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plan: Design B core — parkable activities as scheduler contexts

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Doc 20: the remaining core of Design B, scoped against what S0-S6 built
and motivated by the doc-19 hang. Core rule: nothing parks in place —
every suspendable activity yields its own context, so a context's state
is authoritative and the guessing layer (quarantine, consume-once,
libcontext refusals, dispatch interlock) gets deleted rather than
tuned. Phases D0-D6 with gates, 6-10 wk; memory/partial-migration/
pthread risks called out; index updated.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TfxKn5utcntBSnxz4ZnYKs
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Gergő Törcsvári 2026-08-05 19:28:19 +02:00
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@ -44,6 +44,8 @@ or **hang** (a swap unwinds but is never rewound).
| [`09-dom-window-lifetime-hypothesis.md`](09-dom-window-lifetime-hypothesis.md) | Concrete failure story and first fix experiment for the DOM-port stale `wxWindow` hypothesis: destructor ordering, DOM event reentry, and validation plan. |
| [`10-resolution-menubar-uaf.md`](10-resolution-menubar-uaf.md) | **RESOLVED:** the regression was a freed `wxMenuBar` left in a live frame's child list by `wxMenuBarBase::Detach()` (DOM-port only — the bar is a real child there). One-line fix in `wxMenuBar::Detach()`; full kicad suite green, zero corruption signatures. |
| [`11-asyncify-nesting-raytracer.md`](11-asyncify-nesting-raytracer.md) | **Finding + decision:** the WASM 3D raytracer is single-core because `emscripten_sleep` can't nest on an already-unwinding Asyncify context — yielding to join worker threads aborts with `invalid state: 1` since the viewer renders inside a suspended wx modal pump. Multi-core pool (~6–7×) built + parked; unpark needs a *nestable* yield (fiber/JSPI). |
| [`19-quasimodal-fiber-strand.md`](19-quasimodal-fiber-strand.md) | **DIAGNOSED 2026-08:** the Symbol Properties dialog hang — a tool fiber parks mid-body, the stale-fiber guard refuses (and drops) its resume, the dispatch interlock is never released, every click is deferred forever. Live-captured frozen state; ranked fixes; regression-vs-pre-existing still open. |
| [`20-design-b-core-plan.md`](20-design-b-core-plan.md) | **PLAN (2026-08):** the remaining Design B core — every parkable activity becomes a scheduler context that yields instead of parking in place, which deletes the guessing layer (quarantine/consume-once/interlock) rather than tuning it. Phases D0–D6, 6–10 wk, with the memory and partial-migration risks called out. |
| [`17-mailbox-scheduler-plan.md`](17-mailbox-scheduler-plan.md) | **PLAN (2026-08):** the mailbox/scheduler implementation plan — Design B's phasing revised with the July–August guard record (dispatch interlock, open-settle gate, v0.1.28 schedule-don't-dispatch). Test inventory with per-test fate (keep / rewrite / retire / new), 7 steps S0–S6 with gates and rollback, ≈5–7 wk. Supersedes 12/13's phasing; overturns 13 §6f's "no scheduler needed". |
## The single decisive next step