Subj : src/doors/UNIFIED_MP_LOBBY_DESIGN.md
To   : Git commit to main/sbbs/master
From : Rob Swindell (on Debian Linux)
Date : Fri Jul 03 2026 18:20:46

https://gitlab.synchro.net/main/sbbs/-/commit/b0b5c5a4807d204252d4b2e9
Added Files:
	src/doors/UNIFIED_MP_LOBBY_DESIGN.md
Log Message:
SyncDOOM/SyncDuke: design for unified [M]ultiplayer lobby entry

Design doc for merging the lobby's [J]oin and [C]reate keys into a single
[M]ultiplayer option in both doors: a sequential Y/N flow keyed on the count of
waiting games (0/1/>=2), a short-lived file_mutex setup-window lock (~120s
stale-reap) that funnels a second arrival into joining the game the first is
forming (with a waiter poll that auto-drops into the join prompt), external-by-
address folded in only when [net] allow_external is on (SyncDOOM), and shared
gl.* helpers with each door's existing join/create internals untouched. Unifying
the muster-vs-claim waiting-room models is explicitly out of scope.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KYmBzSZGyRondAXevh9RJP

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