Timer.cpp

/*
   Copyright (c) 2017, The University of Bristol, Senate House, Tyndall Avenue, Bristol, BS8 1TH, United Kingdom.
   Copyright (c) 2021, COSIC-KU Leuven, Kasteelpark Arenberg 10, bus 2452, B-3001 Leuven-Heverlee, Belgium.

   All rights reserved
   */

#include "Timer.h"

long long timeval_diff(struct timeval *start_time, struct timeval *end_time)
{
    struct timeval temp_diff;
    struct timeval *difference;
    difference= &temp_diff;
    difference->tv_sec= end_time->tv_sec - start_time->tv_sec;
    difference->tv_usec= end_time->tv_usec - start_time->tv_usec;
    while (difference->tv_usec < 0)
    {
        difference->tv_usec+= 1000000;
        difference->tv_sec-= 1;
    }
    return 1000000LL * difference->tv_sec + difference->tv_usec;
}

double timeval_diff_in_seconds(struct timeval *start_time, struct timeval *end_time)
{
    return double(timeval_diff(start_time, end_time)) / 1e6;
}

#ifndef __MACH__
long long timespec_diff(struct timespec *start_time, struct timespec *end_time)
{
    long long sec= end_time->tv_sec - start_time->tv_sec;
    long long nsec= end_time->tv_nsec - start_time->tv_nsec;
    while (nsec < 0)
    {
        nsec+= 1000000000;
        sec-= 1;
    }
    return 1000000000 * sec + nsec;
}
#endif

double convert_ns_to_seconds(long long x)
{
#ifdef __MACH__
    return double(x) / 1e6;
#else
    return double(x) / 1e9;
#endif
}

double Timer::elapsed()
{
    long long res= elapsed_time;
    if (running)
        res+= elapsed_since_last_start();
    return convert_ns_to_seconds(res);
}