| From: | Manfred Spraul <manfred(at)colorfullife(dot)com> |
|---|---|
| To: | Manfred Spraul <manfred(at)colorfullife(dot)com> |
| Cc: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Marc G(dot) Fournier" <scrappy(at)postgresql(dot)org>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [PATCHES] Reorganization of spinlock defines |
| Date: | 2003-09-12 21:30:51 |
| Message-ID: | 3F623B0B.20105@colorfullife.com |
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| Lists: | pgsql-hackers pgsql-patches |
Manfred Spraul wrote:
> Is the Itanium tas implementation correct? I think it should be
> xchg4.aqv instead of just xchg4 - as far as I know a normal atomic
> exchange is is not a memory barrier on Itanium. At least the Linux
> kernel version contains "cmpxchg4.aqv".
Sorry for the noise, I'm wrong:
Itanium automatically uses acquire semantics with xchg.
See top of page 16 on
http://h21007.www2.hp.com/dspp/files/unprotected/itanium/spinlocks.pdf
--
Manfred
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