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From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT Invalid>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: How can I monitor the amount of free RAM?
Organization: Systematic Software
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Date: Sat, 20 Mar 2004 22:48:27 GMT
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

On 20 Mar 2004 07:38:50 -0800 in comp.os.msdos.djgpp, kantsel AT mail DOT ru
(Anthony) wrote:

>DJ Delorie <dj AT delorie DOT com> wrote in message news:
><200403191751 DOT i2JHp99L022683 AT envy DOT delorie DOT com>...
>> > 1. What memory should I monitor (DOS (below 1MB), upper,...)
>> 
>> Virtual.
>> 
>> > 2. How can do that?
>> 
>> You don't want to monitor free memory, you want to monitor *used*
>> memory (other things on the computer might use memory too).  Most
>> programs can use the sbrk(0) call to ask libc where the top of your
>> memory is.  If it doesn't change, you're not asking for more memory.
>> 
>> The exception is if you choose the "non-moving sbrk" option (nearptr,
>> DMA, etc need this) in which case your memory range is discontiguous
>> and sbrk() moves all over the place during allocation.  But at least
>> you can tell if it changes *at all*.
>
>Thanks, I'll use it. But sill, if I want to know how much memory do I
>have left, how can I?

There's a bunch of new functions giving malloc information, esp.
mallinfo, malloc_debug, mallocmap, in the DJGPP 2.04 beta release, if
you want to go to the effort of installing and trying a beta release. 

-- 
Thanks. Take care, Brian Inglis 	Calgary, Alberta, Canada

Brian DOT Inglis AT CSi DOT com 	(Brian dot Inglis at SystematicSw dot ab dot ca)
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