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Bug #9270 » Timer.hpp

Steven Köhler, 11/02/2021 02:54 PM

 

#pragma once

#if defined (_MSC_VER)
# include <windows.h>
# undef min
# undef max
#elif defined (__GNUC__)
# include <chrono>
# include <time.h>
#endif

namespace sk::tools
{
#if defined (_MSC_VER)

struct Timer
{
//!
//! A constructor
//!
Timer()
{
QueryPerformanceFrequency(&_frequence);
_overhead = getOverhead();
}

//!
//! Starts the timer
//!
void start()
{
QueryPerformanceCounter(&_start);
}

//!
//! Stops the timer
//!
void stop()
{
QueryPerformanceCounter(&_stop);
}

//!
//! Returns elapsed time in milliseconds (ms)
//!
//! \returns the elapsed time in milliseconds (ms)
//!
double elapsed()
{
return (_stop.QuadPart - _start.QuadPart - _overhead) * 1000.0 / _frequence.QuadPart;
}

private:

//!
//! Returns the overhead of the timer in ticks
//!
//! \returns the overhead of the timer in ticks
//!
LONGLONG getOverhead()
{
start();
stop();
return _stop.QuadPart - _start.QuadPart;
}

// members
LARGE_INTEGER _start;
LARGE_INTEGER _stop;
LARGE_INTEGER _frequence;
LONGLONG _overhead;
};

#elif defined (__GNUC__)

struct Timer
{
//!
//! A constructor
//!
Timer() = default;

//!
//! Starts the timer
//!
void start()
{
clock_gettime(CLOCK_MONOTONIC, &_start);
}

//!
//! Stops the timer
//!
void stop()
{
clock_gettime(CLOCK_MONOTONIC, &_stop);
}

//!
//! Returns elapsed time in milliseconds (ms)
//!
//! \returns the elapsed time in milliseconds (ms)
//!
double elapsed()
{
std::chrono::nanoseconds start = std::chrono::seconds{ _start.tv_sec } + std::chrono::nanoseconds{ _start.tv_nsec };
std::chrono::nanoseconds stop = std::chrono::seconds{ _stop.tv_sec } + std::chrono::nanoseconds{ _stop.tv_nsec };
auto d = stop - start;
return d.count() / 1000000.0;
}

private:

// members
struct timespec _start;
struct timespec _stop;
};

#endif
}
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