fix(capture/vdisplay): descriptor-following defers while a topology reassert is in flight

The exclusive-topology reassert's forced re-commit transiently bounces the virtual display's mode; the descriptor poller can sample that EVICTION state and recreate the ring at a mode the recovery chain is about to undo (field log 2026-07-27 10:30:44Z: hdr=true → false → recreate → recovery restores true → second recreate). New pf-win-display::topology_churn latch (deadline semantics — self-expiring, so a lost release can never wedge descriptor- following off): the watchdog holds it for interval+3s each fighting round and releases on "stable again"; poll_display_hdr consumes samples but acts on nothing while held — which also keeps the negotiated-depth pin-back from issuing a CCD write mid-eviction, where it would fight the reassert itself. The deliberate recreate_ring_in_place recovery path is unaffected. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-27 15:37:05 +02:00
parent 9e1a686795
commit 1945052e66
4 changed files with 99 additions and 0 deletions
@@ -16,6 +16,9 @@ pub mod display_events;
 mod input_desktop;
 #[cfg(target_os = "windows")]
 pub mod monitor_devnode;
+/// Cross-crate "topology churn in flight" latch (pure std — no Windows surface, so unconditionally
+/// compiled and unit-tested on every platform).
+pub mod topology_churn;
 #[cfg(target_os = "windows")]
 pub mod win_display;