DosSubFreeMem(): Coalesces Contiguous Blocks?

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2 total messages Started by Keith Bennett Wed, 15 May 1996 00:00

#159

Author: Keith Bennett
Date: Wed, 15 May 1996 00:00

20 lines
1150 bytes

This message pertains to DosSubFreeMem() and related functions.

When it frees a block, does it join together contiguous free areas of
memory?

We're getting a problem where we're running out of memory prematurely.

In general, is the algorithm for allocating and freeing fairly
intelligent?

Thanks for any help.

- Keith

-- 
--------------------------------------------------------------------------
Keith Bennett                             Bennett Business Solutions, Inc.
Silver Spring, MD USA                     OS/2 & DOS Software Development
kbennett@cpcug.org                        (301) 871-7696

Re: DosSubFreeMem(): Coalesces Contiguous Blocks?

#161

Author: Thierry de Montaudry
Date: Fri, 17 May 1996 00:00

26 lines
1604 bytes

In <4ndid4$d0m@cpcug.org>, kbennett@cpcug.org (Keith Bennett) writes:
>This message pertains to DosSubFreeMem() and related functions.
>
>When it frees a block, does it join together contiguous free areas of
>memory?
>
>We're getting a problem where we're running out of memory prematurely.
>
>In general, is the algorithm for allocating and freeing fairly
>intelligent?
>
As much as I've used it, the best way to use DosSub... function is to allocate
a big memory buffer (more than one meg) as uncommited memory, and let
DosSub... functions manage it. What ever you allocate will be commited as it
is needed. As far as I know, if you free a memory a block, the function won't
shrink any memory (it cannot change the address of the already allocated
blocks), but it will uncommit blocks of memory that are not in use
anymore (if you used DosSetMem with the option DOSSUB_SPARSE_OBJ).

	Thierry

/------------------------------
Thierry de Montaudry
thierry@absa.co.za
thierry@solo.pipex.co.za

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