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| From | BartC <bc@freeuk.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: CLOCKS_PER_SEC |
| Date | 2016-10-13 23:30 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <ntp1uj$jki$1@dont-email.me> (permalink) |
| References | <nto3cm$ps$1@dont-email.me> <lnr37kjl7y.fsf@kst-u.example.com> <lnmvi8jkq4.fsf@kst-u.example.com> <ntp16j$h6u$1@dont-email.me> |
On 13/10/2016 23:18, BartC wrote:
> On 13/10/2016 17:07, Keith Thompson wrote:
> I think I will try and detect Windows or Linux and assume 1000 or
> 1000000 respectively. Doing that would also require invocating a C
> compiler on something like '#ifdef WIN32', but I think I will try a
> quick and dirty method like detecting the existence of some known .exe
> file in C:/windows.
The following seems to work! It's expressed here in C but only depends
on standard fopen/fclose functions which can be called from anywhere.
I assume of course that it's always 1000 on Windows and 1000000 on
Linux, but that might be enough (I think one compiler used to use 100).
It's only for timing so it's not critical.
#include <stdio.h>
#include <stdlib.h>
int getclockspersec(void){
FILE *f;
if (f = fopen("c:/windows/notepad.exe","rb")) {
| fclose(f);
| return 1000;
}
return 1000000;
}
int main(int n, char** s) {
printf("%d\n",getclockspersec());
}
--
Bartc
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CLOCKS_PER_SEC BartC <bc@freeuk.com> - 2016-10-13 14:49 +0100
Re: CLOCKS_PER_SEC Keith Thompson <kst-u@mib.org> - 2016-10-13 08:57 -0700
Re: CLOCKS_PER_SEC Keith Thompson <kst-u@mib.org> - 2016-10-13 09:07 -0700
Re: CLOCKS_PER_SEC BartC <bc@freeuk.com> - 2016-10-13 23:18 +0100
Re: CLOCKS_PER_SEC BartC <bc@freeuk.com> - 2016-10-13 23:30 +0100
Re: CLOCKS_PER_SEC Keith Thompson <kst-u@mib.org> - 2016-10-13 16:27 -0700
Re: CLOCKS_PER_SEC raltbos@xs4all.nl (Richard Bos) - 2016-10-16 10:02 +0000
Re: CLOCKS_PER_SEC Keith Thompson <kst-u@mib.org> - 2016-10-16 11:32 -0700
Re: CLOCKS_PER_SEC Lowell Gilbert <lgusenet@be-well.ilk.org> - 2016-10-13 12:19 -0400
Re: CLOCKS_PER_SEC Keith Thompson <kst-u@mib.org> - 2016-10-13 11:29 -0700
Re: CLOCKS_PER_SEC Lowell Gilbert <lgusenet@be-well.ilk.org> - 2016-10-13 14:39 -0400
Re: CLOCKS_PER_SEC Keith Thompson <kst-u@mib.org> - 2016-10-13 12:03 -0700
Re: CLOCKS_PER_SEC supercat@casperkitty.com - 2016-10-14 07:47 -0700
Re: CLOCKS_PER_SEC Anton Shepelev <anton.txt@g{oogle}mail.com> - 2016-10-14 16:21 +0300
Re: CLOCKS_PER_SEC Keith Thompson <kst-u@mib.org> - 2016-10-14 08:41 -0700
Re: CLOCKS_PER_SEC Anton Shepelev <anton.txt@g{oogle}mail.com> - 2016-10-14 18:56 +0300
Re: CLOCKS_PER_SEC Barry Schwarz <schwarzb@dqel.com> - 2016-10-14 09:49 -0700
Re: CLOCKS_PER_SEC Keith Thompson <kst-u@mib.org> - 2016-10-14 11:14 -0700
Re: CLOCKS_PER_SEC supercat@casperkitty.com - 2016-10-14 11:32 -0700
Re: CLOCKS_PER_SEC Jerry Stuckle <jstucklex@attglobal.net> - 2016-10-14 11:56 -0400
Re: CLOCKS_PER_SEC Anton Shepelev <anton.txt@g{oogle}mail.com> - 2016-10-14 19:53 +0300
Re: CLOCKS_PER_SEC supercat@casperkitty.com - 2016-10-14 09:57 -0700
Re: CLOCKS_PER_SEC BartC <bc@freeuk.com> - 2016-10-14 18:18 +0100
Re: CLOCKS_PER_SEC Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-10-16 02:55 -0700
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