Hub WaitReceive uses round-robin fairness
Platform spec ADR
Hub WaitReceive uses round-robin fairness
Spec standingStandard
- Concurrency package - Contracts and edge cases Send, Receive, Join, Cancel, and Hub normative contracts.
- Concurrency package - Decisions record (legacy index) Migration index pointing to per-decision ADR files under adr/—normative text lives in ADRs, not this page.
- Concurrency package - Design model Package layout, module map, and thin-wrapper rule for Fiber and Channel structs.
- Concurrency package - Examples Illustrative spawn, Channel, and Hub usage (informative).
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| Section id | Required | Found |
|---|---|---|
what-this-feature-specifies | yes | yes |
implementation-anchors | yes | yes |
Full tree: run pnpm verify:platform-spec-layout (writes src/generated/platform-spec-layout-report.json).
Context
Section titled “Context”FIFO registration order starves late channels when an early channel is always ready.
Decision
Section titled “Decision”| Rule | Detail |
|---|---|
| Algorithm | Round-robin among channels with a ready Receive |
| Cursor | Per-Hub index advanced after each successful WaitReceive |
| v1 scope | WaitReceive only — no WaitSend |
Consequences
Section titled “Consequences”Console hubs should keep registration count small (under 16 typical).
Verification anchors
Section titled “Verification anchors”Hub integration tests in runtime and corelib suites.