Re: Win32 Thread safetyness

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Magnus Hagander <mha(at)sollentuna(dot)net>, Dave Page <dpage(at)vale-housing(dot)co(dot)uk>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Win32 Thread safetyness
Date: 2005-08-28 21:58:20
Message-ID: 200508282158.j7SLwKo28790@candle.pha.pa.us
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Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > Magnus Hagander wrote:
> >>> Also, there doesn't seem to be a good way for users to know
> >>> if libpq or ecpg was compiled to be thread-safe.
> >>
> >> Right. A runtime function for this might be a good thing? Like "bool
> >> PQisThreadSafe()" or such?
>
> > Yes, and a flag to ecpg. Added to TODO:
>
> Um, it's not clear *when* you need to know this:
> - application configure time?
> - application compile time?
> - application link time?
> - application run time?
>
> Of those possibilities, "add a function" responds to only one, and it's
> the one I can see least use-case for. I should think that by run-time
> it's probably too late to do much about it other than fail.

Yea, I am thinking a libpq function would say "libpq not thread-safe'
and return an error. I would think pg_config output would be fine for
any link or compile-time check.

> You can find out whether thread-safety was mentioned in our configure
> settings by looking at the result of pg_config --configure. This might
> be enough for the find-out-at-configure-time case.

True.

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