Path: utzoo!attcan!uunet!cbmvax!vu-vlsi!mpx1!erik
From: erik@mpx1.UUCP (Erik Murrey)
Newsgroups: comp.unix.wizards
Subject: Re: portable way to do nap()
Summary: 1/10th of a sec is too much!
Message-ID: <550@mpx1.UUCP>
Date: 10 Oct 88 00:29:20 GMT
References: <543@mpx1.UUCP> <12665@ncoast.UUCP>
Organization: MPX Data Systems, Inc.,  Wayne,  Pennsylvania
Lines: 17

In article <12665@ncoast.UUCP>, allbery@ncoast.UUCP (Brandon S. Allbery) writes:
> May I suggest that for both of these, VMIN and VTIME in the tty driver are
> what you should look for?
>
> [example deleted]

This might work reliably at 1200 or 2400 baud, but what happens
above that?  Termio() only allows time values in 1/10 second
increments.  Isn't there a good chance that more than one keystroke
will be received within 1/10th of a second?  At 9600 baud, or 19.2k?
This is why nap() works so well.  It has a HZ resultion, which
is 1/50 of a second on my AT clone, even higher on bigger machines...
-- 
Erik Murrey                            /|   //  /~~~~/  |  /
MPX Data Systems, Inc.                / | / /  /____/   |/
erik@mpx1.UUCP                       /  /  /  /        /|  Data Systems, Inc. 
{spl1,vu-vlsi,bpa}!mpx1!erik        /     /  /       /  |====================