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Re: iohelp handle_io_release_conch doesn't lock shared page

From: Marcus Brinkmann
Subject: Re: iohelp handle_io_release_conch doesn't lock shared page
Date: Sat, 11 May 2002 22:45:18 +0200
User-agent: Mutt/1.3.28i

On Sat, May 11, 2002 at 04:40:36PM -0400, Roland McGrath wrote:
> AFAIK other systems do not always
> provide this guarantee, e.g. none I'm aware of do for NFS; I don't know
> whether other current systems in fact make the guarantee for disk files.)
> I'm not saying it's not a worthwhile thing to have, but just to put in
> perspective how much hassle and other inefficiencies it might really be worth.

Linux doesn't allow any writes to shared libraries or executables that are
currently running:

ulysses:/bin# LC_ALL=C /bin/sh -c "cat > /bin/bash"
/bin/sh: /bin/bash: Text file busy

For shared libraries, we use MAP_COPY.  Maybe we can use this for
executables, too?

This opinion might be ignorant of any hair that is involved with exec ;)


`Rhubarb is no Egyptian god.' Debian http://www.debian.org brinkmd@debian.org
Marcus Brinkmann              GNU    http://www.gnu.org    marcus@gnu.org

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