From: fjh AT cs DOT mu DOT OZ DOT AU (Fergus Henderson)
Subject: Re: Global data in DLL's how?
25 May 1998 06:33:57 -0700
Message-ID: <19980525140222.28006.cygnus.gnu-win32@murlibobo.cs.mu.OZ.AU>
References: <199805240344 DOT UAA17250 AT prefetch-atm DOT san DOT rr DOT com>
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To: mlx AT san DOT rr DOT com
Cc: Craig Setera <setera AT us DOT ibm DOT com>, gnu-win32 AT cygnus DOT com

On 23-May-1998, Steve Biskis <mlx AT san DOT rr DOT com> wrote:
> I don't know if the Gnu/Cygnus development environment
> supports this but the MS prescribed way to change the
> default behavior of globals so that they may be shared
> by all attached processes is to add a directive like the
> following to your DLL's entry module:
> 
> #pragma data_seg( ".GLOBALS" )
> int nProcesses =0;
> int nThreads     =0;
> #pragma data_seg()

The gcc equivalent of this would be

	int nProcesses __attribute__((section(".GLOBALS")) = 0;
	int nThreads __attribute__((section(".GLOBALS")) = 0;

However, I have no idea whether this works.

I do know that the technique of using

	#define nProcesses (*__imp_nProcesses)

works.  (This technique is automated if you use my Makefile.DLLs,
see <http://www.cs.mu.oz.au/~fjh/gnu-win32/how-to-build-dlls.html>.)

-- 
Fergus Henderson <fjh AT cs DOT mu DOT oz DOT au>  |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>  |  of excellence is a lethal habit"
PGP: finger fjh AT 128 DOT 250 DOT 37 DOT 3        |     -- the last words of T. S. Garp.
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