Re: [Mingw-users] Shared data section in DLL

[Luke D. <cod...@ho...>]

>From: "Francois Ferrand" <fra...@en...>
>To: <min...@li...>
>Subject: [Mingw-users] Shared data section in DLL
>Date: Fri, 20 Jun 2003 22:03:36 +0200
>
>Hi,
>
>Is it possible to have some of the data in the DLL shared between all
>instances of this library ?
>I know it can be done, but I cannot find the details on how to do it with
>MingW...
>Thanks,
>
>--
>Francois Ferrand

See the GCC manual about the "shared" attribute. For example:

int foo __attribute__((section (".shared"), shared)) = 0;

There was a bug with this, so once you have built the DLL you can check it 
using "objdump -h my.dll". You should see your shared section listed 
something like this:

Idx Name          Size      VMA       LMA       File off  Algn
...
  2 .shared       00000004  6abc3000  6abc3000  00000e00  2**2
                  CONTENTS, ALLOC, LOAD, DATA, SHARED

The "SHARED" attribute is the important part.

Luke

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