shoney.arickathil
7a614420f4
- docs/examples/fibers: part 1 is TIMING-FREE and byte-exact — main sends three messages then burns reductions; each budget expiry hands the Counter actor exactly one delivery (cooperative mechanics, preemptive fairness, BEAM's shape); part 2 parks a Sleeper actor mid-receive on the I/O plane while main keeps ticking — the wake lands between ticks, proving a sleeping fiber blocks nobody - the missing "sleeper: up" on the first run was main-return-reap working as specced (main ended before the deadline); the demo's window widened so the wake is observable - scripts/fibers-accept.sh + `just fibers` (8 checks): build, part-1 exact + part-2 ordering invariants on auto/uring/epoll backends, and an ASan-runtime rebuild+run - README points at the doctrine writeup (exploration/fibers) Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> |
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fibers — the hybrid scheduler, demonstrated
The smallest program that shows all three legs of the concurrency model
(the doctrine-depth writeup lives in
docs/plan/exploration/fibers/00-fibers.md):
- Reduction-budget eviction — part 1's output is byte-exact and timing-free: main sends three messages, then burns reductions; every time its budget expires the counter actor gets a turn and delivers exactly one message. Cooperative mechanics, preemptive fairness.
- Actors as the spawn surface —
spawn Counter { ... }returns anactor Tick;sendmoves the message (using it afterwards is a compile error); delivery is one message at a time per actor. - Parking, not blocking — part 2's sleeper actor calls
time.sleepmid-receive: the fiber parks on the shard's I/O plane (io_uring primary, epoll fallback —WO_IO=uring|epollforces either) and main keeps ticking while it sleeps.
Run: just fibers (the acceptance gate builds it, checks part 1
byte-exact, asserts part 2's ordering invariants, and repeats the run on
both I/O backends plus ASan).