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 ***************************************************************************/
25 #if defined(WIN32) && !defined(MSDOS)
27 struct timeval curlx_tvnow(void)
30 ** GetTickCount() is available on _all_ Windows versions from W95 up
31 ** to nowadays. Returns milliseconds elapsed since last system boot,
32 ** increases monotonically and wraps once 49.7 days have elapsed.
35 DWORD milliseconds = GetTickCount();
36 now.tv_sec = milliseconds / 1000;
37 now.tv_usec = (milliseconds % 1000) * 1000;
41 #elif defined(HAVE_CLOCK_GETTIME_MONOTONIC)
43 struct timeval curlx_tvnow(void)
46 ** clock_gettime() is granted to be increased monotonically when the
47 ** monotonic clock is queried. Time starting point is unspecified, it
48 ** could be the system start-up time, the Epoch, or something else,
49 ** in any case the time starting point does not change once that the
50 ** system has started up.
53 struct timespec tsnow;
54 if(0 == clock_gettime(CLOCK_MONOTONIC, &tsnow)) {
55 now.tv_sec = tsnow.tv_sec;
56 now.tv_usec = tsnow.tv_nsec / 1000;
59 ** Even when the configure process has truly detected monotonic clock
60 ** availability, it might happen that it is not actually available at
61 ** run-time. When this occurs simply fallback to other time source.
63 #ifdef HAVE_GETTIMEOFDAY
65 (void)gettimeofday(&now, NULL);
68 now.tv_sec = (long)time(NULL);
75 #elif defined(HAVE_GETTIMEOFDAY)
77 struct timeval curlx_tvnow(void)
80 ** gettimeofday() is not granted to be increased monotonically, due to
81 ** clock drifting and external source time synchronization it can jump
82 ** forward or backward in time.
85 (void)gettimeofday(&now, NULL);
91 struct timeval curlx_tvnow(void)
94 ** time() returns the value of time in seconds since the Epoch.
97 now.tv_sec = (long)time(NULL);
105 * Make sure that the first argument is the more recent time, as otherwise
106 * we'll get a weird negative time-diff back...
108 * Returns: the time difference in number of milliseconds.
110 long curlx_tvdiff(struct timeval newer, struct timeval older)
112 return (newer.tv_sec-older.tv_sec)*1000+
113 (newer.tv_usec-older.tv_usec)/1000;
117 * Same as curlx_tvdiff but with full usec resolution.
119 * Returns: the time difference in seconds with subsecond resolution.
121 double curlx_tvdiff_secs(struct timeval newer, struct timeval older)
123 if(newer.tv_sec != older.tv_sec)
124 return (double)(newer.tv_sec-older.tv_sec)+
125 (double)(newer.tv_usec-older.tv_usec)/1000000.0;
127 return (double)(newer.tv_usec-older.tv_usec)/1000000.0;
130 /* return the number of seconds in the given input timeval struct */
131 long Curl_tvlong(struct timeval t1)