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Connect FLTK shell to JACK engine controls and status

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Johannes Findeisen 2026-10-26 23:40:28 +01:00
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docs/ARCHITECTURE.md
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@ -43,3 +43,12 @@ the optional JACK implementation drives that same realtime engine.
Only acknowledged retired plans are reclaimed during processing. Backend close
synchronizes callbacks before reclaiming remaining plans. See decision 0004
for the release/acquire protocol, bounded resource retention and recovery.
## GUI backend ownership
The Phase 3 window owns one C backend handle and serializes all control calls
on the GUI thread. A GUI timer reads snapshots and collects retired resources;
no audio callback calls FLTK. Successful window close first closes the JACK
client (synchronizing callbacks), then removes the GUI timer and hides the
window. Failed close leaves both handle and window available for retry. View
switching is GUI state only; editors have no domain mutations yet. See GUI.md.