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X-HELO: calimero.vinschen.de
Date: Wed, 20 Apr 2016 16:41:19 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Process map and fork problems
Message-ID: <20160420144119.GD25668@calimero.vinschen.de>
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References: <loom DOT 20160420T121651-786 AT post DOT gmane DOT org> <20160420104633 DOT GA26118 AT calimero DOT vinschen DOT de> <loom DOT 20160420T124825-644 AT post DOT gmane DOT org> <20160420111431 DOT GB13570 AT calimero DOT vinschen DOT de> <loom DOT 20160420T131743-463 AT post DOT gmane DOT org> <20160420140625 DOT GA25668 AT calimero DOT vinschen DOT de> <loom DOT 20160420T162328-728 AT post DOT gmane DOT org>
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On Apr 20 14:29, Achim Gratz wrote:
> 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.
>=20
> 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.=20
> 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 ASL=
R,
> so what's the latest on doing that with Cygwin DLL?  As far as I understa=
nd
> 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?

ASLR is toxic to fork...


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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