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From: iverson@cory.Berkeley.EDU.UUCP
Newsgroups: rec.games.hack,comp.sources.bugs
Subject: Re: Help w/ NETHACK & MSC v4.0
Message-ID: <3567@zen.berkeley.edu>
Date: Wed, 2-Sep-87 19:34:09 EDT
Article-I.D.: zen.3567
Posted: Wed Sep  2 19:34:09 1987
Date-Received: Fri, 4-Sep-87 04:36:55 EDT
References: <616@hadron.UUCP> <3470@zen.berkeley.edu> <1079@bsu-cs.UUCP>
Sender: news@zen.berkeley.edu
Reply-To: iverson@cory.Berkeley.EDU.UUCP (Tim Iverson)
Organization: University of California, Berkeley
Lines: 35
Xref: utgpu rec.games.hack:1213 comp.sources.bugs:237

In article <1079@bsu-cs.UUCP> dhesi@bsu-cs.UUCP (Rahul Dhesi) writes:
>In article <3470@zen.berkeley.edu> iverson@cory.Berkeley.EDU.UUCP (Tim 
>Iverson) writes (about setting a stack for hack.exe under MSDOS):
>
>>I tried stacks up to 64k, but I always
>>got the same lack of stack space.  Then I tried smaller stacks - and guess
>>what?  It worked!  The limit is somewhere between 0a00 and 0b00 (a00 works
>>fine, but b00 doesn't).  If someone out there understands exactly why it
>>works with a small stack but not a large one, I'd really like to know.
>
>A lot of things under MS-DOS are measured in units of 16-byte clicks.

Stacks aren't - both using the linker and using exemod, they're measured
in bytes.  Min/Max *paragraphs* (as in exemod) is measured in 16-byte
units.

>Also note that, depending upon the memory model and the options you
>specify to the compiler, the stack may share a segment with static
>(non-stack) data, limiting the stack itself to less than a full
>segment.

Yes!  I just looked at the manual under segements (previously I had
looked at the 'stack' and 'heap' entries, but was not enlightened)
and it states that in *all* models the stack segment is shared with
initialized static and global data.  It also presents ways to change
this using custom memory models, but then states that if you use a
custom model, you'll have to use your own library.  Instead, I set
-Gt 10, which would then put all the init'd data >10 bytes into unique
segements without negating the usefullness of the library.  This
works quite well - thanks Rahul!


- Tim Iverson
  iverson@cory.Berkeley.EDU
  ucbvax!cory!iverson