Path: utzoo!utgpu!watmath!clyde!att!ulysses!andante!mit-eddie!bloom-beacon!apple!parent
From: parent@Apple.COM (Sean Parent)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Stack manipulation problems
Summary: stack sniffer still exists
Message-ID: <23591@apple.Apple.COM>
Date: 9 Jan 89 18:03:17 GMT
References: <ebmyn#1CMsZI=bob@xanadu.COM> <275@berlin.acss.umn.edu> <13322@cup.portal.com>
Organization: Apple Computer Inc., Cupertino, CA
Lines: 18

In article <13322@cup.portal.com>, ts@cup.portal.com (Tim W Smith) writes:
> Is the stack sniffer still around?  I was developing a simple multitasking

> development system ).  There were several stacks in my heap area.

> But I definitely forgot about the stack sniffer.  I did not disable it.
> Yet, I got no bombs.  What's going on?

I am not sure but a believe that that stack sniffer looks for the top of the
heap to be overwritten when the SP is out of range. I do know that you do not
need to worry about the stack sniffer if you are using A7 to manage your own
stacks. Lot's of software uses A7 as just another address register for things
like fast blitters.

Note - You should not try to use QD while you are operating with an alternate
stack there are major problems with doing so. (see other articles for more info)

Sean