Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!rpi!think.com!snorkelwacker.mit.edu!stanford.edu!rutgers!cmcl2!adm!news
From: CDCKAB%EMUVM1.BITNET@cunyvm.cuny.edu ( Karl Brendel)
Newsgroups: comp.lang.pascal
Subject: Re: Defragmenting the heap in TP 5.5
Message-ID: <27116@adm.brl.mil>
Date: 4 Jun 91 23:03:48 GMT
Sender: news@adm.brl.mil
Lines: 48

In article <9106040138.AA07202@lux.sait.edu.au>, et891856@lux.sait.edu.au
  (Anthony Nuttall) wrote:

>I'm in the middle of writing a text windowing unit which uses the
>heap to store overlayed parts of the screen and i'm running into
>problems with heap overflow.  A little investigating with
>breakpoints shows the memavail variable staying pretty constant but
>the maxavail variable dropping all the time, even though the heap
>memory allocated is released later on.
>
>This kind of points to fragmentation of the heap, my question is :
>Is there anyway of defragmenting the heap so my unit doesn't crash ?

I'd suggest that you obtain version 6 or a replacement for the heap
manager. It may not solve all of your problems--but then again, it
might. :)

I saw a presentation on the TEGL graphics library's virtual memory
manager. I believe it is included in their shareware evaluation
package, but not available as a separate product. It might solve
this and other problems.

I see the C version of TEGL listed at SIMTEL:

"PD1:","<MSDOS.C>","TEGLC.ZIP",1,346112,8,901031,"Graphical
windowing toolkit demo (TC/MSC)"

TEGL Systems Corp can be contacted at Suite 780, 789 West Pender
Street, Vancouver, BC, Canada V6C 1H2. Phone +xx 604 669 2577, FAX
+xx 604 688 9530. (xx meaning "I dunno".) Standard disclaimers, of
course.

>"Baldrick, go forth into the streets and announce that Lord
> BlackAdder wishes to sell his house. Percy, just go forth into the
> streets"
>Edmund BlackAdder  , "Money", BlackAdder II

Drop me some email telling me a bit about BlackAdder, if you would,
please.

Cheers--                        --Karl

+====================================================================+
| Karl Brendel                           Centers for Disease Control |
| Internet: CDCKAB@EMUVM1.BITNET         Epidemiology Program Office |
| Bitnet: CDCKAB@EMUVM1                  Atlanta GA  30093       USA |
|                        Home of Epi Info 5.0                        |
+====================================================================+