smarm
7746dca69b
While running benchmarks, a hang surfaced in timer-only workloads — actors sleeping with no IO in flight. Tracing it down, the race lives in sleep(): between the call to `timers.insert_sleep` and the subsequent `park_current` yield, the actor is still in State::Runnable. If the timer fires in that window, the old code's `if matches!(slot.state, State::Parked)` guard silently drops the wakeup. The actor then parks normally and never gets re-queued — it sleeps forever. The fix mirrors what scheduler::unpark() and the IO FdReady path already do: when the timer fires and the slot is still Runnable, set `pending_unpark` instead of re-queuing immediately. The upcoming Park yield sees the flag and re-queues the actor rather than suspending it, closing the race without any new synchronisation. Adds a regression test: 100 actors doing pure timer sleeps across ≥2 scheduler threads. The test asserts both correctness (all actors complete) and timeliness (wall time < 2×sleep duration), which is enough signal to catch a stuck actor even on a single-core CI runner.
314 lines
5.8 KiB
JSON
314 lines
5.8 KiB
JSON
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