Xref: utzoo comp.lang.c:13833 comp.unix.questions:10070
Path: utzoo!utgpu!attcan!uunet!auspex!guy
From: guy@auspex.UUCP (Guy Harris)
Newsgroups: comp.lang.c,comp.unix.questions
Subject: Re: Delay for a fraction of a second in C
Message-ID: <399@auspex.UUCP>
Date: 4 Nov 88 17:51:09 GMT
References: <2804@ingr.UUCP> <965@goofy.megatest.UUCP>
Reply-To: guy@auspex.UUCP (Guy Harris)
Followup-To: comp.unix.questions
Organization: Auspex Systems, Santa Clara
Lines: 13

>Pour yourself a cup of strong coffee, then try the following:

And watch it fail to compile on many systems.

Unfortunately, neither "select" nor "setitimer" exist on all UNIX
systems.  (They also tend not to exist on non-UNIX systems, which is why
this discussion is getting sent back to comp.unix.questions, where it
belongs.)

However, you can use "poll" instead of "select" on System V Release 3,
so at least there you can block for an amount of time < 1 second
(although there still isn't a way to get a signal delivered after an
interval of < 1 second in vanilla S5R3).