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To: cygwin@cygwin.com
From: Achim Gratz <Stromeko@NexGo.DE>
Subject: Re: Process map and fork problems
Date: Wed, 20 Apr 2016 14:29:07 +0000 (UTC)
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References: <loom.20160420T121651-786@post.gmane.org> <20160420104633.GA26118@calimero.vinschen.de> <loom.20160420T124825-644@post.gmane.org> <20160420111431.GB13570@calimero.vinschen.de> <loom.20160420T131743-463@post.gmane.org> <20160420140625.GA25668@calimero.vinschen.de>
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Corinna Vinschen <corinna-cygwin <at> cygwin.com> writes:
> It can't fragment, it can only grow.  The Unix heap management doesn't
> have the notion of multiple application heaps.  There's only the sbrk
> call to raise or shrink the size of the heap.

Thanks for the confirmation.  It looks like I am allowed to migrate the
machines to a 3GB VM, thus circumventing the heap collision with DLL. 
Meanwhile I've looked at some problems that typically happen when loading
emacs-x11 and it turns out that this loads a number of Windows DLL related
to the display drivers and some others related to networking to low
addresses.  The only way I see to get around that is to try to enable ASLR,
so what's the latest on doing that with Cygwin DLL?  As far as I understand
we should then rebase from 0x50000000 down since the range above is used by
ASLR for any DLL that we still need top load to fixed addresses?


Regards,
Achim.


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