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// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#ifndef PERF_H_83947184145342652456
#define PERF_H_83947184145342652456
#include <chrono>
#include "deprecate.h"
#include "scope_guard.h"
#include <iostream>
//############# two macros for quick performance measurements ###############
#define PERF_START zen::PerfTimer perfTest;
#define PERF_STOP perfTest.showResult();
//###########################################################################
namespace zen
{
class PerfTimer
{
public:
ZEN_DEPRECATE PerfTimer() {}
~PerfTimer() { if (!resultShown_) showResult(); }
void pause()
{
if (!paused_)
{
paused_ = true;
elapsedUntilPause_ += std::chrono::steady_clock::now() - startTime_; //ignore potential ::QueryPerformanceCounter() wrap-around!
}
}
void resume()
{
if (paused_)
{
paused_ = false;
startTime_ = std::chrono::steady_clock::now();
}
}
void restart()
{
paused_ = false;
startTime_ = std::chrono::steady_clock::now();
elapsedUntilPause_ = std::chrono::nanoseconds::zero();
}
int64_t timeMs() const
{
auto elapsedTotal = elapsedUntilPause_;
if (!paused_)
elapsedTotal += std::chrono::steady_clock::now() - startTime_;
return std::chrono::duration_cast<std::chrono::milliseconds>(elapsedTotal).count();
}
void showResult()
{
const bool wasRunning = !paused_;
if (wasRunning) pause(); //don't include call to MessageBox()!
ZEN_ON_SCOPE_EXIT(if (wasRunning) resume());
std::clog << "Perf: duration: " << timeMs() << " ms\n";
resultShown_ = true;
}
private:
bool resultShown_ = false;
bool paused_ = false;
std::chrono::steady_clock::time_point startTime_ = std::chrono::steady_clock::now(); //uses ::QueryPerformanceCounter()
std::chrono::nanoseconds elapsedUntilPause_{}; //std::chrono::duration is uninitialized by default! WTF! When will this stupidity end???
};
}
#endif //PERF_H_83947184145342652456
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