From:	"John M. Aldrich" <fighteer AT cs DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: High speed timing
Date:	Fri, 30 Jan 1998 00:05:11 -0500
Organization:	Two pounds of chaos and a pinch of salt.
Lines:	27
Message-ID:	<34D15F87.2D13@cs.com>
References:	<34D11CA2 DOT 79CD AT bellsouth DOT net>
NNTP-Posting-Host:	ppp229.cs.com
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Lester Davis wrote:
> 
> What is the best way to get a time value between events. I'm getting
> ready to interface a sonar system to a pc and need to measure time of
> flight of the sonar. I don't want to use a simple counter. I'm sure
> there is a function that does what I need, any ideas?

clock() (defined in time.h) returns the elapsed time in CLOCKS_PER_SEC
since the first call to clock() in your program.  uclock() (also defined
in time.h) returns the elapsed time in UCLOCKS_PER_SEC since the first
call to uclock() in your program.  clock() is accurate to approximately
1/91 sec., while uclock() has a resolution of 1/1193180 seconds.  Those
constants are also defined in time.h.

Be aware that uclock() may not be 100% accurate under Windows 95,
because it reprograms the system timer.

For more information, see the libc documentation for clock() and
uclock(), and look at the time.h header file.

-- 
---------------------------------------------------------------------
|      John M. Aldrich       |"A competent and self-confident person|
|       aka Fighteer I       | is incapable of jealousy in anything.|
|   mailto:fighteer AT cs DOT com   | Jealousy is invariably a symptom of  |
| http://www.cs.com/fighteer | neurotic insecurity."  - Lazarus Long|
---------------------------------------------------------------------

- Raw text -