molluskandClaude Opus 4.8
306bc295b1
Closes the two Windows-only follow-ups Codex deferred in the RT-audit
re-review (review-2026-06-19-cpal-rt-audit.md). Both are cfg(windows),
so they carry zero risk to the shared Linux audio path.
B3 — orphan-thread tombstone on a wedged start. On the FINISH_START_TIMEOUT
path the owner thread is detached (not joined) so start_*/stop can't hang;
previously the slot was left empty, so a retry against a permanently wedged
device spawned ANOTHER orphan worker holding its own COM/device handle, and
so on without bound. The slot is now a SlotState { Idle | Live | Wedged }:
- Each worker carries an `exited: Arc<AtomicBool>` flipped true by an
ExitGuard at the top of the thread body — fires on normal return, panic
unwind, or whenever the wedged driver call finally releases the thread.
- A timed-out start detaches its thread and leaves a `Wedged { exited }`
tombstone instead of an empty slot.
- `ensure_idle` (pure, unit-tested) rejects new starts while the orphan is
still alive, but clears the tombstone once `exited` flips, so the slot
becomes reusable after the device recovers. `stop` restores a still-live
tombstone rather than silently clearing it.
B5 — choose_config picks a bounded supported rate before the device default.
A device whose default rate is outside the drivable 8k–384k window but which
also exposes a usable in-window config was previously rejected by resolve().
New case 3 scans the supported config ranges for one overlapping the window
and drives it at a `bounded_rate` (48 kHz when reachable, else the nearest
in-window bound), preferring the native layout; the device default is now a
last resort. `bounded_rate` is pure and unit-tested.
6 new unit tests (bounded_rate x4, ensure_idle x2) — they're in the
cfg(windows) module, so they compile/run under the windows-gnu target, not
the Linux lib suite.
Verified: Linux cargo test --lib 326/0 + clippy --lib --tests clean (shared
paths untouched); windows-gnu cargo check --release --lib --tests --bins
clean, no warnings.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>