Michael Paquier <michael.paqu...@gmail.com> writes:
> On Mon, Jun 26, 2017 at 12:12 PM, Craig Ringer <cr...@2ndquadrant.com> wrote:
>> I'm not sure I understand this.

> The patch attached may explain that better. Your patch added 3 poll
> phases. I think that a 4th is needed. At the same time I have found
> cleaner to put the poll calls into a small wrapper.

Looks good as far as it goes, but I wonder whether any of the other
get_slot_xmins calls need polling too.  Don't feel a need to add such
calls until someone exhibits a failure there, but I won't be very
surprised if someone does.

Anyway, pushed this patch with minor editing.  Thanks!

                        regards, tom lane

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