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Date:	Sat, 31 Aug 2013 19:49:18 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: 20130830, size of shared memory region changed
Message-ID:	<20130831174918.GH21571@calimero.vinschen.de>
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References:	<6EEA8B83-0D67-46CD-8C60-D038BE5E3B97 AT Denis-Excoffier DOT org> <20130831162654 DOT GF21571 AT calimero DOT vinschen DOT de> <20130831172829 DOT GA4786 AT ednor DOT casa DOT cgf DOT cx>
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On Aug 31 13:28, Christopher Faylor wrote:
> On Sat, Aug 31, 2013 at 06:26:54PM +0200, Corinna Vinschen wrote:
> >On Aug 31 14:00, Denis Excoffier wrote:
> >> Hello,
> >>=20
> >> I'm using Cygwin 32 bits. With the 20130830 snapshot i now get many me=
ssages like:
> >> "      x [main] y z shared_info::initialize: size of shared memory reg=
ion changed from 27984 to 21776"
> >>=20
> >> where x, y and z vary,
> >> - x is typically a small integer (most often 2 or 3, but occurrences w=
ere observed of: 4, 5, 8, 27, even 311)
> >> - y is a program name (tcsh, echo, tr, grep, cut, cat, g++, factor...)
> >> - z is a PID
> >>=20
> >> The name "main" and the numbers 27984 and 21776 seem always present.
> >>=20
> >> It seems that each process initialization would generate a message. Ot=
herwise, all seems OK.
> >
> >I can't reproduce this.  The size of the shared_info changed with my
> >tape drive related checkin from 2013-08-26, but your error message
> >points to some older process still running, still using the previous
> >DLL.  Since the shared_info region continues to exist, any newer process
> >using the new DLL will find that its idea of the sizeof shared_info
> >doesn't match what has been noted in shared_info itself.  Nothing else
> >can explain this.
> >
> >What bugs me is that the change to the mtinfo structure (only the size
> >of some members were affected) apparently didn't change the value of
> >CURR_SHARED_MAGIC, but I don't think we can change this short-term.
>=20
> The magic recalculation is pretty crude.  It only detects changes in shar=
ed_info
> itself, not in structures used by shared_info.

The mtinfo structure changed for the first time after its introduction
in 2004.  I guess we can ignore this problem once every 9 years :)


Corinna

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

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