Andres Freund писал 2018-03-02 03:47:
On 2018-02-02 19:41:37 +0000, Simon Riggs wrote:
On 2 February 2018 at 18:46, Robert Haas <> wrote:
> On Fri, Feb 2, 2018 at 3:46 AM, Simon Riggs <> wrote:
>> In PG11, I propose the following command, sticking mostly to Ants'
>> syntax, and allowing to wait for multiple events before it returns. It
>> doesn't hold snapshot and will not get cancelled by Hot Standby.
>> WAIT FOR event [, event ...] options
>> event is
>> LSN value
>> TIMESTAMP value
>> options
>> TIMEOUT delay
>> UNTIL TIMESTAMP timestamp
>> (we have both, so people don't need to do math, they can use whichever
>> they have)
> WAIT FOR TIMEOUT sounds a lot like SELECT pg_sleep_for(), and WAIT
> UNTIL TIMESTAMP sounds a lot like SELECT pg_sleep_until().

Yes, it sounds very similar. It's the behavior that differs; I read
and agreed with yours and Thomas' earlier comments on that point.

As pointed out upthread, the key difference is whether it gets
cancelled on Hot Standby and whether you can call it in a non-READ
COMMITTED transaction.

Given that nobody has updated the patch or even discussed doing so, I
assume this would CF issue should now appropriately be classified as
returned with feedback?

Hello, I now is preparing the patch over syntax that Simon offered. And in few day I will update the patch.
Thank you for your interest in thread.

Ivan Kartyshov
Postgres Professional:
The Russian Postgres Company

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