Re: Bug in walsender when calling out to do_pg_stop_backup (and others?) - Mailing list pgsql-hackers

From Florian Pflug
Subject Re: Bug in walsender when calling out to do_pg_stop_backup (and others?)
Date
Msg-id 58DF6C4A-A6AF-48F4-ACC4-CA5521FDC82B@phlo.org
Whole thread Raw
In response to Bug in walsender when calling out to do_pg_stop_backup (and others?)  (Magnus Hagander <magnus@hagander.net>)
Responses Re: Bug in walsender when calling out to do_pg_stop_backup (and others?)  (Greg Jaskiewicz <gj@pointblue.com.pl>)
List pgsql-hackers
On Oct19, 2011, at 17:47 , Greg Jaskiewicz wrote:
> On 15 Oct 2011, at 11:31, Florian Pflug wrote:
>>
>> Ok, here's a first cut.
>
> So I looked at the patch, and first thing that pops out,
> is lack of the volatile keyword before the ClientConnectionLostPending variable is defined. Is that done on purpose ?
Isthat on purpose ? 

That's on purpose. volatile is only necessary for variables which are either accessed from within signal handlers or
whichlive in shared memory. Neither is true for ClientConnectionLostPending, so non-volatile should be fine. 

> Otherwise the patch itself looks ok.
> I haven't tested the code, just reviewed the patch itself. And it obviously needs testing, should be easy to follow
youroriginal problem description.  

Yeah, further testing is on my todo list. The interesting case is probably what happens if the connection is dropped
whilethere's already a cancellation request pending. And also the other way around - a cancellation request arriving
afterwe've already discovered that the connection is gone. 

> Btw, I just tried to do it through commitfest.postgresql.org , but before I get my head around on how to add myself
tothe reviewer list there - I thought I'll just send this response here. 

You just need to click "Edit Patch" and put your name into the Reviewer field. You do need a postgres community account
toedit patches, but the signup process is quite quick and painless AFAIR. 

best regards,
Florian Pflug



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