From: "Ghalos" <greg AT holdridge7 DOT freeserve DOT co DOT uk>
Newsgroups: comp.os.msdos.djgpp
Subject: Sound DMA
Date: Wed, 22 Dec 1999 11:09:51 -0000
Organization: Customer of Planet Online
Lines: 20
Message-ID: <83qb6n$9ta$1@news7.svr.pol.co.uk>
NNTP-Posting-Host: modem-51.francium.dialup.pol.co.uk
X-Trace: news7.svr.pol.co.uk 945860631 10154 62.136.43.51 (22 Dec 1999 11:03:51 GMT)
NNTP-Posting-Date: 22 Dec 1999 11:03:51 GMT
X-Complaints-To: abuse AT theplanet DOT net
X-Newsreader: Microsoft Outlook Express 4.72.3110.5
X-MimeOLE: Produced By Microsoft MimeOLE V4.72.3110.3
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

I'm trying to get sound working under DJGPP and so I have to figure out how
to use the DMA.   I have managed to get enough info to sort out which ports
to send what to in order to get auto-initialised DMA up and running (32k
buffer, interrupt called every 8k) I have also looked at some example code
and the FAQ....

Now the problem I am having is to get the interrupt written.  I know-ish how
to write interrupt funcitons in general... I have a functioning (and
stable!) keyboard handler BUT this is a bit more difficult.  I have two
buffers... one mixing buffer in protected mode memory and a copy of it for
the DMA buffer in DOS memory... what I want to know is... assuming I have
locked both of these buffers and the handler function.... is it safe to use
functions like memset() and dosmemput() in an interrupt handler.... do I
need to lock them? how do I do it?

thanks a lot,
--
Ghalos - greg AT holdridge7 DOT freeserve DOT co DOT uk