimer.h:20
CryptoPP
Crypto++ library namespace.
config.h
Library configuration file.
Timer
high resolution timer
Definition: hrtimer.h:57