967aed67d4
`context.io.async(worker)` / `await` now run over the `Io` PROTOCOL, so the
same code interleaves under the fiber scheduler or runs inline under the
blocking `CBlockingIo` — one async stack, reached purely through `context.io`.
- Protocol: `suspend_raw(park: *ParkToken)` (was by-value). A suspending impl
records the parked execution context into `park.handle` before parking, so a
cross-context `ready(park)` knows whom to resume; `Scheduler.suspend_raw`
writes `self.current`, `CBlockingIo` ignores it.
- io.sx async layer rewritten colorblind: `async` submits the worker through
`io.spawn_raw` (inline under blocking, a fiber under the scheduler) and returns
a HEAP `*Future($R)` the worker fills later; `await` suspends via `suspend_raw`
until ready, then returns/raises. The generic worker is bridged to spawn_raw's
raw `(*void)->void` entry via a monomorphic `ThunkBox` (a heap-boxed nullary
completion closure) — all genericity lives in the closure env. Workers are
nullary (inputs captured at the call site) because a variadic pack can't cross
the fiber boundary. `CBlockingIo.spawn_raw` now runs the worker inline.
- Migrated 1805/1806 to the nullary `*Future` form; retrofit 1822/1823 to the
`push .{ … }` partial-context literal (inherits allocator/data).
- The async machinery adds a few prelude types, shifting the type-name table —
40 `.ir` snapshots regenerated (no behavior change; only `.exit`/`.stdout`/
`.stderr` would signal that, and none changed).
Locked by examples/concurrency/1824 — two async tasks under the fiber Io, the
completion log proving deferral (1 2 then 10 20 then 123). Suite 829/0,
byte-identical aarch64-macOS host + aarch64-linux container.
18 lines
693 B
Plaintext
18 lines
693 B
Plaintext
// B1.2 — cancellation rides the `!` error channel (model (a)). `f.cancel()`
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// sets the per-future cancel flag + marks `state = .canceled`, so a
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// subsequent `f.await()` raises `error.Canceled` out of its value-failable
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// `($R, !IoErr)` — caught here with `or`. A future that is NOT canceled
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// awaits its value normally.
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#import "modules/std.sx";
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main :: () {
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// Not canceled → await yields the value.
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ok := context.io.async(() -> i64 => 7);
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print("ok: {}\n", ok.await() or { -1 });
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// Canceled → await raises .Canceled → the `or` default is taken.
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c := context.io.async(() -> i64 => 7);
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c.cancel();
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print("canceled: {}\n", c.await() or { -99 });
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}
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