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From: Chris Faylor <cgf AT cygnus DOT com>
Date: Mon, 16 Aug 1999 13:09:49 -0400
To: Tom Lane <tgl AT sss DOT pgh DOT pa DOT us>
Cc: Horak Daniel <horak AT mmp DOT plzen-city DOT cz>,
        "'pgsql-hackers AT postgreSQL DOT org'" <pgsql-hackers AT postgreSQL DOT org>,
        "'cygwin AT sourceware DOT cygnus DOT com'" <cygwin AT sourceware DOT cygnus DOT com>,
        "'Joost Kraaijeveld'" <JKraaijeveld AT askesis DOT nl>
Subject: Re: [HACKERS] backend freezeing on win32 fixed (I hope ;-) )
Message-ID: <19990816130949.A1087@cygnus.com>
Reply-To: cygwin AT sourceware DOT cygnus DOT com
Mail-Followup-To: Tom Lane <tgl AT sss DOT pgh DOT pa DOT us>,
	Horak Daniel <horak AT mmp DOT plzen-city DOT cz>,
	"'pgsql-hackers AT postgreSQL DOT org'" <pgsql-hackers AT postgreSQL DOT org>,
	"'cygwin AT sourceware DOT cygnus DOT com'" <cygwin AT sourceware DOT cygnus DOT com>,
	'Joost Kraaijeveld' <JKraaijeveld AT askesis DOT nl>
References: <2E7F82FAC1FCD2118E1500A024B3BF907DED3B AT exchange DOT mmp DOT plzen-city DOT cz> <601 DOT 934812420 AT sss DOT pgh DOT pa DOT us>
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In-Reply-To: <601.934812420@sss.pgh.pa.us>; from Tom Lane on Mon, Aug 16, 1999 at 10:07:00AM -0400

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.

cgf

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