Horton

Re: WIP: extensible enums

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Andrew Dunstan <andrew@dunslane.net>, Dean Rasheed <dean.a.rasheed@gmail.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2010-10-24T00:11:11Z
Lists: pgsql-hackers 
Robert Haas <robertmhaas@gmail.com> writes:
> Why would you need to lock out type comparisons?

Didn't you get the point?  The hazard is to a concurrent process that is
merely trying to load up its enum-values cache so that it can perform an
enum comparison.  I don't want such an operation to have to block,
especially not against something that's trying to acquire a more or less
exclusive lock.

			regards, tom lane