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.
Thanks. > - 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 -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers