Elamur Groupantsmova-hard-cases-control
The groupant beside tools/hard-cases/src/control.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.
Facts
Implementation material. A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.
Components
| component | label | where |
|---|---|---|
| approximant | partial | Forward approximant |
| ast | partial | syntax.json |
| composition | partial | Composition |
| cost | partial | Cost |
| descriptant | present | Descriptant |
| invariant | partial | Invariant |
| tests | finite evidence | Tests |
Obernants
The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.
| id | type | label | where |
|---|---|---|---|
behavior_complement | behavior_complement | partial source derived model | behavior_complement |
reverse_reconstruction | reverse_reconstruction | partial source derived model | reverse_reconstruction |
Model text
Descriptant
The lane's priority and limit share: owned PAUSE on yield_roots while a lane pager works (fresh heartbeat, non-terminal state), removed only as exact owned bytes; an uncertain lane pager stops lane and stop_roots; a generic limit-guard STOP stops the lane. Source: tools/hard-cases/src/control.rs.
Forward approximant
step(now): working = #lane pagers with state not in {plan_exhausted, stopped, deadline_reached, uncertain}, heartbeat within fresh_seconds and no STOP; any lane uncertain -> STOP(lane + stop_roots), exit; stop_root STOP starting 'limit-guard' -> STOP(lane); working>0 and no PAUSE -> write marker; working=0 and PAUSE == marker -> remove.
Invariant
A foreign PAUSE or STOP is never removed or rewritten; STOP files are only created; the guard exits after stopping on uncertainty.
Cost
O(lane pagers + roots) file reads per poll (20 s).
Composition
Cooperates with fish-pages PAUSE/STOP semantics and the generic pool's limit guard. Parent hard-cases.
behavior_complement
Does not preempt an accepted attempt, prove liveness from a snapshot, resume a stopped pager or retry. Evidence status: source-derived model with finite checks, not a proof.
reverse_reconstruction
Events are logged; the PAUSE marker names the lane root, so its owner is recoverable from the file.
Tests
control::tests (2026-11-04): lane work pauses t06 but not the operator-paused t07; stale heartbeat and plan_exhausted remove only the owned pause; red: uncertain lane pager stops lane, generic pagers and producer; a generic limit-guard stop reaches the lane. Finite fixtures and live samples; not a proof.
This page in Markdown â https://md.groupants.elamur.ai/free/en/mova/tools/hard-cases/src/control.rs.groupant/