OpenACC-course/lab1/C/task2/timer.h

68 lines
1.5 KiB
C

/*
* Copyright 2012 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef TIMER_H
#define TIMER_H
#include <stdlib.h>
#ifdef WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#else
#include <sys/time.h>
#endif
#ifdef WIN32
double PCFreq = 0.0;
__int64 timerStart = 0;
#else
struct timeval timerStart;
#endif
void StartTimer()
{
#ifdef WIN32
LARGE_INTEGER li;
if(!QueryPerformanceFrequency(&li))
printf("QueryPerformanceFrequency failed!\n");
PCFreq = (double)li.QuadPart/1000.0;
QueryPerformanceCounter(&li);
timerStart = li.QuadPart;
#else
gettimeofday(&timerStart, NULL);
#endif
}
// time elapsed in ms
double GetTimer()
{
#ifdef WIN32
LARGE_INTEGER li;
QueryPerformanceCounter(&li);
return (double)(li.QuadPart-timerStart)/PCFreq;
#else
struct timeval timerStop, timerElapsed;
gettimeofday(&timerStop, NULL);
timersub(&timerStop, &timerStart, &timerElapsed);
return timerElapsed.tv_sec*1000.0+timerElapsed.tv_usec/1000.0;
#endif
}
#endif // TIMER_H