05eaf0a9d08e4cfae9a1dddf28c12d906813a2fb
[openocd.git] / src / helper / time_support.c
1 /***************************************************************************
2 * Copyright (C) 2006 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * Copyright (C) 2007,2008 √ėyvind Harboe *
6 * oyvind.harboe@zylin.com *
7 * *
8 * Copyright (C) 2008 by Spencer Oliver *
9 * spen@spen-soft.co.uk *
10 * *
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. *
15 * *
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. *
20 * *
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 ***************************************************************************/
24
25 #ifdef HAVE_CONFIG_H
26 #include "config.h"
27 #endif
28
29 #include "time_support.h"
30
31 /* calculate difference between two struct timeval values */
32 int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y)
33 {
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;
37 y->tv_sec += nsec;
38 }
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;
42 y->tv_sec -= nsec;
43 }
44
45 result->tv_sec = x->tv_sec - y->tv_sec;
46 result->tv_usec = x->tv_usec - y->tv_usec;
47
48 /* Return 1 if result is negative. */
49 return x->tv_sec < y->tv_sec;
50 }
51
52 int timeval_add_time(struct timeval *result, long sec, long usec)
53 {
54 result->tv_sec += sec;
55 result->tv_usec += usec;
56
57 while (result->tv_usec > 1000000) {
58 result->tv_usec -= 1000000;
59 result->tv_sec++;
60 }
61
62 return 0;
63 }
64
65 /* compare two timevals and return -1/0/+1 accordingly */
66 int timeval_compare(const struct timeval *x, const struct timeval *y)
67 {
68 if (x->tv_sec < y->tv_sec)
69 return -1;
70 else if (x->tv_sec > y->tv_sec)
71 return 1;
72 else if (x->tv_usec < y->tv_usec)
73 return -1;
74 else if (x->tv_usec > y->tv_usec)
75 return 1;
76 else
77 return 0;
78 }
79
80 int duration_start(struct duration *duration)
81 {
82 return gettimeofday(&duration->start, NULL);
83 }
84
85 int duration_measure(struct duration *duration)
86 {
87 struct timeval end;
88 int retval = gettimeofday(&end, NULL);
89 if (0 == retval)
90 timeval_subtract(&duration->elapsed, &end, &duration->start);
91 return retval;
92 }
93
94 float duration_elapsed(const struct duration *duration)
95 {
96 float t = duration->elapsed.tv_sec;
97 t += (float)duration->elapsed.tv_usec / 1000000.0;
98 return t;
99 }
100
101 float duration_kbps(const struct duration *duration, size_t count)
102 {
103 return count / (1024.0 * duration_elapsed(duration));
104 }

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