Re: Auxiliary Processes and MyAuxProc

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