From:	Shawn Hargreaves <Shawn AT talula DOT demon DOT co DOT uk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Locking entire program in memory?
Date:	Sat, 8 Mar 1997 21:33:45 +0000
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Matthew Kennedy writes:
>I've got a sophisticated 'real-time' program (with lots of ISR hooking
>etc) and I'd like to lock the ENTIRE program (code,data - everthing) out
>of virtual memory disk swaps.  How can I perform this?  Currently I only
>lock out the code/data that is critical - but I can't lock out the other
>libraries like standard I/O.

Somewhere in your program, add a global variable:

#include <crt0.h>

int _crt0_startup_flags = _CRT0_FLAG_NONMOVE_SBRK | 
                          _CRT0_FLAG_LOCK_MEMORY;

Look in crt0.h for details about this: there are a lot of other handy
flags that you can set in this way, to control the behaviour of the
startup code and library routines.

Whether locking the entire program is a good move, though, I tend to
doubt. It isn't a very polite way to behave, if it is going to be run
under a multitasking OS :-)


/*
 *  Shawn Hargreaves - shawn AT talula DOT demon DOT co DOT uk - http://www.talula.demon.co.uk/
 *  Beauty is a French phonetic corruption of a short cloth neck ornament.
 */

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