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RE: [HACKERS] backend freezeing on win32 fixed (I hope ;-) )
- To: "'cygwin@sourceware.cygnus.com'" <cygwin@sourceware.cygnus.com>, Tom Lane <tgl@sss.pgh.pa.us>
- Subject: RE: [HACKERS] backend freezeing on win32 fixed (I hope ;-) )
- From: Horak Daniel <horak@mmp.plzen-city.cz>
- Date: Tue, 17 Aug 1999 13:52:43 +0200
- Cc: "'Joost Kraaijeveld'" <JKraaijeveld@askesis.nl>
> 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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