--- Vishnu M Menon <vishnu_m_menon@xxxxxxxxx> wrote:
> Hi,
>
> I am trying to solve this problem: reserve the same
> virtual memory address range in a given set of
> programs so that no addresses falling within this
> range will be used by the processes for any other
> purpose. Later I'll map a shared memory region to
> this
> address using mmap(.) or shmat(.).
>
> My question is: is there a way I can use GCC to
> achieve this VM address reservation? The programs
> are
> fully in my control and are extremely specialized,
> so
> I am at liberty to use techniques sane people would
> balk at.
>
> To give a clearer idea of what I'm getting at,
> reserving 10 MB of memory space might be achieved
> through something like:
>
> char g_MemArray[ 10 * ( 1 << 20 ) ];
>
> int
> main()
> {
> printf("Starts at %p\n", g_MemArray );
> return 0;
> }
>
> But of course, layout of global variables will vary
> from program to program. I am trying to see if
> somehow
> the layout can be specified so that VM addresses are
> guaranteed to be the same.
>
> TIA for the replies. I would also welcome any
> solutions that do not involve gcc, though I realize
> this would be off-topic (for which I apologize in
> advance!).
>
> Regards,
> Vishnu
>
there is an example on the web showing how to do this
on a unix system (it concerns fortran common blocks,
but the concepts are the same).
http://gfortran.info/pmwiki.php?n=CodeSnippets
