CRNTimer.cpp

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/* Copyright 2009-2014 INSA Lyon, CoReNum
 * 
 * This file is part of libcrn.
 * 
 * libcrn is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * libcrn is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with libcrn.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * file: CRNTimer.cpp
 * \author Yann LEYDIER
 */

#include <CRNUtils/CRNTimer.h>
#include <CRNi18n.h>
#ifdef _MSC_VER
#   include <windows.h>
#else
#   include <sys/time.h>
#endif
using namespace crn;

std::map<String, Timer::StopWatch> Timer::stopwatches;

double Timer::getTime()
{
#ifdef _MSC_VER
    _SYSTEMTIME tim;
    GetSystemTime(&tim);
    return ((tim.wDay * 24.0 + tim.wHour) * 60.0 + tim.wMinute) * 60.0 + 
        tim.wSecond + (tim.wMilliseconds / 1000.0); // XXX does not work if the month changes!
#else
    timeval tim;
    gettimeofday(&tim, nullptr);
    return double(tim.tv_sec) + (double(tim.tv_usec) / 1000000.0);
#endif
}

void Timer::Start(const String &timername)
{
    StopWatch &sw = stopwatches[timername];
    sw.stops.clear();
    sw.t0 = getTime(); // store time as late as possible
}

double Timer::Split(const String &timername, const String &splitname)
{
    double t = getTime(); // store time as soon as possible
    double pt;
    StopWatch &sw = stopwatches[timername];
    if (sw.stops.size() > 0)
        pt = sw.stops.back().second;
    else
        pt = sw.t0;
    sw.stops.push_back(std::make_pair(splitname, t));
    return t - pt;
}

String Timer::Stats(const String &timername)
{
    StopWatch &sw = stopwatches[timername];
    if (sw.stops.size() == 0)
        return _("Unused stopwatch.");
    int prec = String::Precision();
    String::Precision() = 6;
    String s(_("Stopwatch: "));
    s += timername + U"\n";
    s += _("Total time: ");
    double pt = sw.t0;
    double tot = sw.stops.back().second - pt;
    s += tot;
    s += U" s";
    for (StopTime &st : sw.stops)
    {
        s += U"\n" + st.first + U": ";
        double thistime = st.second - pt;
        String::Precision() = 6;
        s += thistime;
        s += U" s\t(";
        String::Precision() = 4;
        s += (thistime * 100.0) / tot;
        s += U"%)";
        pt = st.second;
    }
    String::Precision() = prec;
    return s;
}

void Timer::Destroy(const String &timername)
{
    stopwatches.erase(timername);
}

static const String CRN_TIMER_UNIQUE_NAME(U"ceci n'est pas un nom"); 
void Timer::Start()
{
    Start(CRN_TIMER_UNIQUE_NAME);
}

double Timer::Stop()
{
    double t = Split(CRN_TIMER_UNIQUE_NAME, CRN_TIMER_UNIQUE_NAME);
    Destroy(CRN_TIMER_UNIQUE_NAME);
    return t;
}