Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!apple!claris!wombat
From: wombat@claris.com (Scott Lindsey)
Newsgroups: comp.sys.apple
Subject: Re: deleting DA's from memory
Message-ID: <10220@claris.com>
Date: 30 May 89 18:09:17 GMT
References: <31983@apple.Apple.COM>
Organization: Claris Corporation, Santa Clara CA
Lines: 20

From article <31983@apple.Apple.COM>, by dlyons@Apple.COM (David Lyons):

> Under System Disk 5.0 and later, there are two new Desk Manager calls:
> RemoveCDA and RemoveNDA (just like InstallCDA and InstallNDA, only different).
> These calls remove a DA from the Desk Manager's tables, but they do *not*
> actually remove the DA's code from memory, because there's no safe way to do
> that.  (The DA may have intercepted system vectors or toolbox functions or
> installed heartbeat interrupt tasks, so that freeing up its memory could easily
> crash the system.)

Why couldn't you just send that DA a shutdown, at which point it *should* undo
anything it has done.  Then just unload its segment.  Does the fear of mis-
behaved DA's in this respect prevent it?


-- 
Scott Lindsey     |"Cold and misty morning. I heard a warning borne in the air
Claris Corp.      |    About an age of power when no one had an hour to spare"
ames!claris!wombat| DISCLAIMER: These are not the opinions of Claris, Apple,
wombat@claris.com |    StyleWare, the author, or anyone else living or dead.