Re: BackendPidGetProc doesn't return PGPROC for background worker? - Mailing list pgsql-hackers

From Amit Langote
Subject Re: BackendPidGetProc doesn't return PGPROC for background worker?
Date
Msg-id 55554E64.8060701@lab.ntt.co.jp
Whole thread Raw
In response to BackendPidGetProc doesn't return PGPROC for background worker?  (Pavel Stehule <pavel.stehule@gmail.com>)
Responses Re: BackendPidGetProc doesn't return PGPROC for background worker?  (Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>)
Re: BackendPidGetProc doesn't return PGPROC for background worker?  (Pavel Stehule <pavel.stehule@gmail.com>)
List pgsql-hackers
On 2015-05-15 AM 05:01, Pavel Stehule wrote:
> 
> I am trying to start bgworker from bgworker and create communication
> between these process. I have a code based on test_shm_mq. This code fails
> because BackendPidGetProc doesn't find related bgworker process, although
> the registrant process is living
> 

One reason for this may be that the worker was not started with the flag
BGWORKER_SHMEM_ACCESS which is necessary to perform InitProcess() that would
initialize a PGPROC entry for it. But if you'd used the same method for
initializing workers as test_shm_mq_setup(), then it should have.

Thanks,
Amit





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