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refactor: retire bespoke Task async; one stack behind context.io (Phase 5)

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Converge the Io unification (PLAN-IO-UNIFY Phase 5). The bespoke fiber-task layer
in sched.sx — Task / TaskState / TaskErr / go / wait / cancel(Task), plus
Scheduler.task_allocs and its deinit bookkeeping (~130 lines) — is removed. There
is now ONE async stack: context.io.async / await / cancel / race / sleep over the
Io protocol, with the Scheduler as the fiber Io's engine + driver (spawn /
yield_now / suspend_self / wake / run / block_on_fd remain as the raw primitives;
race stays in sched.sx because it needs meta.sx's make_enum/make_variant).

Migrated the four go/wait users to context.io:
- 1813 — interleave + cancel (sequence 1 2 3 42 100 -99)
- 1817 — m1 end-to-end (completion in deadline order, sum 123)
- 1819 — double-AWAIT loud-abort via the Future one-awaiter guard
- 1820 — deinit: dropped the go/task_allocs tasks; now exercises timers/io_waiters/
  kq cleanup (freed=2, live=3 = the documented per-spawn closure-env residual)

Updated readme.md (the user-facing async section documents context.io.async /
await / race / sleep) and the stale sched.go/sched.Task comments in io.sx.

Suite 854/0; no .ir churn (Task removal touched no snapshotted IR); migrated
examples byte-identical on aarch64-macOS + aarch64-linux. PLAN-IO-UNIFY Phases 0-5
all complete — the two parallel async stacks are now one, behind context.io.
This commit is contained in:
agra
2026-06-28 10:14:17 +03:00
parent 97b0abef66
commit aae7d72a66
11 changed files with 174 additions and 287 deletions
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@@ -36,6 +36,23 @@ installed via `push Context { io = xx scheduler } { … s.run(); }` — exactly
just with the scheduler now reachable as `context.io`.
## Status (2026-06-28)
- **Phase 5 — CONVERGE: retire the bespoke fiber async API. DONE. Io unification
COMPLETE.** The bespoke `Task` layer (`Task`/`TaskState`/`TaskErr`/`go`/`wait`/
`cancel(Task)` + `Scheduler.task_allocs` and its deinit handling, ~130 lines)
is removed from sched.sx. There is now ONE async stack: `context.io.async`/
`await`/`cancel`/`race`/`sleep` over the `Io` protocol, with the `Scheduler` as
the fiber Io's engine + driver (`spawn`/`yield_now`/`suspend_self`/`wake`/`run`/
`block_on_fd` stay as the raw primitives). Migrated the four `go`/`wait` users to
`context.io`: 1813 (interleave + cancel), 1817 (m1 end-to-end sum=123), 1819
(double-AWAIT loud-abort via the Future one-awaiter guard), 1820 (deinit — the
`go`/`task_allocs` tasks dropped; it now exercises timers/io_waiters/kq cleanup,
`freed=2`/`live=3`). `race` stays in sched.sx (needs meta.sx). Updated readme.md
(the user-facing async section now documents `context.io.async`/`await`/`race`/
`sleep`) and the stale `sched.go`/`sched.Task` comments in io.sx. Suite 854/0; no
`.ir` churn (the Task removal touched no snapshotted IR); migrated examples
byte-identical on aarch64-macOS + aarch64-linux. **PLAN-IO-UNIFY Phases 0–5 all
complete — the two parallel async stacks are now one, behind `context.io`.**
- **Phase 4 — `race` over Futures via `context.io.race`. DONE.** Re-homed the
proven first-wins race from `sched.race(*Task)` onto `*Future` handles + the
`Io` protocol; the old Task-based `race` is REPLACED (ufcs overload-by-receiver