timer_hires.h

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/*
    Copyright (C) 2014-2020, Johannes Pekkila, Miikka Vaisala.
 
    This file is part of Astaroth.
 
    Astaroth 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 3 of the License, or
    (at your option) any later version.
 
    Astaroth 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 Astaroth.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#pragma once
#include <stdio.h> // perror
#include <time.h>
 
typedef struct timespec Timer;
// Contains at least the following members:
// time_t tv_sec;
// long tv_nsec;
 
static inline int
timer_reset(Timer* t)
{
    const int retval = clock_gettime(CLOCK_REALTIME, t);
    if (retval == -1)
        perror("clock_gettime failure");
 
    return retval;
}
 
static inline long
timer_diff_nsec(const Timer start)
{
    Timer end;
    timer_reset(&end);
    const long diff = (end.tv_sec - start.tv_sec) * 1000000000l + (end.tv_nsec - start.tv_nsec);
    return diff;
}
 
static inline void
timer_diff_print(const Timer t)
{
    printf("Time elapsed: %g ms\n", timer_diff_nsec(t) / 1e6);
}