From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andrew Chernow <ac@esilo.com>
Cc: Merlin Moncure <mmoncure@gmail.com>
Cc: Andrew Dunstan <andrew@dunslane.net>
Cc: Alvaro Herrera <alvherre@commandprompt.com>
Cc: Patches (PostgreSQL) <pgsql-patches@postgresql.org>
Subject: Re: libpq object hooks
Date: Thu, 15 May 2008 14:44:14 -0400
Message-ID: <9867.1210877054@sss.pgh.pa.us> (raw)
In-Reply-To: <482C82BA.3090100@esilo.com>
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<482AD896.4000504@dunslane.net>
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<b42b73150805150852m7b3c28fai2d7a4497c84118b2@mail.gmail.com>
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Andrew Chernow <ac@esilo.com> writes:
> Which callback do we use as the key? Currently, none are required (only
> the name was required). We have to choose one callback that must be
> provided.
What? I thought what you wanted back was the void * pointer that had
been registered with a particular callback function. So you use that
callback function. If it's not actually registered, you get a NULL.
> This is what is passed to PQaddObjectHooks, along with a conn:
This is all wrong IMHO, not least because it creates ABI problems if you
want to add another hook type later. Register each hook separately, eg
typedef void (*PGCRHook) (PGconn *conn, void *passthrough);
void PQregisterConnResetHook(PGconn *conn, PQCRHook func, void *passthrough);
... repeat for each possible hook ...
regards, tom lane
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To: pgsql-patches@postgresql.org
Cc: tgl@sss.pgh.pa.us, ac@esilo.com, mmoncure@gmail.com, andrew@dunslane.net, alvherre@commandprompt.com
Subject: Re: libpq object hooks
In-Reply-To: <9867.1210877054@sss.pgh.pa.us>
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