| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Back-patch use of unnamed POSIX semaphores for Linux? |
| Date: | 2016-12-07 22:51:21 |
| Message-ID: | 20161207225121.ddnoo7bi6mw7yd3g@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
On 2016-12-06 23:54:43 -0500, Tom Lane wrote:
> You're attacking a straw man. I didn't propose changing our behavior
> anywhere but Linux. AFAIK, on that platform unnamed POSIX semaphores
> are futexes, which have been a stable feature since 2003 according to
> https://en.wikipedia.org/wiki/Futex#History. Anybody who did need
> to compile PG for use with a pre-2.6 kernel could override the default,
> anyway.
Back then futexes weren't "robust" though (crash handling and such was
unusable). They only started to be reliable in the ~2007-2008 frame
IIRC. That still should be ok though.
Regards,
Andres
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