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>, pgsql-hackers@postgreSQL.org
Date: 2016-12-07T13:54:17Z
Lists: pgsql-hackers 
On 12/6/16 9:53 PM, Tom Lane wrote:
> I think we should give serious consideration to back-patching commit
> ecb0d20a9, which changed the default semaphore type to unnamed-POSIX
> on Linux.

Even with that change, dynamic shared memory is still vulnerable to be
removed.  So backpatching the semaphore change wouldn't achieve any new
level of safety for users so that we could tell them, "you're good now".

-- 
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.