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/**************************************************************************
*
* Copyright 2011 Jose Fonseca
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**************************************************************************/
/*
* Simple OS time measurement abstraction.
*/
#ifndef _OS_TIME_HPP_
#define _OS_TIME_HPP_
#if defined(_WIN32)
#include <windows.h>
#elif defined(__linux__)
#include <time.h>
#else
#include <sys/time.h>
#endif
namespace os {
// OS dependent time frequency
#if defined(_WIN32)
// runtime variable on Windows
extern long long timeFrequency;
#elif defined(__linux__)
// nanoseconds
static const long long timeFrequency = 1000000000;
#else
// microseconds on
static const long long timeFrequency = 1000000;
#endif
// Time from an unknown base in a unit determined by timeFrequency
inline long long
getTime(void) {
#if defined(_WIN32)
if (!timeFrequency) {
LARGE_INTEGER frequency;
QueryPerformanceFrequency(&frequency);
timeFrequency = frequency.QuadPart;
}
LARGE_INTEGER counter;
QueryPerformanceCounter(&counter);
return counter.QuadPart;
#elif defined(__linux__)
struct timespec tp;
if (clock_gettime(CLOCK_REALTIME, &tp) == -1) {
return 0;
}
return tp.tv_sec * 1000000000LL + tp.tv_nsec;
#else
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000000LL + tv.tv_usec;
#endif
}
} /* namespace os */
#endif /* _OS_TIME_HPP_ */
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