1 /***************************************************************************
2 * Copyright (C) 2006 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
5 * Copyright (C) 2007,2008 Øyvind Harboe *
6 * oyvind.harboe@zylin.com *
8 * Copyright (C) 2008 by Spencer Oliver *
9 * spen@spen-soft.co.uk *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
16 * This program is distributed in the hope that it will be useful, *
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
19 * GNU General Public License for more details. *
21 * You should have received a copy of the GNU General Public License *
22 * along with this program. If not, see <http://www.gnu.org/licenses/>. *
23 ***************************************************************************/
29 #include "time_support.h"
31 /* calculate difference between two struct timeval values */
32 int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y)
34 if (x->tv_usec < y->tv_usec) {
35 int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
36 y->tv_usec -= 1000000 * nsec;
39 if (x->tv_usec - y->tv_usec > 1000000) {
40 int nsec = (x->tv_usec - y->tv_usec) / 1000000;
41 y->tv_usec += 1000000 * nsec;
45 result->tv_sec = x->tv_sec - y->tv_sec;
46 result->tv_usec = x->tv_usec - y->tv_usec;
48 /* Return 1 if result is negative. */
49 return x->tv_sec < y->tv_sec;
52 int timeval_add_time(struct timeval *result, long sec, long usec)
54 result->tv_sec += sec;
55 result->tv_usec += usec;
57 while (result->tv_usec > 1000000) {
58 result->tv_usec -= 1000000;
65 int duration_start(struct duration *duration)
67 return gettimeofday(&duration->start, NULL);
70 int duration_measure(struct duration *duration)
73 int retval = gettimeofday(&end, NULL);
75 timeval_subtract(&duration->elapsed, &end, &duration->start);
79 float duration_elapsed(const struct duration *duration)
81 float t = duration->elapsed.tv_sec;
82 t += (float)duration->elapsed.tv_usec / 1000000.0;
86 float duration_kbps(const struct duration *duration, size_t count)
88 return count / (1024.0 * duration_elapsed(duration));