Hello. At Mon, 11 Mar 2019 21:37:32 +0800, Andy Fan <zhihui.fan1...@gmail.com> wrote in <caku4awqhzn1v5cr85j74aavxntijwtzy6y-3pbyxqmpl5et...@mail.gmail.com> > notes on the shared hash map: it needs multi writers and multi readers. > > On Mon, Mar 11, 2019 at 9:36 PM Andy Fan <zhihui.fan1...@gmail.com> wrote: > > > Hi: > > I need some function which requires some message exchange among > > different back-ends （connections). > > specially I need a shared hash map and a message queue. > > > > Message queue: it should be many writers, 1 reader. Looks POSIX > > message queue should be OK, but postgre doesn't use it. is there any > > equivalent in PG? > > > > shared hash map: the number of items can be fixed and the value can be > > fixed as well. > > > > any keywords or explanation will be extremely helpful.
I suppose that you are writing an extension or tweaking the core code in C source. dshash (dynamic shared hash) would work for you as shared hash map, and is shm_mq usable as the message queue? -- Kyotaro Horiguchi NTT Open Source Software Center
