This, what I see in your patch, is sending additional statement to server. 
This adds some unnecessery (especially TCP/IP) latency. gura 

> > I sent such patch fully in Java
> > (http://archives.postgresql.org/pgsql-jdbc/2009-11/msg00010.php),
> > implementing cancellation with Timer and "cancel query" facility of
> > PSQL server,
> 
> Would you like to update it?

I updated patch to latets CVS version, I didn't have time to remove some 
trashes from it.

If something will be wrong with patch, give a feedback.

Kind regards,
Radosław Smogura
http://softperience.pl

Attachment: statemnt_to_20101013.patch.gz
Description: GNU Zip compressed data

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