Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84; site brl-tgr.ARPA
Path: utzoo!linus!philabs!cmcl2!seismo!brl-tgr!gwyn
From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>)
Newsgroups: net.unix-wizards
Subject: Re: sub-second sleeps on BSD 4.2
Message-ID: <10186@brl-tgr.ARPA>
Date: Wed, 24-Apr-85 13:27:16 EST
Article-I.D.: brl-tgr.10186
Posted: Wed Apr 24 13:27:16 1985
Date-Received: Fri, 26-Apr-85 22:16:45 EST
References: <408@psivax.UUCP>
Organization: Ballistic Research Lab
Lines: 13

> void nullfunc(){
>     wakeup = 1;
> }
> ...
>     signal(SIGALRM, nullfunc);
Sometimes the signal will fire HERE, ...
>     wakeup = 0;
>     if(setitimer(ITIMER_REAL, &tm, NULL)) exit(1);
>     while(wakeup == 0) sigpause(0);
... so you won't see it here.

The simplest way to get sub-second naps on 4.2BSD is to
do a select() specifying no file descriptors and a small timeout.