Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ukma!rutgers!att!lzsc!mkg
From: mkg@lzsc.ATT.COM (Marsh Gosnell)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Expanding System Heap
Summary: The sysz resource doesn't work the way you might think
Message-ID: <1170@lzsc.ATT.COM>
Date: 13 Apr 89 15:07:32 GMT
References: <13002@dartvax.Dartmouth.EDU> <28844@apple.Apple.COM>
Distribution: na
Organization: AT&T ISL Lincroft NJ USA
Lines: 13

In article <28844@apple.Apple.COM>, austing@Apple.COM (Glenn L. Austin) writes:
> If you are loading as an INIT, you can use the sysz resource (a longint)
> to request that the System heap be enlarged by that amount, ...

The sysz mechanism ONLY guarantees that the free space in the system heap
equals (or exceeds) your request.  It will increases the size of the system
heap by the amount needed to meet your request-not by the amount of your
request.  If you ask for space you don't use, that free space will count
towards the next INIT's sysz request.

If you want to have free space available later, you must allocate
something into that space to keep it from being reused by another INIT.
  Marsh Gosnell