Andy Fan <zhihui(dot)fan1213(at)gmail(dot)com> wrote:
> I just don't know why shm_mq is designed to single-reader & single-writer.
shm_mq was implemented as a part of infrastructure for parallel query
processing. The leader backend launches multiple parallel workers and sets up
a few queues to communicate with each. One queue is used to send request
(query plan) to the worker, one queue is there to receive data from it, and I
think there's one more queue to receive error messages.
--
Antonin Houska
https://www.cybertec-postgresql.com