timing.cpp

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#ifndef _MSC_VER
#  include <itpp/config.h>
#else
#  include <itpp/config_msvc.h>
#endif
 
#ifdef TIME_WITH_SYS_TIME
#  include <sys/time.h>
#  include <ctime>
#else
#  ifdef HAVE_SYS_TIME_H
#    include <sys/time.h>
#  else
#    include <ctime>
#  endif
#endif
 
#include <itpp/base/timing.h>
#include <cstdio>
#include <iostream>
#include <cmath>
 
 
#if defined(_WIN32) && !defined(__CYGWIN__)
#include <windows.h>
 
int gettimeofday(struct timeval* p, void*)
{
  union {
    long long ns100; /* time since 1 Jan 1601 in 100ns units */
    FILETIME ft;
  } _now;
 
  GetSystemTimeAsFileTime(&(_now.ft));
  p->tv_usec = (long)((_now.ns100 / 10LL) % 1000000LL);
  /* time since 1 Jan 1970 */
  p->tv_sec = (long)((_now.ns100 - 116444736000000000LL) / 10000000LL);
  return 0;
}
#endif
 
 
namespace itpp
{

Real_Timer __tic_toc_timer;
 
//----------------------------------------------------------------------------
// class Timer
//----------------------------------------------------------------------------
Timer::Timer()
{
  reset();
}
 
void Timer::start(void)
{
  if (!running) {
    start_time = get_current_time();
    running = true;
  }
}
 
double Timer::stop(void)
{
  if (running) {
    stop_time = get_current_time();
    elapsed_time += stop_time - start_time;
    running = false;
  }
 
  return elapsed_time;
}
 
void Timer::reset(double t)
{
  elapsed_time = t;
  start_time = 0;
  stop_time = 0;
  running = false;
}
 
double Timer::get_time() const
{
  return running ?
         elapsed_time + get_current_time() - start_time :
         elapsed_time;
}
 
void Timer::tic(void)
{
  reset();
  start();
}
 
double Timer::toc(void)
{
  return get_time() ;
}
 
void Timer::toc_print(void)
{
  std::cout << "Elapsed time = " << get_time() << " seconds" << std::endl;
}
 
//----------------------------------------------------------------------------
// class CPU_Timer
//----------------------------------------------------------------------------
double CPU_Timer::get_current_time() const
{
  return static_cast<double>(clock()) / CLOCKS_PER_SEC;
}
 
//----------------------------------------------------------------------------
// class Real_Timer
//----------------------------------------------------------------------------
double Real_Timer::get_current_time() const
{
  struct timeval t;
  gettimeofday(&t, 0);
  return t.tv_sec + t.tv_usec * 1.0e-6;
}
 
 
void tic()
{
  __tic_toc_timer.tic();
}
 
double toc()
{
  return __tic_toc_timer.toc();
}
 
void toc_print()
{
  __tic_toc_timer.toc_print();
}
 
void pause(double t)
{
  if (t == -1) {
    std::cout << "(Press enter to continue)" << std::endl;
    ::getchar();
  }
  else {
    Real_Timer T;
    T.start();
    while (T.get_time() < t);
  }
}
 
} // namespace itpp