1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at http://curl.haxx.se/docs/copyright.html.
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 * $Id: timeval.c,v 1.1.1.1 2008-09-23 16:32:05 hoffman Exp $
22 ***************************************************************************/
26 #if defined(WIN32) && !defined(MSDOS)
28 struct timeval
curlx_tvnow(void)
31 ** GetTickCount() is available on _all_ Windows versions from W95 up
32 ** to nowadays. Returns milliseconds elapsed since last system boot,
33 ** increases monotonically and wraps once 49.7 days have elapsed.
36 DWORD milliseconds
= GetTickCount();
37 now
.tv_sec
= milliseconds
/ 1000;
38 now
.tv_usec
= (milliseconds
% 1000) * 1000;
42 #elif defined(HAVE_CLOCK_GETTIME_MONOTONIC)
44 struct timeval
curlx_tvnow(void)
47 ** clock_gettime() is granted to be increased monotonically when the
48 ** monotonic clock is queried. Time starting point is unspecified, it
49 ** could be the system start-up time, the Epoch, or something else,
50 ** in any case the time starting point does not change once that the
51 ** system has started up.
54 struct timespec tsnow
;
55 if(0 == clock_gettime(CLOCK_MONOTONIC
, &tsnow
)) {
56 now
.tv_sec
= tsnow
.tv_sec
;
57 now
.tv_usec
= tsnow
.tv_nsec
/ 1000;
60 ** Even when the configure process has truly detected monotonic clock
61 ** availability, it might happen that it is not actually available at
62 ** run-time. When this occurs simply fallback to other time source.
64 #ifdef HAVE_GETTIMEOFDAY
66 (void)gettimeofday(&now
, NULL
);
69 now
.tv_sec
= (long)time(NULL
);
76 #elif defined(HAVE_GETTIMEOFDAY)
78 struct timeval
curlx_tvnow(void)
81 ** gettimeofday() is not granted to be increased monotonically, due to
82 ** clock drifting and external source time synchronization it can jump
83 ** forward or backward in time.
86 (void)gettimeofday(&now
, NULL
);
92 struct timeval
curlx_tvnow(void)
95 ** time() returns the value of time in seconds since the Epoch.
98 now
.tv_sec
= (long)time(NULL
);
106 * Make sure that the first argument is the more recent time, as otherwise
107 * we'll get a weird negative time-diff back...
109 * Returns: the time difference in number of milliseconds.
111 long curlx_tvdiff(struct timeval newer
, struct timeval older
)
113 return (newer
.tv_sec
-older
.tv_sec
)*1000+
114 (newer
.tv_usec
-older
.tv_usec
)/1000;
118 * Same as curlx_tvdiff but with full usec resolution.
120 * Returns: the time difference in seconds with subsecond resolution.
122 double curlx_tvdiff_secs(struct timeval newer
, struct timeval older
)
124 return (double)(newer
.tv_sec
-older
.tv_sec
)+
125 (double)(newer
.tv_usec
-older
.tv_usec
)/1000000.0;
128 /* return the number of seconds in the given input timeval struct */
129 long Curl_tvlong(struct timeval t1
)