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feat(host): concurrent punktfunk/1 sessions (bounded by --max-concurrent)
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The accept loop no longer awaits each session inline — it spawns each onto a
JoinSet, bounded by a semaphore (--max-concurrent, default 4: a NVENC session
bound; overflow clients wait in QUIC's accept backlog until a slot frees). The
QUIC handshake stays in the accept loop so a failed handshake (e.g. a pin
mismatch where the client aborts) doesn't consume a session slot or block
accepting the next client; the slow part (control handshake, pairing, the
capture/encode pipeline) runs in the spawned task.

Each session already had its own virtual output + NVENC encoder; the
host-lifetime input/audio/mic services stay shared — the natural "multiple
devices viewing/controlling the same desktop" semantic on kwin/mutter/wlroots.
gamescope's independent-desktops (per-session input/audio) isolation is a
follow-up. New M3Options.max_concurrent + the `--max-concurrent` CLI flag.

Validated live (GNOME box): two clients connected at once -> two independent
Mutter virtual outputs (720p60 + 1080p60) streaming simultaneously (39 MB +
48 MB). All 61 host tests green (the c_abi/pairing tests exercise the new loop +
the failed-handshake-doesn't-count semantics).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Enrico Bühler
2026-06-12 12:42:09 +00:00
parent 47a69a0063
commit 94552331ef
3 changed files with 94 additions and 26 deletions
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@@ -29,6 +29,14 @@ All three appliances advertise over mDNS (`_punktfunk._udp`) and require PIN pai
## Progress log
### 2026-06-12
- **Concurrent sessions** — the host no longer serves one client at a time. The accept loop spawns
each session (`JoinSet`), bounded by `--max-concurrent` (default 4, a NVENC bound; overflow waits
in the accept queue). Each session keeps its own virtual output + encoder; they share the
host-lifetime input/audio/mic services — i.e. **multiple devices viewing/controlling the same
desktop** on kwin/mutter/wlroots. Validated live on the GNOME box: two clients connected at once
→ **two independent Mutter virtual outputs (1280×720 + 1920×1080) streaming simultaneously**
(39 MB + 48 MB). gamescope's *independent-desktops* (multi-user) isolation — per-session
input/audio — is a follow-up.
- **Apple client latency HUD** — `PunktfunkConnection.clockOffsetNs` (from the C-ABI getter) +
`LatencyMeter` surface a skew-corrected **capture→client-receipt** p50/p95 in the macOS HUD: the
first cross-machine latency the real Apple client reports. (Stage-1 `AVSampleBufferDisplayLayer`
@@ -59,5 +67,7 @@ All three appliances advertise over mDNS (`_punktfunk._udp`) and require PIN pai
See the [Roadmap](/docs/roadmap) for the ordered list. Near-term:
- **True glass-to-glass**: Apple client present-stamp (decode→present) + host render→capture term.
- **Apple stage-2 presenter** (`VTDecompressionSession` → `CAMetalLayer`).
- **Mandatory PIN pairing + delegated pairing approval**; concurrent sessions.
- **Mandatory PIN pairing + delegated pairing approval** (an already-paired device approves a new one).
- **gamescope multi-user isolation** — per-session input/audio so concurrent sessions are independent
desktops (the shared-desktop multi-view case landed).
- **bazzite** kept up to date (currently offline; one rebuild behind).