On 11/03/2019 18:36, Andy Fan 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.
You may use shm_mq (shared memory queue) and hash tables (dynahash.c) in
shared memory (see ShmemInitHash() + shmem_startup_hook)
>
> Thanks
--
Andrey Lepikhov
Postgres Professional
https://postgrespro.com
The Russian Postgres Company