From: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-hackers@postgreSQL.org
Subject: Re: Back-patch use of unnamed POSIX semaphores for Linux?
Date: Thu, 8 Dec 2016 08:34:24 -0500
Message-ID: <e501493b-e361-50db-dcb1-24e1402d9444@2ndquadrant.com> (raw)
In-Reply-To: <27169.1481121490@sss.pgh.pa.us>
References: <32387.1481079186@sss.pgh.pa.us>
<722c489e-810a-be9c-f005-3b6bdcb4c59f@2ndquadrant.com>
<27169.1481121490@sss.pgh.pa.us>
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On 12/7/16 9:38 AM, Tom Lane wrote:
>> Even with that change, dynamic shared memory is still vulnerable to be
>> removed.
> Really? I thought we concluded that it is safe because it is detectably
> attached to running processes.
The DSM implementation uses POSIX shared memory, which doesn't have an
attachment count like SysV shared memory.
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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To: pgsql-hackers@postgresql.org
Cc: peter.eisentraut@2ndquadrant.com, tgl@sss.pgh.pa.us
Subject: Re: Back-patch use of unnamed POSIX semaphores for Linux?
In-Reply-To: <e501493b-e361-50db-dcb1-24e1402d9444@2ndquadrant.com>
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