portable_timer.hh

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//=====================================================
// File   :  portable_timer.hh
// Author :  L. Plagne <laurent.plagne@edf.fr)> from boost lib
// Copyright (C) EDF R&D,  lun sep 30 14:23:17 CEST 2002
//=====================================================
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// 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, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
//
//  simple_time extracted from the boost library
//
#ifndef _PORTABLE_TIMER_HH
#define _PORTABLE_TIMER_HH
 
#include <ctime>
#include <cstdlib>
 
#include <time.h>
 
 
#define USEC_IN_SEC 1000000
 
 
//  timer  -------------------------------------------------------------------//
 
//  A timer object measures CPU time.
#if defined(_MSC_VER)
 
#define NOMINMAX
#include <windows.h>
 
/*#ifndef hr_timer
#include "hr_time.h"
#define hr_timer
#endif*/
 
 class Portable_Timer
 {
  public:
 
   typedef struct {
    LARGE_INTEGER start;
    LARGE_INTEGER stop;
   } stopWatch;
 
 
   Portable_Timer()
   {
         startVal.QuadPart = 0;
         stopVal.QuadPart = 0;
         QueryPerformanceFrequency(&frequency);
   }
 
   void start() { QueryPerformanceCounter(&startVal); }
 
   void stop() { QueryPerformanceCounter(&stopVal); }
 
   double elapsed() {
         LARGE_INTEGER time;
     time.QuadPart = stopVal.QuadPart - startVal.QuadPart;
     return LIToSecs(time);
   }
 
   double user_time() { return elapsed(); }
 
 
 private:
 
   double LIToSecs(LARGE_INTEGER& L) {
     return ((double)L.QuadPart /(double)frequency.QuadPart) ;
   }
 
   LARGE_INTEGER startVal;
   LARGE_INTEGER stopVal;
   LARGE_INTEGER frequency;
 
 
 }; // Portable_Timer
 
#elif defined(__APPLE__)
#include <CoreServices/CoreServices.h>
#include <mach/mach_time.h>
 
 
class Portable_Timer
{
 public:
 
  Portable_Timer()
  {
  }
 
  void start()
  {
    m_start_time = double(mach_absolute_time())*1e-9;;
 
  }
 
  void stop()
  {
    m_stop_time = double(mach_absolute_time())*1e-9;;
 
  }
 
  double elapsed()
  {
    return  user_time();
  }
 
  double user_time()
  {
    return m_stop_time - m_start_time;
  }
 
 
private:
 
  double m_stop_time, m_start_time;
 
}; // Portable_Timer (Apple)
 
#else
 
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
#include <sys/times.h>
 
class Portable_Timer
{
 public:
 
  Portable_Timer()
  {
    m_clkid = BtlConfig::Instance.realclock ? CLOCK_REALTIME : CLOCK_PROCESS_CPUTIME_ID;
  }
 
  Portable_Timer(int clkid) : m_clkid(clkid)
  {}
 
  void start()
  {
    timespec ts;
    clock_gettime(m_clkid, &ts);
    m_start_time = double(ts.tv_sec) + 1e-9 * double(ts.tv_nsec);
 
  }
 
  void stop()
  {
    timespec ts;
    clock_gettime(m_clkid, &ts);
    m_stop_time = double(ts.tv_sec) + 1e-9 * double(ts.tv_nsec);
 
  }
 
  double elapsed()
  {
    return  user_time();
  }
 
  double user_time()
  {
    return m_stop_time - m_start_time;
  }
 
 
private:
 
  int m_clkid;
  double m_stop_time, m_start_time;
 
}; // Portable_Timer (Linux)
 
#endif
 
#endif  // PORTABLE_TIMER_HPP