Re: Suggestions on message transfer among backends

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