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Message-ID:	<2E7F82FAC1FCD2118E1500A024B3BF907DED3E@exchange.mmp.plzen-city.cz>
From:	Horak Daniel <horak AT mmp DOT plzen-city DOT cz>
To:	"'cygwin AT sourceware DOT cygnus DOT com'" <cygwin AT sourceware DOT cygnus DOT com>,
	Tom Lane <tgl AT sss DOT pgh DOT pa DOT us>
Cc:	"'Joost Kraaijeveld'" <JKraaijeveld AT askesis DOT nl>
Subject:	RE: [HACKERS] backend freezeing on win32 fixed (I hope ;-) )
Date:	Tue, 17 Aug 1999 13:52:43 +0200
MIME-Version:	1.0
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> On Mon, Aug 16, 1999 at 10:07:00AM -0400, Tom Lane wrote:
> >Is it possible that the CygWin environment doesn't have a correct
> >emulation of IPC semaphores, such that a sema allocated by 
> one process
> >(the postmaster) is not available to other procs (the backends)?
> >That would explain preallocation not working --- but if 
> that's it then
> >we have major problems in other places, since the code assumes that a
> >sema once allocated will remain available to later backends.
> 
> We don't have correct emulation of IPC semapahores since they are not
> implemented at all.  I assume that if you're relying on persistent
> semaphores, then some add-on package is being used.

We are using the cygipc library from Ludovic Lange
(http://www.multione.capgemini.fr/tools/pack_ipc/) which is the only
implementation of SysV IPC for Cygwin I know.

			Dan

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