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#include <time.h>
clock_t startTime = 0;
clock_t middleEnd = 0;
clock_t middleBegin = 0;
clock_t endTime = 0;
clock_t curtime = 0;
double timePerIteration = 0;
clock_t getBeginTime()
{
clock_t beginTime;
clock_t lastTime = clock();
while((beginTime = clock()) == lastTime);
return beginTime;
}
clock_t getEndTime()
{
unsigned int i = 0;
clock_t beginTime = clock();
clock_t endTime = beginTime;
clock_t newEnd;
while((endTime = clock()) == beginTime) ++i;
newEnd = endTime - (clock_t)(timePerIteration * (double)(i));
return (newEnd > beginTime) ? newEnd : beginTime;
}
void start_timer()
{
middleEnd = 0;
middleBegin = 0;
endTime = 0;
curtime = 0;
startTime = getBeginTime();
}
void middle_time()
{
middleEnd = getEndTime();
middleBegin = getBeginTime();
}
double time_elapsed()
{
return (double)(clock() - startTime) / (double)(CLOCKS_PER_SEC);
}
void stop_timer()
{
endTime = getEndTime();
if(middleEnd){
curtime = (endTime - middleEnd) - (middleBegin - startTime);
}else{
curtime = endTime - startTime;
}
}
double getSecs()
{
return (double)(curtime) / (double)(CLOCKS_PER_SEC);
}
double getNanoPerN(unsigned int N)
{
return (getSecs() / (double)(N)) * (double)(1.0e9);
}
void calibrate_timer()
{
/* Calculating timePerIteration this will take arround a second. */
clock_t real_begin;
clock_t real_end;
unsigned int i = 0;
clock_t lastTime = getBeginTime();
real_begin = lastTime;
real_end = real_begin + CLOCKS_PER_SEC;
/* Looks a lot like the loop in getEndTime */
while((lastTime = clock()) < real_end) ++i;
timePerIteration = (double)(i) / (double)(lastTime - real_begin);
}
void printStatus()
{
printf("startTime = %lu, middleEnd = %lu, middleBegin = %lu, endTime = %lu, curtime = %lu, timePerIteration = %f\n",
startTime, middleEnd, middleBegin, endTime, curtime, timePerIteration);
}
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