> > [ fix broken CHECK_FOR_INTERRUPTS macro ]
> Applied.  I see how this might change detection of 
> statement_timeout, but I do not actually see what it's got to 
> do with deadlock detection.
> In the deadlock situation the process that needs to wake up 
> is going to be blocked on a semaphore, and so it's not going 
> to be executing CHECK_FOR_INTERRUPTS at all.  How does this 
> fix that case?

It doesn't. This is why the second version of the patch was required,
per http://archives.postgresql.org/pgsql-patches/2004-09/msg00039.php.
It even specifically says this is so it fixes the deadlock issues and
not just statement_timeout :-)


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