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From: dan@lclark.UUCP (Dan Revel)
Newsgroups: comp.sys.mac.programmer
Subject: SetApplLimit (how big a stack do I need?)
Keywords: stack SetApplLimit
Message-ID: <1038@lclark.UUCP>
Date: 3 Jan 91 23:28:00 GMT
Reply-To: dan@lclark.UUCP (Dan Revel)
Organization: Lewis & Clark College, Portland OR
Lines: 42

I'm using SetApplLimit to set the stack size in my program as follows:

#define STACKSIZE	8192L

Ptr
GetSP()
{
	register Ptr	localSP;

	asm {
		movea.l sp,localSP
	};
	return(localSP);
}

InitMemory()
{
	Ptr	localSP;

	localSP = GetSP();
	SetApplLimit(localSP - STACKSIZE);
	MaxApplZone();

	/* ... etc. ... */
}

I'm pretty sure that this is the 'right' way to do it (I saw it on
comp.sys.mac.programmer :-)), but my application still gets a
system error 28 every now and then.
(system error 28 = dsStknHeap stack has moved into application heap)
So my question is: aside from trial and error how can I judge how large
a stack my application will need?  My guess was that 8K was more than
for any possible case... wrong!  So tell me does the operating system
or the toolbox or Think C 4.0 have an appetite for stack space I don't
know about or what?!

Thanks in advance,

Dan
-- 
dan@lclark.bitnet					SM 0 A9F4
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