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Re: Cancel/Kill backend functions

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl>
Cc: Neil Conway <neilc(at)samurai(dot)com>,Magnus Hagander <mha(at)sollentuna(dot)net>,Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, pgsql-patches(at)postgresql(dot)org
Subject: Re: Cancel/Kill backend functions
Date: 2004-05-28 05:30:01
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Lists: pgsql-patches
Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl> writes:
> With this comment, I take it you'd disagree with my recoding of
> TransactionIdIsCurrentTransactionId().

> The current code has to scan only the xid's in each PGPROC struct.
> However I had to rewrite it to peek at pg_subtrans, and this is done
> while the SInvalLock is share-locked.  pg_subtrans may need to do some
> I/O to get the data, and there could be multiple queries, depending on
> the nesting level.

You're right, I think that's really awful :-(

			regards, tom lane

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