I'm late to this thread, but maybe we can make the process of storing
the new data in pg_class take a lock using LockObject() or something
like that to serialize the access to the pg_class row. The idea would
be that this lock doesn't conflict with a LockRelation(), but it would
of course conflict with itself so no two CREATE INDEXES can enter that
code section concurrently.
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
