Clock.ih

/**
 *  This program 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.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 **/
 
/**
 * @file Clock.ih
 * @author Jacques-Olivier Lachaud (\c jacques-olivier.lachaud@univ-savoie.fr )
 * Laboratory of Mathematics (CNRS, UMR 5807), University of Savoie, France
 *
 * @date 2009/12/11
 *
 * Implementation of methods defined in Clock.h
 *
 * This file is part of the DGtal library (backported from Imagene)
 */
 
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
 
///////////////////////////////////////////////////////////////////////////////
// class Clock
//////////////////////////////////////////////////////////////////////////////
 
/**
 * Constructor.
 */
inline
DGtal::Clock::Clock()
{
}
 
 
//- Starts a clock.
inline
void
DGtal::Clock::startClock()
{
 
#ifdef WIN32
  myFirstTick = clock();
  if (myFirstTick == (clock_t) -1)
    {
      std::cerr << "[Clock::startClock] Error: can't start clock." << std::endl;
    }
#else
#ifdef __MACH__ // OS X does not have clock_gettime, use clock_get_time
  clock_serv_t cclock;
  mach_timespec_t mts;
  host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock);
  clock_get_time(cclock, &mts);
  mach_port_deallocate(mach_task_self(), cclock);
  myTimerStart.tv_sec = mts.tv_sec;
  myTimerStart.tv_nsec = mts.tv_nsec;
#else
  clock_gettime(CLOCK_REALTIME, &myTimerStart);
#endif
#endif
}
 
 
//- @return the time (in ms) since the last 'startClock()' or 'restartClock()'.
inline
double
DGtal::Clock::stopClock() const
{
 
#ifdef WIN32
  clock_t last_tick = clock();
  if (last_tick == (clock_t) -1)
    {
      std::cerr << "[Clock::stopClock] Error: can't stop clock." << std::endl;
    }
  return (double) ((double) 1000.0 * (double)(last_tick - myFirstTick)
     / (double) CLOCKS_PER_SEC);
#else
  struct timespec current;
 
#ifdef __MACH__ // OS X does not have clock_gettime, use clock_get_time
  clock_serv_t cclock;
  mach_timespec_t mts;
  host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock);
  clock_get_time(cclock, &mts);
  mach_port_deallocate(mach_task_self(), cclock);
  current.tv_sec = mts.tv_sec;
  current.tv_nsec = mts.tv_nsec;
#else
  clock_gettime(CLOCK_REALTIME, &current); //Linux gettime
#endif
 
  return (( current.tv_sec - myTimerStart.tv_sec) *1000 +
    ( current.tv_nsec - myTimerStart.tv_nsec)/1000000.0);
#endif
 
}
 
inline
double
DGtal::Clock::restartClock()
{
 
#ifdef WIN32
  clock_t last_tick = clock();
  if (last_tick == (clock_t) -1)
    {
      std::cerr << "[Clock::stopClock] Error: can't restart clock." << std::endl;
    }
  const double delta = ((double) 1000.0 * (double)(last_tick - myFirstTick)
     / (double) CLOCKS_PER_SEC);
  myFirstTick = last_tick;
  return delta;
#else
  struct timespec current;
 
#ifdef __MACH__ // OS X does not have clock_gettime, use clock_get_time
  clock_serv_t cclock;
  mach_timespec_t mts;
  host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock);
  clock_get_time(cclock, &mts);
  mach_port_deallocate(mach_task_self(), cclock);
  current.tv_sec = mts.tv_sec;
  current.tv_nsec = mts.tv_nsec;
#else
  clock_gettime(CLOCK_REALTIME, &current); //Linux gettime
#endif
 
  const double delta = (( current.tv_sec - myTimerStart.tv_sec) *1000 +
    ( current.tv_nsec - myTimerStart.tv_nsec)/1000000.0);
  myTimerStart.tv_sec = current.tv_sec;
  myTimerStart.tv_nsec = current.tv_nsec;
  return delta;
#endif
 
}
 
 
/**
 * Destructor.
 */
inline
DGtal::Clock::~Clock()
{
}
 
 
 
///////////////////////////////////////////////////////////////////////////////
// Interface - public :
 
/**
 * Writes/Displays the object on an output stream.
 * @param out the output stream where the object is written.
 */
inline
void
DGtal::Clock::selfDisplay( std::ostream & out ) const
{
  out << "[Clock]";
}
 
/**
 * Checks the validity/consistency of the object.
 * @return 'true' if the object is valid, 'false' otherwise.
 */
inline
bool
DGtal::Clock::isValid() const
{
  return true;
}