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does usleep() sleep more than it's supposed to?
- From: Carlo Florendo <subscribermail at gmail dot com>
- To: cygwin at cygwin dot com
- Date: Mon, 26 Feb 2007 15:57:10 +0800
- Subject: does usleep() sleep more than it's supposed to?
Good Day,
I'm writing an application that requires time precisions up to the
microsecond level. However, I put a hard-coded adjustment of
9000 microseconds since usleep() seems to sleep on the average of
9000 microseconds more than it's supposed to, at least on my
system. I could work with up to 2000 microseconds for
function overhead but 9000 microseconds seems to be too long.
I've attached a simple test case that let's usleep() sleep at
100000 microseconds at each call.
I've also included the output of cygcheck -svr.
The output of the attached code on my system is the following:
admin@host144 /cygdrive/e/midi
$ gcc time2.c
admin@host144 /cygdrive/e/midi
$ ./a.exe
Print elapsed time at every call to usleep()
Elapsed time (sec:microsec) 0:109000
Elapsed time (sec:microsec) 0:109000
Elapsed time (sec:microsec) 0:110000
Elapsed time (sec:microsec) 0:109000
Elapsed time (sec:microsec) 0:109000
Elapsed time (sec:microsec) 0:110000
Elapsed time (sec:microsec) 0:109000
Elapsed time (sec:microsec) 0:110000
Elapsed time (sec:microsec) 0:109000
Elapsed time (sec:microsec) 0:109000
Print elapsed after the loop()
Elapsed time (sec:microsec) 1:94000
^^^^^^^
calling usleep() 10 times
made it sleep an additional
94000 microseconds.
Please note that I am aware of GetSystemTimeAdjustment()
and it seems not to have an effect on my observations.
Is the above the expected usleep() behaviour? If not, how do we let
usleep() sleep properly?
Thank you very much!
Best Regards,
Carlo
--
Carlo Florendo
Softare Engineer/Network Co-Administrator
Astra Philippines Inc.
UP-Ayala Technopark, Diliman 1101, Quezon City
Philippines
http://www.astra.ph
Member of the Astra Group of Companies
5-3-11 Sekido, Tama City
Tokyo 206-0011, Japan
http://www.astra.co.jp
Cygwin Configuration Diagnostics
Current System Time: Mon Feb 26 15:50:36 2007
Windows 2000 Professional Ver 5.0 Build 2195 Service Pack 4
Path: e:\cygwin\usr\local\bin
e:\cygwin\bin
e:\cygwin\bin
e:\cygwin\usr\X11R6\bin
c:\WINNT\system32
c:\WINNT
c:\WINNT\System32\Wbem
f:\cygwin\bin
d:\MySQL\MySQL Server 4.1\bin
d:\Common Files\GTK\2.0\bin
d:\Microsoft Visual Studio\Common\Tools\WinNT
d:\Microsoft Visual Studio\Common\MSDev98\Bin
d:\Microsoft Visual Studio\Common\Tools
d:\Microsoft Visual Studio\VC98\bin
e:\cygwin\usr\local\bin
e:\cygwin\usr\local\sbin
Output from e:\cygwin\bin\id.exe (nontsec)
UID: 1000(admin) GID: 513(None)
0(root) 513(None) 544(Administrators) 545(Users)
Output from e:\cygwin\bin\id.exe (ntsec)
UID: 1000(admin) GID: 513(None)
0(root) 513(None) 544(Administrators) 545(Users)
SysDir: C:\WINNT\system32
WinDir: C:\WINNT
USER = 'admin'
PWD = '/cygdrive/e/midi'
CYGWIN = 'server'
HOME = '/home/admin'
MAKE_MODE = 'unix'
HOMEPATH = '\Documents and Settings\admin'
MANPATH = '/usr/local/man:/usr/share/man:/usr/man::/usr/ssl/man'
APPDATA = 'C:\Documents and Settings\admin\Application Data'
HOSTNAME = 'host144'
TERM = 'xterm'
PROCESSOR_IDENTIFIER = 'x86 Family 15 Model 1 Stepping 2, GenuineIntel'
WINDIR = 'C:\WINNT'
WINDOWID = '7879448'
OLDPWD = '/cygdrive/e/fd'
USERDOMAIN = 'THORIN'
OS = 'Windows_NT'
ALLUSERSPROFILE = 'C:\Documents and Settings\All Users'
OS2LIBPATH = 'C:\WINNT\system32\os2\dll;'
TEMP = '/cygdrive/c/DOCUME~1/admin/LOCALS~1/Temp'
COMMONPROGRAMFILES = 'C:\Program Files\Common Files'
LIB = 'D:\Microsoft Visual Studio\VC98\mfc\lib;D:\Microsoft Visual Studio\VC98\lib'
USERNAME = 'admin'
PROCESSOR_LEVEL = '15'
SYSTEMDRIVE = 'C:'
USERPROFILE = 'C:\Documents and Settings\admin'
PS1 = '\[\e]0;\w\a\]\n\[\e[32m\]\u@\h \[\e[33m\]\w\[\e[0m\]\n\$ '
LOGONSERVER = '\\THORIN'
PROCESSOR_ARCHITECTURE = 'x86'
SHLVL = '1'
COLORFGBG = '15;default;0'
PATHEXT = '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH'
HOMEDRIVE = 'C:'
COMSPEC = 'C:\WINNT\system32\cmd.exe'
TMP = '/cygdrive/c/DOCUME~1/admin/LOCALS~1/Temp'
SYSTEMROOT = 'C:\WINNT'
PRINTER = '\\aragorn\hp LaserJet 1000'
CVS_RSH = '/bin/ssh'
PROCESSOR_REVISION = '0102'
MSDEVDIR = 'D:\Microsoft Visual Studio\Common\MSDev98'
PKG_CONFIG_PATH = '/usr/X11R6/lib/pkgconfig'
INFOPATH = '/usr/local/info:/usr/share/info:/usr/info:'
PROGRAMFILES = 'C:\Program Files'
DISPLAY = ':0'
NUMBER_OF_PROCESSORS = '1'
INCLUDE = 'D:\Microsoft Visual Studio\VC98\atl\include;D:\Microsoft Visual Studio\VC98\mfc\include;D:\Microsoft Visual Studio\VC98\include'
COMPUTERNAME = 'THORIN'
COLORTERM = 'rxvt-xpm'
_ = '/usr/bin/cygcheck'
POSIXLY_CORRECT = '1'
HKEY_CURRENT_USER\Software\Cygnus Solutions
HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin
HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\mounts v2
HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\Program Options
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2
(default) = '/cygdrive'
cygdrive flags = 0x00000022
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2\/
(default) = 'e:\cygwin'
flags = 0x0000000a
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2\/usr/bin
(default) = 'e:\cygwin/bin'
flags = 0x0000000a
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2\/usr/lib
(default) = 'e:\cygwin/lib'
flags = 0x0000000a
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\Program Options
a: fd N/A N/A
c: hd NTFS 3906Mb 91% CP CS UN PA FC
d: hd FAT 3913Mb 66% CP UN
e: hd FAT32 9725Mb 27% CP UN EXTRA
f: hd FAT 509Mb 1% CP UN
g: cd N/A N/A
h: net NTFS 27650Mb 95% CP CS PA msdn
e:\cygwin / system binmode
e:\cygwin/bin /usr/bin system binmode
e:\cygwin/lib /usr/lib system binmode
. /cygdrive system binmode,cygdrive
Found: e:\cygwin\bin\awk.exe
Found: e:\cygwin\bin\bash.exe
Found: e:\cygwin\bin\cat.exe
Found: e:\cygwin\bin\cp.exe
Found: e:\cygwin\bin\cpp.exe
Not Found: crontab
Found: e:\cygwin\bin\find.exe
Found: e:\cygwin\bin\gcc.exe
Found: e:\cygwin\bin\gdb.exe
Found: e:\cygwin\bin\grep.exe
Found: e:\cygwin\bin\kill.exe
Found: e:\cygwin\bin\ld.exe
Found: e:\cygwin\bin\ls.exe
Found: e:\cygwin\bin\make.exe
Found: e:\cygwin\bin\mv.exe
Found: e:\cygwin\bin\patch.exe
Found: e:\cygwin\bin\perl.exe
Found: e:\cygwin\bin\rm.exe
Found: e:\cygwin\bin\sed.exe
Found: e:\cygwin\bin\ssh.exe
Found: e:\cygwin\bin\sh.exe
Found: e:\cygwin\bin\tar.exe
Found: e:\cygwin\bin\test.exe
Not Found: vi
Found: e:\cygwin\bin\vim.exe
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1065k 2006/06/09 e:\cygwin\bin\cygxml2-2.dll - os=4.0 img=1.0 sys=4.0
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1829k 2006/12/19 e:\cygwin\bin\cygwin1.dll - os=4.0 img=1.0 sys=4.0
"cygwin1.dll" v0.0 ts=2006/12/19 17:52
Cygwin DLL version info:
DLL version: 1.5.23
DLL epoch: 19
DLL bad signal mask: 19005
DLL old termios: 5
DLL malloc env: 28
API major: 0
API minor: 156
Shared data: 4
DLL identifier: cygwin1
Mount registry: 2
Cygnus registry name: Cygnus Solutions
Cygwin registry name: Cygwin
Program options name: Program Options
Cygwin mount registry name: mounts v2
Cygdrive flags: cygdrive flags
Cygdrive prefix: cygdrive prefix
Cygdrive default prefix:
Build date: Tue Dec 19 10:52:28 CET 2006
CVS tag: cr-0x5f1
Shared id: cygwin1S4
140k 2004/08/06 e:\cygwin\usr\X11R6\bin\cygglut-3.dll - os=4.0 img=1.0 sys=4.0
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56k 2004/03/11 e:\cygwin\usr\X11R6\bin\cygXft-1.dll - os=4.0 img=1.0 sys=4.0
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63k 2004/03/23 e:\cygwin\usr\X11R6\bin\cygXft-2.dll - os=4.0 img=1.0 sys=4.0
"cygXft-2.dll" v0.0 ts=2004/3/24 6:20
34k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygFS-6.dll - os=4.0 img=1.0 sys=4.0
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357k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygGL-1.dll - os=4.0 img=1.0 sys=4.0
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441k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygGLU-1.dll - os=4.0 img=1.0 sys=4.0
"cygGLU-1.dll" v0.0 ts=2005/10/27 2:48
74k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygICE-6.dll - os=4.0 img=1.0 sys=4.0
"cygICE-6.dll" v0.0 ts=2005/10/27 1:11
1662k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygOSMesa-4.dll - os=4.0 img=1.0 sys=4.0
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28k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygSM-6.dll - os=4.0 img=1.0 sys=4.0
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884k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygX11-6.dll - os=4.0 img=1.0 sys=4.0
"cygX11-6.dll" v0.0 ts=2005/10/27 1:07
7k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXRes-1.dll - os=4.0 img=1.0 sys=4.0
"cygXRes-1.dll" v0.0 ts=2005/10/27 3:00
27k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXTrap-6.dll - os=4.0 img=1.0 sys=4.0
"cygXTrap-6.dll" v0.0 ts=2005/10/27 3:00
8k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXau-6.dll - os=4.0 img=1.0 sys=4.0
"cygXau-6.dll" v0.0 ts=2005/10/27 0:31
250k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXaw-6.dll - os=4.0 img=1.0 sys=4.0
"cygXaw-6.dll" v0.0 ts=2005/10/27 1:33
354k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXaw-7.dll - os=4.0 img=1.0 sys=4.0
"cygXaw-7.dll" v0.0 ts=2005/10/27 1:39
360k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXaw-8.dll - os=4.0 img=1.0 sys=4.0
"cygXaw-8.dll" v0.0 ts=2005/10/27 1:45
7k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXcomposite-1.dll - os=4.0 img=1.0 sys=4.0
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30k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXcursor-1.dll - os=4.0 img=1.0 sys=4.0
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8k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXdamage-1.dll - os=4.0 img=1.0 sys=4.0
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16k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXdmcp-6.dll - os=4.0 img=1.0 sys=4.0
"cygXdmcp-6.dll" v0.0 ts=2005/10/27 0:34
7k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXevie-1.dll - os=4.0 img=1.0 sys=4.0
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50k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXext-6.dll - os=4.0 img=1.0 sys=4.0
"cygXext-6.dll" v0.0 ts=2005/10/27 1:14
15k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXfixes-3.dll - os=4.0 img=1.0 sys=4.0
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38k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygxrx-6.dll - os=4.0 img=1.0 sys=4.0
"cygxrx-6.dll" v0.0 ts=2005/10/27 4:13
26k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXi-6.dll - os=4.0 img=1.0 sys=4.0
"cygXi-6.dll" v0.0 ts=2005/10/27 1:48
74k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXmu-6.dll - os=4.0 img=1.0 sys=4.0
"cygXmu-6.dll" v0.0 ts=2005/10/27 1:22
10k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXmuu-1.dll - os=4.0 img=1.0 sys=4.0
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26k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXp-6.dll - os=4.0 img=1.0 sys=4.0
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54k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXpm-4.dll - os=4.0 img=1.0 sys=4.0
"cygXpm-4.dll" v0.0 ts=2005/10/27 1:26
10k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXrandr-2.dll - os=4.0 img=1.0 sys=4.0
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30k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXrender-1.dll - os=4.0 img=1.0 sys=4.0
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283k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXt-6.dll - os=4.0 img=1.0 sys=4.0
"cygXt-6.dll" v0.0 ts=2005/10/27 1:19
17k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygXtst-6.dll - os=4.0 img=1.0 sys=4.0
"cygXtst-6.dll" v0.0 ts=2005/10/27 1:49
20k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygfontenc-1.dll - os=4.0 img=1.0 sys=4.0
"cygfontenc-1.dll" v0.0 ts=2005/10/27 3:14
8k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygoldX-6.dll - os=4.0 img=1.0 sys=4.0
"cygoldX-6.dll" v0.0 ts=2005/10/27 1:09
121k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygxkbfile-1.dll - os=4.0 img=1.0 sys=4.0
"cygxkbfile-1.dll" v0.0 ts=2005/10/27 1:54
11k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygxkbui-1.dll - os=4.0 img=1.0 sys=4.0
"cygxkbui-1.dll" v0.0 ts=2005/10/27 1:54
24k 2005/10/27 e:\cygwin\usr\X11R6\bin\cygxrxnest-6.dll - os=4.0 img=1.0 sys=4.0
"cygxrxnest-6.dll" v0.0 ts=2005/10/27 4:14
26k 2005/09/21 e:\cygwin\usr\X11R6\bin\cygDtPrint-1.dll - os=4.0 img=1.0 sys=4.0
"cygDtPrint-1.dll" v0.0 ts=2005/9/22 7:31
74k 2005/09/21 e:\cygwin\usr\X11R6\bin\cygMrm-2.dll - os=4.0 img=1.0 sys=4.0
"cygMrm-2.dll" v0.0 ts=2005/9/22 7:30
63k 2005/09/21 e:\cygwin\usr\X11R6\bin\cygUil-2.dll - os=4.0 img=1.0 sys=4.0
"cygUil-2.dll" v0.0 ts=2005/9/22 7:31
1185k 2005/09/21 e:\cygwin\usr\X11R6\bin\cygXm-2.dll - os=4.0 img=1.0 sys=4.0
"cygXm-2.dll" v0.0 ts=2005/9/22 7:27
Service : cygserver
Current State : Stopped
Command : /usr/sbin/cygserver.exe
stdin path : /dev/null
stdout path : /var/log/cygserver.log
stderr path : /var/log/cygserver.log
Process Type : Own Process
Startup : Disabled
Account : LocalSystem
Service : deler
Current State : Stopped
Command : /cygdrive/c/a.exe
stdin path : /dev/null
stdout path : /var/log/deler.log
stderr path : /var/log/deler.log
Process Type : Own Process
Startup : Disabled
Account : LocalSystem
Service : httpd
Display name : CYGWIN httpd (apache)
Current State : Stopped
Command : /usr/sbin/httpd.exe -F
stdin path : /dev/null
stdout path : /var/log/httpd.log
stderr path : /var/log/httpd.log
Process Type : Own Process
Startup : Disabled
Account : LocalSystem
Service : postgresql
Current State : Stopped
Command : /usr/bin/postmaster -D /var/postgresql/data -i
stdin path : /dev/null
stdout path : /var/log/postgresql.log
stderr path : /var/log/postgresql.log
Special flags : --shutdown
Termination Signal : Interrupt
Environment : CYGWIN="server"
Process Type : Own Process
Startup : Disabled
Dependencies : cygserver
Account : .\admin
Cygwin Package Information
Last downloaded files to: d:\cyg-installer
Last downloaded files from: http://kementari/ftp/pub/mirrors/cygwin/
Package Version
_update-info-dir 00494-1
alternatives 1.3.29a-1
ash 20040127-3
aspell 0.50.3-1
aspell-en 0.51.0-1
autoconf 4-1
autoconf2.1 2.13-3
autoconf2.5 2.61-1
automake 2-1
automake1.10 1.10-1
automake1.4 1.4p6-4
automake1.5 1.5-2
automake1.6 1.6.3-3
automake1.7 1.7.9-3
automake1.8 1.8.5-3
automake1.9 1.9.6-2
base-files 3.7-1
base-passwd 2.2-1
bash 3.2.9-10
bashdb 3.1_0.07-1
bc 1.06-2
binutils 20060817-1
bzip2 1.0.3-2
coreutils 6.7-2
crypt 1.1-1
cvs 1.11.22-1
cygrunsrv 1.17-1
cygutils 1.3.1-1
cygwin 1.5.23-2
cygwin-doc 1.4-4
diffutils 2.8.7-1
doxygen 1.5.1-1
e2fsprogs 1.35-3
editrights 1.01-1
expat 1.95.8-1
file 4.19-1
findutils 4.3.2-3
fontconfig 2.4.1-4
fortune 1.99.1-2
freeglut 2.2.0-1
freetype2 2.1.9-1
gawk 3.1.5-4
gcc 3.4.4-3
gcc-core 3.4.4-3
gcc-g++ 3.4.4-3
gcc-mingw-core 20050522-1
gcc-mingw-g++ 20050522-1
gdb 20060706-2
gdbm 1.8.3-8
gettext 0.15-1
ghostscript-base 8.50-1
GraphicsMagick 1.0.6-1
grep 2.5.1a-2
groff 1.18.1-2
gzip 1.3.9-1
hexedit 1.2.10-1
ImageMagick 6.3.0.1-2
inetutils 1.3.2-35
ioperm 0.4-1
jasper 1.701.0-1
jbigkit 1.6-1
lcms 1.14-1
less 381-1
lesstif 0.94.4-1
libaspell15 0.50.3-1
libbz2_1 1.0.3-2
libcharset1 1.11-1
libdb4.2 4.2.52-1
libdb4.3 4.3.28-1
libfontconfig-devel 2.4.1-4
libfontconfig1 2.4.1-4
libfpx 1.2.0.12-1
libfreetype2-devel 2.1.9-1
libfreetype26 2.1.9-1
libgc 6.4-1
libgdbm 1.8.0-5
libgdbm-devel 1.8.3-8
libgdbm3 1.8.3-3
libgdbm4 1.8.3-8
libGraphicsMagick0 1.0.6-1
libiconv 1.11-1
libiconv2 1.11-1
libintl 0.10.38-3
libintl1 0.10.40-1
libintl2 0.12.1-3
libintl3 0.14.5-1
libintl8 0.15-1
libjbig1 1.5-3
libjbig2 1.6-1
libjpeg62 6b-12
libltdl3 1.5.23a-2
libMagick10 6.3.0.1-2
libMagick6 6.0.4-1
libncurses5 5.2-1
libncurses6 5.2-8
libncurses7 5.3-4
libncurses8 5.5-3
libpcre0 6.6-1
libpng12 1.2.12-1
libpopt0 1.6.4-4
libreadline4 4.1-2
libreadline5 4.3-5
libreadline6 5.2.1-6
libtiff4 3.6.0-5
libtiff5 3.8.2-3
libtool1.5 1.5.23a-2
libwmf 0.2.8.4-1
libXft 2.1.6-1
libXft-devel 2.1.6-1
libXft1 1.0.0-1
libXft2 2.1.6-1
libxml2 2.6.26-1
links 0.99pre14-1
login 1.9-7
lynx 2.8.5-4
m4 1.4.8-1
make 3.81-1
man 1.6d-2
mingw-runtime 3.11-1
minires 1.01-1
mktemp 1.5-4
ncftp 3.2.0-1
ncurses 5.5-3
netcat 1.10-2
openssh 4.5p1-1
openssl 0.9.8d-1
openssl097 0.9.7l-1
patch 2.5.8-8
patchutils 0.2.31-1
pcre 6.6-1
pcre-devel 6.6-1
pcre-doc 6.6-1
perl 5.8.7-5
rsync 2.6.6-1
run 1.1.10-1
rxvt 20050409-4
sed 4.1.5-2
sharutils 4.6.3-1
t1lib 5.1.0-1
tar 1.16.1-1
tcltk 20060202-1
termcap 20050421-1
terminfo 5.5_20061104-1
texinfo 4.8-3
unzip 5.52-2
util-linux 2.12r-2
vim 7.0.122-1
w32api 3.8-1
w3m 0.5.1-1
wget 1.10.2-2
which 1.7-1
X-startup-scripts 1.0.11-1
xinetd 2.3.9-1
xorg-x11-base 6.8.99.901-1
xorg-x11-bin 6.8.99.901-1
xorg-x11-bin-dlls 6.8.99.901-1
xorg-x11-bin-lndir 6.8.99.901-1
xorg-x11-devel 6.8.99.901-1
xorg-x11-etc 6.8.99.901-1
xorg-x11-fenc 6.8.99.901-1
xorg-x11-fnts 6.8.99.901-1
xorg-x11-libs-data 6.8.99.901-1
xorg-x11-xwin 6.8.99.901-1
xpdf 3.01-2
xterm 202-1
zip 2.32-2
zlib 1.2.3-2
Use -h to see help about each section
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
#include <time.h>
#include <windows.h>
/*
timeval_subtract() code taken from the GLIBC docs at gnu.org
http://www.gnu.org/software/libc/manual/html_node/Elapsed-Time.html
*/
int timeval_subtract (struct timeval *result, struct timeval *x,
struct timeval *y)
{
int nsec;
/* Perform the carry for the later subtraction by updating y. */
if (x->tv_usec < y->tv_usec)
{
nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
y->tv_usec -= 1000000 * nsec;
y->tv_sec += nsec;
}
if (x->tv_usec - y->tv_usec > 1000000)
{
nsec = (x->tv_usec - y->tv_usec) / 1000000;
y->tv_usec += 1000000 * nsec;
y->tv_sec -= nsec;
}
/* Compute the time remaining to wait.
tv_usec is certainly positive. */
result->tv_sec = x->tv_sec - y->tv_sec;
result->tv_usec = x->tv_usec - y->tv_usec;
/* Return 1 if result is negative. */
return x->tv_sec < y->tv_sec;
}
int main()
{
struct timeval tv1, tv2, result;
int x;
/* let's put our calibration parameters here */
/* Let's cache usleep (if there is such a thing). It seems the first call
to usleep takes longer than the rest. */
usleep(0);
printf("Print elapsed time at every call to usleep()\n");
for (x = 0; x < 10; x++)
{
gettimeofday(&tv1, NULL);
usleep(100000);
gettimeofday(&tv2, NULL);
timeval_subtract(&result, &tv2, &tv1);
printf("Elapsed time (sec:microsec) %d:%d\n", result.tv_sec,
result.tv_usec);
}
printf("\n");
printf("Print elapsed after the loop()\n");
gettimeofday(&tv1, NULL);
for (x = 0; x < 10; x++)
{
usleep(100000);
}
gettimeofday(&tv2, NULL);
printf("Elapsed time (sec:microsec) %d:%d\n", result.tv_sec,
result.tv_usec);
timeval_subtract(&result, &tv2, &tv1);
return 0;
}
--
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