Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!biar!trebor
From: trebor@biar.UUCP (Robert J Woodhead)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Memory, what *REALLY* will relocate/purge heap?
Message-ID: <1004@biar.UUCP>
Date: 30 Dec 89 17:58:03 GMT
References: <5847@sdcc6.ucsd.edu>
Organization: Biar Games, Inc.
Lines: 20
Keywords: Memory, heap zone

ma199at@sdcc6.ucsd.edu (L J Cris) writes:

>What I would have liked for Christmas:
>A real list of routines that will or will not scramble/purge the heap. 

Assume EVERYTHING will change the heap.  Assume that any time you go
withing spitting distance of the ROM, the heap will scramble.  Assume
that EVERY procedure call will muddle it up.  If you use dereferenced
handles of any type, MoveHHi and HLock them without fail, for Woodhead's
Law of Mis-Handling clearly states that:

	``Even if a rom call doesn't mess with the heap at present,
	  it's sure to do it in the future.  Either Apple or a bright
	  INIT writer will patch it in such a way as to screw you.''

-- 
Robert J Woodhead, Biar Games, Inc.   !uunet!biar!trebor | trebor@biar.UUCP
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