Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!henry!hairston
From: hairston@henry.ece.cmu.edu (David Hairston)
Newsgroups: comp.sys.mac.programmer
Subject: Re: SetApplLimit (how big a stack do I need?)
Message-ID: <HAIRSTON.91Jan8200201@henry.ece.cmu.edu>
Date: 9 Jan 91 01:02:01 GMT
References: <1038@lclark.UUCP>
Organization: Gaia II
Lines: 45
In-reply-to: dan@lclark.UUCP's message of 3 Jan 91 23:28:00 GMT

[dan@lclark.UUCP (Dan Revel) writes:]
[] 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.

is this equivalent to:

    SetAppLimit(ApplLimit - STACKSIZE);
    MaxApplZone();
    ... 

where ApplLimit is the global assumed to be equal to the result
returned by GetApplLimit() ? (Ref. IM, Vol II, Memory Manager)
The above code fragment clearly adds 8k to the stack space (okay,
i need to brush up on assembly since i don't read it well, yet.
even the simple stuff like movea.l sp, localSP gives me hives).

  -dave-  
hairston@henry.ece.cmu.edu