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/* Copyright 2013-2014 Pierre Ossman <ossman@cendio.se> for Cendio AB
*
* This 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 software 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 software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include <stdint.h>
#ifdef WIN32
#include <windows.h>
#else
#include <sys/resource.h>
#endif
#ifdef WIN32
static FILETIME cpuCounters[2];
#else
struct rusage cpuCounters[2];
#endif
static void measureCpu(void *counter)
{
#ifdef WIN32
FILETIME dummy1, dummy2, dummy3;
GetProcessTimes(GetCurrentProcess(), &dummy1, &dummy2,
&dummy3, (FILETIME*)counter);
#else
getrusage(RUSAGE_SELF, (struct rusage*)counter);
#endif
}
void startCpuCounter(void)
{
measureCpu(&cpuCounters[0]);
}
void endCpuCounter(void)
{
measureCpu(&cpuCounters[1]);
}
double getCpuCounter(void)
{
double seconds;
#ifdef WIN32
uint64_t counters[2];
counters[0] = (uint64_t)cpuCounters[0].dwHighDateTime << 32 |
cpuCounters[0].dwLowDateTime;
counters[1] = (uint64_t)cpuCounters[1].dwHighDateTime << 32 |
cpuCounters[1].dwLowDateTime;
seconds = (double)(counters[1] - counters[2]) / 10000000.0;
#else
seconds = (double)(cpuCounters[1].ru_utime.tv_sec -
cpuCounters[0].ru_utime.tv_sec);
seconds += (double)(cpuCounters[1].ru_utime.tv_usec -
cpuCounters[0].ru_utime.tv_usec) / 1000000.0;
#endif
return seconds;
}
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