vpTime.cpp

/****************************************************************************
 *
 * This file is part of the ViSP software.
 * Copyright (C) 2005 - 2017 by Inria. All rights reserved.
 *
 * This software 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.
 * See the file LICENSE.txt at the root directory of this source
 * distribution for additional information about the GNU GPL.
 *
 * For using ViSP with software that can not be combined with the GNU
 * GPL, please contact Inria about acquiring a ViSP Professional
 * Edition License.
 *
 * See http://visp.inria.fr for more information.
 *
 * This software was developed at:
 * Inria Rennes - Bretagne Atlantique
 * Campus Universitaire de Beaulieu
 * 35042 Rennes Cedex
 * France
 *
 * If you have questions regarding the use of this file, please contact
 * Inria at visp@inria.fr
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Description:
 * Time management and measurement.
 *
 * Authors:
 * Eric Marchand
 * Fabien Spindler
 *
 *****************************************************************************/

#include <ctime>

#include <visp3/core/vpDebug.h>
#include <visp3/core/vpTime.h>

// Unix depend version

#if !defined(_WIN32) && (defined(__unix__) || defined(__unix) || (defined(__APPLE__) && defined(__MACH__))) // UNIX
#include <sys/time.h>
#include <unistd.h>
#elif defined(_WIN32)
//#include <winbase.h>
#include <windows.h>
#endif

#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace vpTime
{
#endif

double minTimeForUsleepCall = 4;

double getMinTimeForUsleepCall() { return minTimeForUsleepCall; }

double measureTimeMs()
{
#if defined(_WIN32)
#if !defined(WINRT)
  LARGE_INTEGER time, frequency;
  QueryPerformanceFrequency(&frequency);
  if (frequency.QuadPart == 0) {
    return (timeGetTime());
  } else {
    QueryPerformanceCounter(&time);
    return (double)(1000.0 * time.QuadPart / frequency.QuadPart);
  }
#else
  throw(vpException(vpException::fatalError, "Cannot get time: not implemented on Universal Windows Platform"));
#endif
#elif !defined(_WIN32) && (defined(__unix__) || defined(__unix) || (defined(__APPLE__) && defined(__MACH__))) // UNIX
  struct timeval tp;
  gettimeofday(&tp, 0);
  return (1000.0 * tp.tv_sec + tp.tv_usec / 1000.0);
#endif
}

double measureTimeMicros()
{
#if defined(_WIN32)
#if !defined(WINRT)
  LARGE_INTEGER time, frequency;
  QueryPerformanceFrequency(&frequency);
  if (frequency.QuadPart == 0) {
    return (timeGetTime());
  } else {
    QueryPerformanceCounter(&time);
    return (double)(1000000.0 * time.QuadPart / frequency.QuadPart);
  }
#else
  throw(vpException(vpException::fatalError, "Cannot get time: not implemented on Universal Windows Platform"));
#endif
#elif !defined(_WIN32) && (defined(__unix__) || defined(__unix) || (defined(__APPLE__) && defined(__MACH__))) // UNIX
  struct timeval tp;
  gettimeofday(&tp, 0);
  return (1000000.0 * tp.tv_sec + tp.tv_usec);
#endif
}

int wait(double t0, double t)
{
  double timeCurrent, timeToWait;
  timeCurrent = measureTimeMs();

  timeToWait = t0 + t - timeCurrent;

  if (timeToWait <= 0.) // no need to wait
    return (1);
  else {
#if !defined(_WIN32) && (defined(__unix__) || defined(__unix) || (defined(__APPLE__) && defined(__MACH__))) // UNIX
    if (timeToWait > vpTime::minTimeForUsleepCall) {
      usleep((useconds_t)((timeToWait - vpTime::minTimeForUsleepCall) * 1000));
    }
    // Blocking loop to have an accurate waiting
    do {
      timeCurrent = measureTimeMs();
      timeToWait = t0 + t - timeCurrent;

    } while (timeToWait > 0.);

    return 0;
#elif defined(_WIN32)
#if !defined(WINRT_8_0)
    if (timeToWait > vpTime::minTimeForUsleepCall) {
      Sleep((DWORD)(timeToWait - vpTime::minTimeForUsleepCall));
    }
    // Blocking loop to have an accurate waiting
    do {
      timeCurrent = measureTimeMs();
      timeToWait = t0 + t - timeCurrent;

    } while (timeToWait > 0.);

    return 0;
#else
    throw(vpException(vpException::functionNotImplementedError,
                      "vpTime::wait() is not implemented on Windows Phone 8.0"));
#endif
#endif
  }
}

void wait(double t)
{
  double timeToWait = t;

  if (timeToWait <= 0.) // no need to wait
    return;
  else {
#if !defined(_WIN32) && (defined(__unix__) || defined(__unix) || (defined(__APPLE__) && defined(__MACH__))) // UNIX
    double t0 = measureTimeMs();
    if (timeToWait > vpTime::minTimeForUsleepCall) {
      usleep((useconds_t)((timeToWait - vpTime::minTimeForUsleepCall) * 1000));
    }
    // Blocking loop to have an accurate waiting
    do {
      double timeCurrent = measureTimeMs();
      timeToWait = t0 + t - timeCurrent;

    } while (timeToWait > 0.);

    return;
#elif defined(_WIN32)
#if !defined(WINRT_8_0)
    double t0 = measureTimeMs();
    if (timeToWait > vpTime::minTimeForUsleepCall) {
      Sleep((DWORD)(timeToWait - vpTime::minTimeForUsleepCall));
    }
    // Blocking loop to have an accurate waiting
    do {
      double timeCurrent = measureTimeMs();
      timeToWait = t0 + t - timeCurrent;

    } while (timeToWait > 0.);

    return;
#else
    throw(vpException(vpException::functionNotImplementedError,
                      "vpTime::wait() is not implemented on Windows Phone 8.0"));
#endif
#endif
  }
}

double measureTimeSecond() { return vpTime::measureTimeMs() / 1000.0; }

void sleepMs(double t)
{
#if !defined(_WIN32) && (defined(__unix__) || defined(__unix) || (defined(__APPLE__) && defined(__MACH__))) // UNIX
  usleep((useconds_t)(t * 1000));
#elif defined(_WIN32)
#if !defined(WINRT_8_0)
  Sleep((DWORD)(t));
#else
  throw(vpException(vpException::functionNotImplementedError,
                    "vpTime::sleepMs() is not implemented on Windows Phone 8.0"));
#endif
#endif
}

std::string getDateTime(const std::string &format)
{
  time_t rawtime;
  struct tm *timeinfo;
  char buffer[80];

  time(&rawtime);
  timeinfo = localtime(&rawtime);

  strftime(buffer, 80, format.c_str(), timeinfo);
  std::string str(buffer);

  return str;
}

#ifndef DOXYGEN_SHOULD_SKIP_THIS
};
#endif