[PyGreSQL] [patch] relinquish GIL while connecting to database

[Peter Schuller]

Hello,

> > I'll check that in today if nobody protests.
> 
> Ok, it's in now. Peter, can you check  whether the changes 
> http://www.pygresql.org/cvsweb.cgi/pygresql/module/pgmodule.c?r1=1.79&r2=1.80 
> are ok? Unfortunately, we have no configure script, so it's difficult to 
> check things like the PG major version in compilation conditions. As a 
> workaound, I'm checking against a constant that is new in PG 8.0.

I can confirm that it has the expected effect of disabling the
relinquishing on the legacy sarge installation.

My one input is that depending on KRB4/KRB5 being defined requires
that "postgres.h" is included from the server headers; and it is not
immediately clear to me that it is guaranteed/obvoius that pg_config.h
(or whever it's being picked up) is going to be included indirectly as
a result of this.

To be extra safe, one could remove the KRB4/KRB5 test and just assume
it's dangerous on such old legacy installations.

-- 
/ Peter Schuller

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