Re: pgsql: Make archiver process an auxiliary process.

On 2021/06/16 13:29, Fujii Masao wrote:
>
>
> On 2021/06/12 19:36, Thomas Munro wrote:
>> On Mon, Mar 15, 2021 at 5:14 PM Fujii Masao <fujii(at)postgresql(dot)org> wrote:
>>> Make archiver process an auxiliary process.
>>>
>>> This commit changes WAL archiver process so that it's treated as
>>> an auxiliary process and can use shared memory. This is an infrastructure
>>> patch required for upcoming shared-memory based stats collector patch
>>> series. These patch series basically need any processes including archiver
>>> that can report the statistics to access to shared memory. Since this patch
>>> itself is useful to simplify the code and when users monitor the status of
>>> archiver, it's committed separately in advance.
>>
>> I think this needs to handle ProcSignalBarrierPending.  Otherwise,
>> code that tries to use proc signal barriers (like CF #2962 and #2602)
>> might hang forever when an archiver is running.
>
> Thanks for the comment! I will investigate this.

Attached patch changes archiver so that it also handles barrier events.

Regards,

--
Fujii Masao
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION