Bruce Momjian wrote:

> I have a idea --- to have pg_terminate_backend() set a PGPROC boolean
> and then send a query cancel signal to the backend --- the backend can
> then check the boolean and exit if required.  I will work on a new
> version of this patch tomorrow/Monday.

That's fine, even if it fails on 0.1% of the cases, but you can't use
SIGTERM to implement that because it already has a different meaning.

Alvaro Herrera                      
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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