/* -*- mode: C -*-  */
/*
   IGraph library.
   Copyright (C) 2013-2021  The igraph development team <igraph@igraph.org>

   This program 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 program 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 program.  If not, see <https://www.gnu.org/licenses/>.
*/

#ifndef IGRAPH_BENCH_H
#define IGRAPH_BENCH_H

#include <sys/resource.h> /* getrusage */
#include <sys/time.h>     /* gettimeofday */
#include <unistd.h>       /* sleep */

static inline void igraph_get_cpu_time(double *data) {

    struct rusage self;
    struct timeval real;
    gettimeofday(&real, NULL);
    getrusage(RUSAGE_SELF, &self);
    data[0] = (double) real.tv_sec          + 1e-6 * real.tv_usec;          /* real */
    data[1] = (double) self.ru_utime.tv_sec + 1e-6 * self.ru_utime.tv_usec; /* user */
    data[2] = (double) self.ru_stime.tv_sec + 1e-6 * self.ru_stime.tv_usec; /* system */
}

#define BENCH_INIT() \
    do { \
        printf("\n|> Benchmark file: %s\n", IGRAPH_FILE_BASENAME); \
        sleep(1); \
    } while (0)

#define REPEAT(CODE, N) \
    do { \
        long rep_i; \
        for (rep_i=0; rep_i < N; ++rep_i) { CODE; } \
    } while (0)

#define BENCH(NAME, ...)    do { \
        double start[3], stop[3]; \
        double r, u, s; \
        igraph_get_cpu_time(start); \
        { __VA_ARGS__; } \
        igraph_get_cpu_time(stop); \
        r = 1e-3 * round(1e3 * (stop[0] - start[0])); \
        u = 1e-3 * round(1e3 * (stop[1] - start[1])); \
        s = 1e-3 * round(1e3 * (stop[2] - start[2])); \
        printf("| %-80s %5.3gs  %5.3gs  %5.3gs\n", NAME, r, u, s); \
    } while (0)

#endif