feat(core): timers — send_after / send_every (delayed + periodic messages) - #8
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…ages) Fills the one clear common-pattern gap: scheduling. Any ActorRef can schedule messages to itself or others. - send_after(delay, msg): one-shot. send_every(interval, make): periodic, returns a TimerHandle with cancel(). Delivery is non-blocking try_send (best-effort, like pubsub). - Implementation: one lazily-started process-global timer thread with a deadline min-heap; never touches the core hot loop or shutdown. A periodic timer self-terminates when the target actor is gone (try_send Closed), so a dropped handle never leaks a forever-firing thread. Drop does NOT cancel — cancel() is explicit — so fire-and-forget just works. - Example core/examples/timers.rs (heartbeat); guide (EN+JA) §4.6 + README tables (EN+JA). Verified: build (default+net), tests (incl. 3 new timer tests), doctests, Loom, clippy — all green. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Fills the one clear common-pattern gap: scheduling. Any
ActorRefcan schedule messages.API
send_after(delay, msg)— one-shot.send_every(interval, make)— periodic; returns aTimerHandlewithcancel().try_send(best-effort, like pub/sub).Design (non-invasive)
shutdown.try_send→Closed), so a dropped handle never leaks a forever-firing thread.cancel()is explicit.Docs & example
core/examples/timers.rs(heartbeat), guide §4.6 (EN + JA), README example tables (EN + JA).Verified: build (default + net), tests (incl. 3 new timer tests: fires-after-delay, ticks+cancel, self-terminates-when-gone), doctests, Loom, clippy — all green.
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