From: B Hodge <bhodge AT gpu DOT srv DOT ualberta DOT ca>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: DMA under djgpp
Date: 14 Feb 1998 00:02:43 GMT
Organization: University of Alberta
Lines: 26
Message-ID: <6c2mv3$vkk$1@pulp.ucs.ualberta.ca>
References: <199802130639 DOT WAA14453 AT adit DOT ap DOT net> <6c0u42$b92$1 AT pulp DOT ucs DOT ualberta DOT ca> <6c1n5t$4di$3 AT antares DOT lu DOT erisoft DOT se>
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To: djgpp AT delorie DOT com
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Martin Stromberg <Martin DOT Stromberg AT lu DOT erisoft DOT se> wrote:

> [ Klippa, klapp, kluppit excellent method to allocate DMA buffer. ]

I try. :)

I started using a stack implementation, but then I started using a
recursive implementation instead.  Recursion simplified everything as the
buffer's pointer is stored on the program's stack, so the function doesn't
require a stack of pointers to keep track of everything.  Since you only
allocated the DMA buffer once at startup and not in any loops, recursion
works great, speed ain't an issue.

Alloc.  If it failed, can't be done.  If it is good, use it.  Otherwise
try again then free the bad buffer.  Simple really, and no wasted memory. 
:)

Blaine Hodge

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