Server admin for Clients ?

What does Postgres have for managing/controlling user access to the DB in terms of resource allocation? I remember in Oracle, you could specify how many server slots were available for users to share and how much resources they were allotted. A super-user that needed more resource for heavy loading (for example) could be given a private slot with more resources allocated to that slot.

What I have is a user who has fired off 6 resource intensive reports that are bogging my DB down. In the meantime, I have what I would like to identify as a high priority DB loader process (running as a super user BTW) that is bogged down trying to load the DB. So the high priority job is just 1 out of 7 contenders for the DB. I'd like it to be more like the DB loader gets 50% of the resources while the reports get 50% altogether.

Can this be controlled in PG?

Thanks.
-dave