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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 "deprecate.h"
#include "tick_count.h"
#include "scope_guard.h"
#ifdef ZEN_WIN
#include <sstream>
#else
#include <iostream>
#endif
//############# two macros for quick performance measurements ###############
#define PERF_START zen::PerfTimer perfTest;
#define PERF_STOP perfTest.showResult();
//###########################################################################
namespace zen
{
class PerfTimer
{
public:
class TimerError {};
ZEN_DEPRECATE
PerfTimer() : startTime(getTicksNow()) //throw TimerError
{
//std::clock() - "counts CPU time in Linux GCC and wall time in VC++" - WTF!???
if (ticksPerSec_ == 0)
throw TimerError();
}
~PerfTimer() { if (!resultShown) try { showResult(); } catch (TimerError&) { assert(false); } }
void pause()
{
if (!paused)
{
paused = true;
elapsedUntilPause += dist(startTime, getTicksNow());
}
}
void resume()
{
if (paused)
{
paused = false;
startTime = getTicksNow();
}
}
void restart()
{
startTime = getTicksNow();
paused = false;
elapsedUntilPause = 0;
}
int64_t timeMs() const
{
int64_t ticksTotal = elapsedUntilPause;
if (!paused)
ticksTotal += dist(startTime, getTicksNow());
return 1000 * ticksTotal / ticksPerSec_;
}
void showResult()
{
const bool wasRunning = !paused;
if (wasRunning) pause(); //don't include call to MessageBox()!
ZEN_ON_SCOPE_EXIT(if (wasRunning) resume());
#ifdef ZEN_WIN
std::wostringstream ss;
ss << timeMs() << L" ms";
::MessageBox(nullptr, ss.str().c_str(), L"Timer", MB_OK);
#else
std::clog << "Perf: duration: " << timeMs() << " ms\n";
#endif
resultShown = true;
}
private:
TickVal getTicksNow() const
{
const TickVal now = getTicks();
if (!now.isValid())
throw TimerError();
return now;
}
const std::int64_t ticksPerSec_ = ticksPerSec(); //return 0 on error
bool resultShown = false;
TickVal startTime;
bool paused = false;
int64_t elapsedUntilPause = 0;
};
}
#endif //PERF_H_83947184145342652456
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