Re: timeout implementation issues

Tom Lane wrote:
> Bruce Momjian <pgman@candle.pha.pa.us> writes:
> > We do have on_shmem_exit and on_proc_exit function call queues.  Seems
> > we will need SET to create a queue of function calls containing previous
> > values of variables SEt in multi-statement transactions.  If we execute
> > the queue in last-in-first-out order, the variables will be restored
> > properly.
> 
> That's most certainly the hard way.  I was planning to just make GUC
> save a spare copy of the start-of-transaction value of each variable.

Ewe, I was hoping for something with zero overhead for the non-SET case.
Can we trigger the save for the first SET in the transaction?

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