TZUTC: -0700
MSGID: 58762.sync_sys@1:103/705 2d6309cb
PID: Synchronet 3.21a-Linux master/88b423313 Sep 29 2025 GCC 12.2.0
TID: SBBSecho 3.30-Linux master/88b423313 Sep 29 2025 GCC 12.2.0
BBSID: VERT
CHRS: UTF-8 4
FORMAT: flowed
open https://gitlab.synchro.net/main/sbbs/-/issues/998

It would be nice to be able to group external programs into a mutually
exclusive group.

The Clans is a single-node door, and there's two extra events that need to be
configured for it, maintenance via `clans /m` and interbbs processing via
`clans /i`.

While `CLANSMAINT` is easy enough to accommodate by making it exclusive,
`CLANSIBBS` isn't so simple... I want it to run as soon as possible after a
packet file is received, and would like to have a semaphore kick it off.

So, being able to make the door `CLANS`, and the two timed events `CLANSMAINT`
and `CLANSIBBS` part of an exclusive group where only one can run at a time
and they'll all wait until the others are complete before starting would
really make this easy.

For The Clans specifically, I plan to add support to do this using the
"online" file semaphore it uses to protect against multiple nodes running the
door, but it would be nice if Synchronet had this itself for any other similar
doors.
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