MMDVMHost-Private/StopWatch.cpp

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2016-01-14 18:45:04 +00:00
/*
* Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "StopWatch.h"
#if defined(_WIN32) || defined(_WIN64)
CStopWatch::CStopWatch() :
m_frequency(),
m_start()
{
::QueryPerformanceFrequency(&m_frequency);
}
CStopWatch::~CStopWatch()
{
}
unsigned long CStopWatch::start()
{
::QueryPerformanceCounter(&m_start);
return (unsigned long)(m_start.QuadPart / m_frequency.QuadPart);
}
unsigned int CStopWatch::elapsed()
{
LARGE_INTEGER now;
::QueryPerformanceCounter(&now);
LARGE_INTEGER temp;
temp.QuadPart = (now.QuadPart - m_start.QuadPart) * 1000;
return (unsigned int)(temp.QuadPart / m_frequency.QuadPart);
}
#else
CStopWatch::CStopWatch() :
m_start()
{
}
CStopWatch::~CStopWatch()
{
}
unsigned long CStopWatch::start()
{
::clock_gettime(CLOCK_MONOTONIC, &m_start);
return m_start.tv_nsec;
}
unsigned int CStopWatch::elapsed()
{
timespec now;
::clock_gettime(CLOCK_MONOTONIC, &now);
if (m_start.tv_sec == now.tv_sec) {
return (now.tv_nsec - m_start.tv_nsec) / 1000000U;
} else {
long temp = -m_start.tv_nsec / 1000000L;
temp += (now.tv_sec - m_start.tv_sec) * 1000L;
temp += m_start.tv_nsec / 1000000L;
return temp;
}
}
#endif