Path: utzoo!utgpu!cunews!bnrgate!brchh104!brchs1!bnr.ca!rice.edu!sun-spots-request
From: jewell@tower-unix.city-poly.ac.uk (Tony Jewell)
Newsgroups: comp.sys.sun
Subject: Timed I/O - How do I do it please ?
Keywords: Miscellaneous
Message-ID: <2645@brchh104.bnr.ca>
Date: 27 Apr 91 00:00:00 GMT
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Organization: Sun-Spots
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Approved: Sun-Spots@rice.edu
X-Original-Date: Tue, 23 Apr 91 11:55:53 BST
X-Sun-Spots-Digest: Volume 10, Issue 91, message 6
X-Note: Submissions: sun-spots@rice.edu, Admin: sun-spots-request@rice.edu

I'm currently in the process of designing a direct to disk recording
system - please bear with me, my C and Unix tend to flounder beyond a
simple system administration level.

To do some simple benchmarks, I'd like to read a 16bit integer from a file
once every 1/48000 seconds. How do I time this - utime doesn't have a low
enough resolution, and I don't understand setitimer. Basically I want to
do the following:

start timer
read integer
check timer
if done within 1/48000 secs
	go back to start
else
	report error
	go back to start

I'm currently using a Sun Sparc 1 running 4.1.1

Thank you in advance for your help.

        Tony Jewell
        JANET:	jewell@uk.ac.clp.unixa
        EARN/Bitnet: jewell@unixa.clp.ac.uk
        EAN:		jewell%clp.unixa@ean-relay.ac.uk