On Tue, Jan 28, 2014 at 4:42 PM, Kyotaro HORIGUCHI
<horiguchi.kyot...@lab.ntt.co.jp> wrote:
> Hello,
>> Currently there is no way user can keep the dsm
>> segments if he wants for postmaster lifetime, so I
>> have exposed a new API dsm_keep_segment()
>> to implement the same.
> I had a short look on this patch.


>  - DSM implimentation seems divided into generic part (dsm.c) and
>    platform dependent part(dsm_impl.c). This dsm_keep_segment
>    puts WIN32 specific part directly into dms.c. I suppose it'd
>    be better defining DSM_OP_KEEP_SEGMENT and calling dms_impl_op
>    from dms_keep_segment, or something.
>  - Repeated calling of dsm_keep_segment even from different
>    backends creates new (orphan) handles as many as it is called.
>    Simplly invoking this function in some of extensions intending
>    to stick segments might results in so many orphan
>    handles. Something to curb that situation would be needed.

I think the right way to fix above 2 comments is as suggested by Robert.

>  - "Global/PostgreSQL.%u" is the same literal constant with that
>    occurred in dsm_impl_windows. It should be defined as a
>    constant (or a macro).
>  - dms_impl_windows uses errcode_for_dynamic_shared_memory() for
>    ereport and it finally falls down to
>    errcode_for_file_access(). I think it is preferable, maybe.

Okay, will take care of these in new version after your verification
on Windows.

>> The specs and need for this API is already discussed
>> in thread:
>> http://www.postgresql.org/message-id/ca+tgmoakogujqbedgeykysxud9eaidqx77j2_hxzrgfo3hr...@mail.gmail.com
>> I had used dsm_demo (hacked it a bit) module used
>> during initial tests for dsm API's to verify the working on
>> Windows. So one idea could be that I can extend
>> that module to use this new API, so that it can be tested
>> by others as well or if you have any other better way, please
>> do let me know.
> I'll run on windows sooner:-)

Please update me once the verification is done on windows.

With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com

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