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annotate lib/gethrxtime.c @ 7302:8a1a9361108c

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* _fpending.c: Include <config.h> unconditionally, since we no longer worry about uses that don't define HAVE_CONFIG_H. * acl.c, alloca.c, argmatch.c, atexit.c, backupfile.c: * basename.c, c-stack.c, c-strtod.c, calloc.c, canon-host.c: * canonicalize.c, chdir-long.c, chdir-safer.c, chown.c: * cloexec.c, close-stream.c, closeout.c, creat-safer.c: * cycle-check.c, diacrit.c, dirchownmod.c, dirfd.c, dirname.c: * dup-safer.c, dup2.c, error.c, euidaccess.c, exclude.c: * exitfail.c, fchmodat.c, fchown-stub.c, fd-safer.c: * file-type.c, fileblocks.c, filemode.c, filenamecat.c: * fnmatch.c, fopen-safer.c, fprintftime.c, free.c, fsusage.c: * ftruncate.c, fts-cycle.c, fts.c, full-write.c, gai_strerror.c: * getcwd.c, getdate.y, getdomainname.c, getgroups.c: * gethostname.c, gethrxtime.c, getloadavg.c, getlogin_r.c: * getndelim2.c, getnline.c, getopt.c, getopt1.c, getpass.c: * gettime.c, gettimeofday.c, getugroups.c, getusershell.c: * glob.c, group-member.c, hard-locale.c, hash-pjw.c, hash.c: * human.c, idcache.c, inet_ntop.c, inet_pton.c, inttostr.c: * isdir.c, lchown.c, linebuffer.c, long-options.c, lstat.c: * malloc.c, md5.c, memcasecmp.c, memchr.c, memcmp.c, memcoll.c: * memcpy.c, memmove.c, memrchr.c, mkancesdirs.c, mkdir-p.c: * mkdir.c, mkdirat.c, mkstemp-safer.c, mkstemp.c, modechange.c: * mountlist.c, nanosleep.c, obstack.c, open-safer.c: * openat-die.c, openat.c, pagealign_alloc.c, physmem.c: * pipe-safer.c, posixtm.c, posixver.c, putenv.c, quote.c: * quotearg.c, raise.c, readtokens.c, readtokens0.c, readutmp.c: * realloc.c, regex.c, rename.c, rmdir.c, rpmatch.c, safe-read.c: * same.c, save-cwd.c, savedir.c, setenv.c, settime.c, sha1.c: * sig2str.c, snprintf.c, strdup.c, strerror.c, strftime.c: * stripslash.c, strndup.c, strnlen.c, strpbrk.c, strtod.c: * strtoimax.c, strtol.c, strverscmp.c, tempname.c, time_r.c: * timegm.c, tmpfile-safer.c, unlinkdir.c, userspec.c, utime.c: * utimecmp.c, utimens.c, version-etc-fsf.c, version-etc.c: * xalloc-die.c, xgetcwd.c, xgethostname.c, xmalloc.c: * xmemcoll.c, xnanosleep.c, xreadlink.c, xstrtod.c: * xstrtoimax.c, xstrtol.c, xstrtoumax.c, yesno.c: Likewise.
author Paul Eggert <eggert@cs.ucla.edu>
date Wed, 13 Sep 2006 22:38:14 +0000
parents 232d8dc8525f
children b7a83a69ac23
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1 /* gethrxtime -- get high resolution real time
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2
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3 Copyright (C) 2005, 2006 Free Software Foundation, Inc.
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4
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5 This program is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
42df9db003cc * modules/gethrxtime: New file.
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software Foundation,
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a48fb0e98c8c *** empty log message ***
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17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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18
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19 /* Written by Paul Eggert. */
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20
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21 #include <config.h>
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22
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23 #include "gethrxtime.h"
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24
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25 #include "timespec.h"
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26
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27 /* Get the current time, as a count of the number of nanoseconds since
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28 an arbitrary epoch (e.g., the system boot time). Prefer a
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29 high-resolution clock that is not subject to resetting or
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30 drifting. */
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31
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32 xtime_t
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33 gethrxtime (void)
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34 {
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35 #if HAVE_NANOUPTIME
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36 {
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37 struct timespec ts;
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38 nanouptime (&ts);
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39 return xtime_make (ts.tv_sec, ts.tv_nsec);
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40 }
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41 #else
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42
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43 # if defined CLOCK_MONOTONIC && HAVE_CLOCK_GETTIME
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44 {
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45 struct timespec ts;
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46 if (clock_gettime (CLOCK_MONOTONIC, &ts) == 0)
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47 return xtime_make (ts.tv_sec, ts.tv_nsec);
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48 }
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49 # endif
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50
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51 # if HAVE_MICROUPTIME
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52 {
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53 struct timeval tv;
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54 microuptime (&tv);
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55 return xtime_make (tv.tv_sec, 1000 * tv.tv_usec);
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56 }
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57
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58 # else
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59 /* No monotonically increasing clocks are available; fall back on a
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60 clock that might jump backwards, since it's the best we can do. */
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61 {
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62 struct timespec ts;
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63 gettime (&ts);
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64 return xtime_make (ts.tv_sec, ts.tv_nsec);
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65 }
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66 # endif
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67 #endif
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68 }