/usr/include/mapnik/timer.hpp is in libmapnik-dev 3.0.12+ds-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2015 Artem Pavlenko
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#ifndef MAPNIK_TIMER_HPP
#define MAPNIK_TIMER_HPP
// stl
#include <cstdlib>
#include <string>
#include <sstream>
#include <iomanip>
#include <ctime>
#ifdef _WINDOWS
#define NOMINMAX
#include <windows.h>
#else
#include <sys/time.h> // for gettimeofday() on unix
#include <sys/resource.h>
#endif
namespace mapnik {
// Try to return the time now
inline double time_now()
{
#ifdef _WINDOWS
LARGE_INTEGER t, f;
QueryPerformanceCounter(&t);
QueryPerformanceFrequency(&f);
return double(t.QuadPart) / double(f.QuadPart);
#else
struct timeval t;
struct timezone tzp;
gettimeofday(&t, &tzp);
return t.tv_sec + t.tv_usec * 1e-6;
#endif
}
// Measure times in both wall clock time and CPU times. Results are returned in milliseconds.
class timer
{
public:
timer()
{
restart();
}
virtual ~timer()
{
}
void restart()
{
stopped_ = false;
wall_clock_start_ = time_now();
cpu_start_ = clock();
}
virtual void stop() const
{
stopped_ = true;
cpu_end_ = clock();
wall_clock_end_ = time_now();
}
double cpu_elapsed() const
{
// return elapsed CPU time in ms
if (! stopped_)
{
stop();
}
return ((double) (cpu_end_ - cpu_start_)) / CLOCKS_PER_SEC * 1000.0;
}
double wall_clock_elapsed() const
{
// return elapsed wall clock time in ms
if (! stopped_)
{
stop();
}
return (wall_clock_end_ - wall_clock_start_) * 1000.0;
}
protected:
mutable double wall_clock_start_, wall_clock_end_;
mutable clock_t cpu_start_, cpu_end_;
mutable bool stopped_;
};
// A progress_timer behaves like a timer except that the destructor displays
// an elapsed time message at an appropriate place in an appropriate form.
class progress_timer : public timer
{
public:
progress_timer(std::ostream & os, std::string const& base_message)
: os_(os),
base_message_(base_message)
{}
~progress_timer()
{
if (! stopped_)
{
stop();
}
}
void stop() const
{
timer::stop();
try
{
std::ostringstream s;
s.precision(2);
s << std::fixed;
s << wall_clock_elapsed() << "ms (cpu " << cpu_elapsed() << "ms)";
s << std::setw(30 - (int)s.tellp()) << std::right << "| " << base_message_ << "\n";
os_ << s.str();
}
catch (...) {} // eat any exceptions
}
void discard()
{
stopped_ = true;
}
private:
std::ostream & os_;
std::string base_message_;
};
}
#endif // MAPNIK_TIMER_HPP
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