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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkRealTimeClock.cxx,v $
Language: C++
Date: $Date: 2005-11-29 14:51:11 $
Version: $Revision: 1.3 $
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#include <iostream>
#include "itkRealTimeClock.h"
#if defined(WIN32) || defined(_WIN32)
#include <windows.h>
#else
#include <sys/time.h>
#endif // defined(WIN32) || defined(_WIN32)
namespace itk
{
/** Constructor */
RealTimeClock::RealTimeClock():m_Frequency(1)
{
#if defined(WIN32) || defined(_WIN32)
LARGE_INTEGER frequency;
::QueryPerformanceFrequency(&frequency);
this->m_Frequency =
static_cast< FrequencyType >( (__int64)frequency.QuadPart );
SYSTEMTIME st1;
SYSTEMTIME st2;
FILETIME ft1;
FILETIME ft2;
::memset( &st1, 0, sizeof( st1 ) );
::memset( &st2, 0, sizeof( st2 ) );
st1.wYear = 1601;
st1.wMonth = 1;
st1.wDay = 1;
st2.wYear = 1970;
st2.wMonth = 1;
st2.wDay = 1;
::SystemTimeToFileTime(&st1, &ft1);
::SystemTimeToFileTime(&st2, &ft2);
LARGE_INTEGER ui1;
LARGE_INTEGER ui2;
memcpy( &ui1, &ft1, sizeof( ui1 ) );
memcpy( &ui2, &ft2, sizeof( ui2 ) );
this->m_Difference =
static_cast< TimeStampType >( ui2.QuadPart - ui1.QuadPart) /
static_cast< TimeStampType >( 1e7 );
FILETIME currentTime;
LARGE_INTEGER intTime;
LARGE_INTEGER tick;
::GetSystemTimeAsFileTime( ¤tTime );
::QueryPerformanceCounter( &tick );
memcpy( &intTime, ¤tTime, sizeof( intTime ) );
this->m_Origin =
static_cast< TimeStampType >( intTime.QuadPart ) /
static_cast< TimeStampType >( 1e7 );
this->m_Origin -=
static_cast< TimeStampType >( (__int64)tick.QuadPart ) /
this->m_Frequency;
this->m_Origin += this->m_Difference;
#else
this->m_Frequency = 1e6;;
#endif // defined(WIN32) || defined(_WIN32)
}
/** Destructor */
RealTimeClock::~RealTimeClock()
{
}
/** Returns a timestamp in seconds */
RealTimeClock::TimeStampType
RealTimeClock::GetTimeStamp() const
{
#if defined(WIN32) || defined(_WIN32)
LARGE_INTEGER tick;
::QueryPerformanceCounter( &tick );
TimeStampType value =
static_cast< TimeStampType >( (__int64)tick.QuadPart ) /
this->m_Frequency;
value += this->m_Origin;
return value;
#else
struct timeval tval;
::gettimeofday( &tval, 0 );
TimeStampType value =
static_cast< TimeStampType >( tval.tv_sec ) +
static_cast< TimeStampType >( tval.tv_usec ) / this->m_Frequency;
return value;
#endif // defined(WIN32) || defined(_WIN32)
}
/** Print the object */
void RealTimeClock::PrintSelf( std::ostream& os, itk::Indent indent ) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Frequency of the clock: "
<< this->m_Frequency << std::endl;
os << indent << "Difference : "
<< this->m_Difference << std::endl;
os << indent << "Origin : "
<< this->m_Origin << std::endl;
}
}
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