Rename StartBackgroundWorker() to BackgroundWorkerMain().
The comment claimed that it is "called from postmaster", but it is
actually called in the child process, pretty early in the process
initialization. I guess you could interpret "called from postmaster"
to mean that, but it seems wrong to me. Rename the function to be
consistent with other functions with similar role.
Reviewed-by: Thomas Munro
Discussion: https://www.postgresql.org/message-id/
4f95c1fc-ad3c-7974-3a8c-
6faa3931804c@iki.fi