SQL Server 2008 Resource Governor

What does the following function doing ?

I am trying to create Resource Governor in SQL 2008 for A particular Host_name

CREATE FUNCTION fnHostClassifier()
RETURNS sysname
WITH SCHEMABINDING
AS
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       RETURN  host_name()
   END
GO

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the host_name function returns the workstation name. The sql you have creates a UDF that does that.

You can read up on it more here.

If you are trying to work with the Resource Governor, I'd say you're looking in the wrong spot. Start by doing some reading here.