133 строки
3.7 KiB
C
133 строки
3.7 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* $Id$
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***************************************************************************/
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#include "timeval.h"
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#if defined(WIN32) && !defined(MSDOS)
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struct timeval curlx_tvnow(void)
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{
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/*
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** GetTickCount() is available on _all_ Windows versions from W95 up
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** to nowadays. Returns milliseconds elapsed since last system boot,
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** increases monotonically and wraps once 49.7 days have elapsed.
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*/
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struct timeval now;
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DWORD milliseconds = GetTickCount();
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now.tv_sec = milliseconds / 1000;
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now.tv_usec = (milliseconds % 1000) * 1000;
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return now;
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}
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#elif defined(HAVE_CLOCK_GETTIME_MONOTONIC)
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struct timeval curlx_tvnow(void)
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{
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/*
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** clock_gettime() is granted to be increased monotonically when the
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** monotonic clock is queried. Time starting point is unspecified, it
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** could be the system start-up time, the Epoch, or something else,
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** in any case the time starting point does not change once that the
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** system has started up.
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*/
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struct timeval now;
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struct timespec tsnow;
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if(0 == clock_gettime(CLOCK_MONOTONIC, &tsnow)) {
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now.tv_sec = tsnow.tv_sec;
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now.tv_usec = tsnow.tv_nsec / 1000;
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}
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/*
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** Even when the configure process has truly detected monotonic clock
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** availability, it might happen that it is not actually available at
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** run-time. When this occurs simply fallback to other time source.
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*/
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#ifdef HAVE_GETTIMEOFDAY
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else
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(void)gettimeofday(&now, NULL);
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#else
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else {
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now.tv_sec = (long)time(NULL);
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now.tv_usec = 0;
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}
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#endif
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return now;
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}
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#elif defined(HAVE_GETTIMEOFDAY)
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struct timeval curlx_tvnow(void)
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{
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/*
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** gettimeofday() is not granted to be increased monotonically, due to
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** clock drifting and external source time synchronization it can jump
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** forward or backward in time.
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*/
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struct timeval now;
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(void)gettimeofday(&now, NULL);
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return now;
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}
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#else
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struct timeval curlx_tvnow(void)
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{
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/*
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** time() returns the value of time in seconds since the Epoch.
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*/
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struct timeval now;
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now.tv_sec = (long)time(NULL);
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now.tv_usec = 0;
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return now;
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}
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#endif
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/*
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* Make sure that the first argument is the more recent time, as otherwise
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* we'll get a weird negative time-diff back...
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*
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* Returns: the time difference in number of milliseconds.
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*/
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long curlx_tvdiff(struct timeval newer, struct timeval older)
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{
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return (newer.tv_sec-older.tv_sec)*1000+
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(newer.tv_usec-older.tv_usec)/1000;
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}
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/*
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* Same as curlx_tvdiff but with full usec resolution.
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*
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* Returns: the time difference in seconds with subsecond resolution.
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*/
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double curlx_tvdiff_secs(struct timeval newer, struct timeval older)
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{
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return (double)(newer.tv_sec-older.tv_sec)+
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(double)(newer.tv_usec-older.tv_usec)/1000000.0;
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}
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/* return the number of seconds in the given input timeval struct */
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long Curl_tvlong(struct timeval t1)
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{
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return t1.tv_sec;
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}
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