Re: Auxiliary Processes and MyAuxProc - Mailing list pgsql-hackers

From Alvaro Herrera
Subject Re: Auxiliary Processes and MyAuxProc
Date
Msg-id 20200702151117.GA4919@alvherre.pgsql
Whole thread Raw
In response to Re: Auxiliary Processes and MyAuxProc  (Mike Palmiotto <mike.palmiotto@crunchydata.com>)
Responses Re: Auxiliary Processes and MyAuxProc
List pgsql-hackers
On 2020-Mar-26, Mike Palmiotto wrote:

Regarding 0001:

> diff --git a/src/backend/postmaster/subprocess.c b/src/backend/postmaster/subprocess.c
> new file mode 100644
> index 0000000000..3e7a45bf10
> --- /dev/null
> +++ b/src/backend/postmaster/subprocess.c
> @@ -0,0 +1,62 @@
> +/*-------------------------------------------------------------------------
> + *
> + * subprocess.c
> + *
> + * Copyright (c) 2004-2020, PostgreSQL Global Development Group
> + *
> + *
> + * IDENTIFICATION
> + *      src/backend/postmaster/syslogger.c

Wrong file identification.

> +static PgSubprocess process_types[] = {
> +    {
> +        .desc = "checker",
> +        .entrypoint = CheckerModeMain
> +    },
> +    {
...

This array has to match the order in subprocess.h:

> +typedef enum
> +{
> +    NoProcessType = -1,
> +    CheckerType = 0,
> +    BootstrapType,
> +    StartupType,
> +    BgWriterType,
> +    CheckpointerType,
> +    WalWriterType,
> +    WalReceiverType,    /* end of Auxiliary Process Forks */
> +
> +    NUMSUBPROCESSTYPES            /* Must be last! */
> +} SubprocessType;

This sort of thing is messy and unfriendly to maintain.  I suggest we
use the same trick as in cmdtaglist.h and rmgrlist.h; see commits
2f9661311b83 and 5a1cd89f8f4a for examples.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services



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