Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!rice!uupsi!sunic!erbe.se!prc
From: prc@erbe.se (Robert Claeson)
Newsgroups: comp.unix.questions
Subject: Re: Sleep time interval
Message-ID: <1990Nov7.205723.11231@erbe.se>
Date: 7 Nov 90 20:57:23 GMT
References: <725@macuni.mqcc.mq.oz>
Organization: ERBE DATA AB, Jakobsberg, Sweden
Lines: 19

In a recent article martin@macadam.mqcs.mq.oz.au (Martin Foord) writes:

>Is the smallest interval of sleep time the integer 1? Is there anyway of
>sleeping from a C program for a smaller period of time ?

In general, yes. But Xenix and System V Release 3.2-4.0 has the "nap()"
function, which allow sub-second sleeps. Some systems has a "usleep()"
function for the same purpose. System V Release 3.0 and 3.1 can be
tricked into doing this with the "poll()" system call, and BSD systems
can be fooled into doing this using the poll-like "select()" system call.

Came to think of it, nap() and usleep() are probably implemented as system
calls on most systems.

-- 
Robert Claeson                  |Reasonable mailers: rclaeson@erbe.se
ERBE DATA AB                    |      Dumb mailers: rclaeson%erbe.se@sunet.se
Jakobsberg, Sweden              |  Perverse mailers: rclaeson%erbe.se@encore.com
Any opinions expressed herein definitely belongs to me and not to my employer.