| From: | Magnus Hagander <magnus(at)hagander(dot)net> |
|---|---|
| To: | Trevor Talbot <quension(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Zeugswetter Andreas ADI SD <Andreas(dot)Zeugswetter(at)s-itsolutions(dot)at>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Gregory Stark <stark(at)enterprisedb(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Martijn van Oosterhout <kleptog(at)svana(dot)org>, Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: pgwin32_open returning EINVAL |
| Date: | 2007-12-20 16:01:22 |
| Message-ID: | 20071220160122.GF26753@svr2.hagander.net |
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| Lists: | pgsql-hackers |
On Thu, Dec 20, 2007 at 07:57:23AM -0800, Trevor Talbot wrote:
> > I'd expect the compiler to optimize away those, but I'll make it a var
> > anyawy.
>
> It can't; it's an opaque callout to kernel32.dll, and there's nothing
> that tells the optimizer when you can expect to get the same result.
> That said, it's cheaper than it looks, since the error code is stored
> at a fixed location in thread-specific VM space. I guess it wasn't
> interesting enough to make an MSVC intrinsic instead of keeping it a
> system detail.
Interesting. I was certainly it was an intrinsic, but it seems not...
Variable, it is..
//Magnus
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