From:	Vic <tudor AT cam DOT org>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: What does locking memory do?
Date:	Sat, 18 Oct 1997 21:09:14 -0400
Organization:	Communications Accessibles Montreal, Quebec Canada
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Message-ID:	<34495DBA.2CCD@cam.org>
References:	<01bcdc22$9423bc60$b95d29c0 AT worldwii>
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

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.
AFAIK The purpose of locking functions and data is this: You are using a
DPMI server which gives you virtual memory. When you run out of physical
memory the DPMI server starts swapping data to disk. If an interrupt
occurs and the data needed by  the interrupt code is swapped to disk,
DOS will die. Locking keeps your data from being swapped. 
> Could not locking be the reason my program keeps crashing on my blit code?
> It sometimes works and sometimes doesn't...
Does it SIGSEGV? Cause then you are writing off the screen boundaries...
-- 
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