RE: [HACKERS] SIGTERM -> elog(FATAL) -> proc_exit() is probably a bad idea

[Mikheev, Vadim]

> I think we'd be lots better off to abandon the notion that we can exit
> directly from the SIGTERM interrupt handler, and instead treat SIGTERM
> the same way we treat QueryCancel: set a flag that is inspected at
> specific places where we know we are in a good state.
> 
> Comments?

This will be much cleaner.

Vadim