Path: utzoo!attcan!uunet!cs.utexas.edu!sun-barr!apple!well!brecher
From: brecher@well.UUCP (Steve Brecher)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Moving resources into the system file
Message-ID: <12856@well.UUCP>
Date: 25 Jul 89 20:00:07 GMT
References: <1230@uvm-gen.UUCP> <8065@hoptoad.uucp> <12810@well.UUCP> <8102@hoptoad.uucp>
Reply-To: brecher@well.UUCP (Steve Brecher)
Distribution: na
Organization: Software Supply, Sunnyvale, CA
Lines: 24


In article <8102@hoptoad.uucp>, tim@hoptoad.uucp (Tim Maroney) writes:

> So perhaps under MultiFinder all resources in the system file are read
> into the system heap whether they have the system heap bit set or not.

Correct.  This applies also to resources in suitcase files opened with
Suitcase II.

> So, the original questioner could do a ReleaseResource as I suggested,
> but a better approach would be to allocate the resource storage in the
> system heap before adding it to the system file.  Then the
> ReleaseResource becomes unneccessary.

Allocating the resource storage in the system heap would have avoided the
dangling-handle problem even if ReleaseResource were not called.  But
omitting ReleaseResource would introduce another problem:  heap clogging.  If
not ReleaseResource, then HPurge would be required to avoid possible heap
overflow.  Further, one has better control over application heap management
than system heap management, so I think that the original approach, with
ReleaseResource added, is the best solution.
-- 

brecher@well.UUCP (Steve Brecher)