Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!pasteur!ames!apple!dlyons
From: dlyons@Apple.COM (David Lyons)
Newsgroups: comp.sys.apple
Subject: Re: deleting DA's from memory
Message-ID: <32081@apple.Apple.COM>
Date: 31 May 89 18:23:53 GMT
References: <31991@apple.Apple.COM> <10221@claris.com>
Organization: Apple Computer Inc, Cupertino, CA
Lines: 39

In article <10221@claris.com> wombat@claris.com (Scott Lindsey) writes:
[...]
>Only "sensible" alternative to *automatically* install itself, that is.  It
>could, of course, require that you turn it on manually through the CDA menu...

Yup, that's what I meant.

>And the Toolbox Reference *does* say "The second entry point is necessary
>because CDAs can spawn background tasks that rely on the availability of the
>current ProDOS.  The shutdown routine allows the CDA to stop the tasks."

True.  But it doesn't say that's the *only* use for the shutdown routine, or
that background tasks should *always* be stopped.

>And NDA's *should* get their grubby fingers out of the system on a ShutDown.

Well...I don't think that that's specified clearly anywhere.  But as soon as
5.0 is out, there's nothing stopping 3rd parties from writing a utility that
calls RemoveNDA on an NDA's main handle and then calls UserShutdown on its ID.

I just realized there's no wonderfully straightforward way to get a list of
all the handles appropriate for use with RemoveNDA/RemoveCDA.

I guess you have to call GetLoadSegInfo on memory IDs in the $50xx range, and
then use FindHandle to get the handle for the first segment.

>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.

 --Dave Lyons, Apple Computer, Inc.          |   DAL Systems
   AppleLink--Apple Edition: DAVE.LYONS      |   P.O. Box 875
   AppleLink--Personal Edition: Dave Lyons   |   Cupertino, CA 95015-0875
   GEnie: D.LYONS2 or DAVE.LYONS         CompuServe: 72177,3233
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   My opinions are my own, not Apple's.