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, write to the *
23 * Free Software Foundation, Inc., *
24 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
25 ***************************************************************************/
30 #include "time_support.h"
34 /* calculate difference between two struct timeval values */
35 int timeval_subtract(struct timeval
*result
, struct timeval
*x
, struct timeval
*y
)
37 if (x
->tv_usec
< y
->tv_usec
)
39 int nsec
= (y
->tv_usec
- x
->tv_usec
) / 1000000 + 1;
40 y
->tv_usec
-= 1000000 * nsec
;
43 if (x
->tv_usec
- y
->tv_usec
> 1000000) {
44 int nsec
= (x
->tv_usec
- y
->tv_usec
) / 1000000;
45 y
->tv_usec
+= 1000000 * nsec
;
49 result
->tv_sec
= x
->tv_sec
- y
->tv_sec
;
50 result
->tv_usec
= x
->tv_usec
- y
->tv_usec
;
52 /* Return 1 if result is negative. */
53 return x
->tv_sec
< y
->tv_sec
;
56 /* add two struct timeval values */
57 int timeval_add(struct timeval
*result
, struct timeval
*x
, struct timeval
*y
)
59 result
->tv_sec
= x
->tv_sec
+ y
->tv_sec
;
61 result
->tv_usec
= x
->tv_usec
+ y
->tv_usec
;
63 while (result
->tv_usec
> 1000000)
65 result
->tv_usec
-= 1000000;
72 int timeval_add_time(struct timeval
*result
, int sec
, int usec
)
74 result
->tv_sec
+= sec
;
75 result
->tv_usec
+= usec
;
77 while (result
->tv_usec
> 1000000)
79 result
->tv_usec
-= 1000000;
86 void duration_start_measure(duration_t
*duration
)
88 gettimeofday(&duration
->start
, NULL
);
91 int duration_stop_measure(duration_t
*duration
, char **text
)
95 gettimeofday(&end
, NULL
);
97 timeval_subtract(&duration
->duration
, &end
, &duration
->start
);
102 t
=duration
->duration
.tv_sec
;
103 t
+=(float)duration
->duration
.tv_usec
/1000000.0;
105 snprintf(*text
, 100, "%fs", t
);
111 long long timeval_ms()
115 gettimeofday(&now
, NULL
);