| 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: Re: [COMMITTERS] pgsql: Introduce group locking to prevent parallel processes from deadl |
| Date: | 2016-02-17 08:32:55 |
| Message-ID: | 20160217083255.GJ25464@awork2.anarazel.de |
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| Lists: | pgsql-committers pgsql-hackers |
On 2016-02-16 23:33:47 -0500, Tom Lane wrote:
> Yes, exactly. I'm not certain if there are any real platforms where
> a pointer-sized write wouldn't be atomic (it sure sounds inefficient
> for that to be true), but we have not assumed that to date and I'd
> just as soon not start here.
FWIW, there's no sizeof(void*) == 8 platform supported by PG where
aligned 8 byte writes aren't atomic. There are a number of supported
platforms with sizeof(void*) == 4 without atomic 8 byte writes though.
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