given PublicInbox::Config which may be instantiated more than
once in the future.
-* PublicInbox::ParentPipe
+* PublicInbox::EOFpipe
- Per-worker process class to detect shutdown of master process.
- This is not used if using -W0 to disable worker processes
- in public-inbox-httpd or public-inbox-nntpd.
-
- This is a per-worker singleton.
+ Used throughout to trigger a callback when a pipe(7) is closed.
+ This is frequently used to portably detect process exit without
+ relying on a catch-all waitpid(-1, ...) call.