Horton

Re: Back-patch use of unnamed POSIX semaphores for Linux?

Peter Eisentraut <peter.eisentraut@2ndquadrant.com>

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From: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-hackers@postgreSQL.org
Date: 2016-12-08T13:34:24Z
Lists: pgsql-hackers 
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

Commits

  1. Make the different Unix-y semaphore implementations ABI-compatible.

  2. Use unnamed POSIX semaphores, if available, on Linux and FreeBSD.