Re: BackendPidGetProc doesn't return PGPROC for background worker?

From: Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>
To: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: BackendPidGetProc doesn't return PGPROC for background worker?
Date: 2015-05-15 01:39:48
Message-ID: 55554E64.8060701@lab.ntt.co.jp
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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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