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Re: [PATCH] "could not reattach to shared memory" on Windows

From: Magnus Hagander <magnus(at)hagander(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Tsutomu Yamada <tsutomu(at)sraoss(dot)co(dot)jp>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, pgsql-hackers(at)postgresql(dot)org, Dave Page <dpage(at)pgadmin(dot)org>
Subject: Re: [PATCH] "could not reattach to shared memory" on Windows
Date: 2009-08-11 15:14:08
Message-ID: 9837222c0908110814n414b2fcbxcaf7c0e1fcc05999@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Tue, Aug 11, 2009 at 16:30, Magnus Hagander<magnus(at)hagander(dot)net> wrote:
> On Mon, Aug 10, 2009 at 19:33, Magnus Hagander<magnus(at)hagander(dot)net> wrote:
>> On Mon, Aug 10, 2009 at 16:58, Tom Lane<tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>>> Magnus Hagander <magnus(at)hagander(dot)net> writes:
>>>> On Mon, Aug 10, 2009 at 16:10, Tom Lane<tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>>>>> 8.2 as well, no?
>>>
>>>> 8.2 has a different shmem implementation - the one that emulates sysv
>>>> shmem. The patch will need to be changed around for that, and I
>>>> haven't looked at that. It may be worthwhile to do that, but it's a
>>>> separate patch, so let's get it out in 8.3 and 8.4 first.
>>>
>>> If it's at all hard to do, I could see deprecating 8.2 for Windows
>>> instead.
>>
>> I haven't looked at how much work it would be at all yet. So let's do
>> that before we decide to deprecate anything. As mentioned downthread,
>> 8.2 is a very widespread release, and we really want to avoid
>> deprecating it.
>
> Here's an attempt at a backport to 8.2. I haven't examined it  in
> detail, but it passes "make check" on mingw.
>
> Comments?

I've also built a binary that should be copy:able on top of an 8.2.13
installation made from the standard installer, to test this feature.
Anybody on 8.2 on Windows, please give it a shot and let us know how
it works.

http://www.hagander.net/pgsql/postgres_exe_virtualalloc_8_2.zip


-- 
 Magnus Hagander
 Me: http://www.hagander.net/
 Work: http://www.redpill-linpro.com/

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