From: "H.W. Stockman" <hwstock AT swcp DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: What does locking memory do?
Date: Sat, 18 Oct 1997 19:25:16 -0600
Organization: Lentil Sorbet, Inc.
Lines: 16
Message-ID: <3449617C.7C08@swcp.com>
References: <01bcdc22$9423bc60$b95d29c0 AT worldwii>
Reply-To: hwstock AT swcp DOT com
NNTP-Posting-Host: pm2-24.swcp.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Precedence: bulk

Dave wrote:
> 
> What is the purpose of locking memory?  I am new to 32 bit programming, and
> I saw the  locking functions and have heard of them being used, and I am
> curious.

I haven't used locking functions in a while, but typically
they were used for (e.g.) the mouse interface in extended
DOS graphics applications, when the app was running under
virtual memory.  There are certain DOS services that can't
be swapped to disk, or relocated in memory, if you want
reliable behavior (for that manner, non-termination).  An
example would be: an extended DOS app run under Windows;
without locking the memory associated with the cursor
bitmap and the function itself, merely moving the graphics
cursor could trash the program.