Claude
3c7e26bc98
- next_monitor_id -> AtomicU64 on RuntimeInner - timers -> own Mutex<Timers>; io -> own Mutex<Option<IoThread>> (lock order: io-before-shared) - pending_closures Vec folded into Slot::pending_closure - termination check reads io liveness before shared; ordering argument documented - poison fix: check_cancelled() no longer fires while preemption is disabled, so a cancellation unwind can never poison a runtime/channel mutex - regression test: tests/poison_stop.rs - ROADMAP_v0.5.md added
43 lines
1.6 KiB
Rust
43 lines
1.6 KiB
Rust
//! Regression: request_stop racing an alloc-under-lock must not poison any
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//! runtime mutex. Before the fix, check_cancelled() fired regardless of
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//! PREEMPTION_ENABLED, so a sentinel unwind could trigger inside with_shared
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//! (which allocates: run_queue.push_back, waiters.push, etc), poisoning the
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//! shared mutex and cascading lock().unwrap() panics.
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use smarm::runtime::{init, Config};
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use std::sync::atomic::{AtomicUsize, Ordering};
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use std::sync::Arc;
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#[test]
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fn stop_storm_does_not_poison_runtime() {
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let rt = init(Config::exact(4));
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let completed = Arc::new(AtomicUsize::new(0));
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let c = completed.clone();
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rt.run(move || {
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// Spawn many short actors that allocate + yield heavily (hammering
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// with_shared), and request_stop each one mid-flight from siblings.
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let mut handles = Vec::new();
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for _ in 0..200 {
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let h = smarm::spawn(|| {
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for _ in 0..50 {
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let _v: Vec<u8> = Vec::with_capacity(64); // alloc → maybe_preempt
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smarm::yield_now();
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}
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});
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handles.push(h);
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}
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// Cancel half of them; the others run to completion. If any lock got
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// poisoned the runtime would panic on a subsequent lock().unwrap().
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for (i, h) in handles.iter().enumerate() {
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if i % 2 == 0 {
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smarm::request_stop(h.pid());
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}
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}
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for h in handles {
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let _ = h.join();
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}
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c.fetch_add(1, Ordering::SeqCst);
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});
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assert_eq!(completed.load(Ordering::SeqCst), 1, "root completed cleanly");
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}
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