Re: kevent latch paths don't handle postmaster death well

On Thu, Oct 15, 2020 at 8:40 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Thomas Munro <thomas.munro@gmail.com> writes:
> > The process exit event is like an 'edge', not a 'level'... hmm.  It
> > might be enough to set report_postmaster_not_running = true the first
> > time it tells us so if we try to wait again we'll treat it like a
> > level.  I will look into it later today.
>
> Seems like having that be per-WaitEventSet state is also not a great
> idea --- if we detect PM death while waiting on one WES, and then
> wait on another one, it won't work.  A plain process-wide static
> variable would be a better way I bet.

I don't think that's a problem -- the kernel will report the event to
each interested kqueue object.  The attached fixes the problem for me.