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fix(worker): terminate() reaches a worker still inside its entry script - #493
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The worker's isolate was published to its wrapper only after the startup function returned, i.e. after the entry script had finished evaluating, so Terminate() found nothing to interrupt for a worker still in its entry: a synchronous loop there ran forever, and a parked top-level await ended only when the loader's settle deadline expired. Node and the web both interrupt the running entry. The isolate is now published right after the worker runtime is initialized, before the entry runs, and the startup function honors a terminate() that landed earlier by checking the flag before any app code. A termination that lands inside the entry unwinds RunModule, which no longer rethrows or reports on a terminating isolate, and the thread goes straight to its existing teardown path. The module runner and the exception constructor name a caught termination for what it is instead of formatting the TryCatch, and the settle pump checks for one after its loop too, so a termination is never reported as a timeout or as an entry rejection. Also documents the real resourceLimits and ios.priority Worker options in docs/worker-threads.md, whose node:worker_threads table claimed the runtime imposed no limits. Suite 1735/0, also under AddressSanitizer. Fixes #445
…s way out A termination that interrupts a CommonJS entry unwinds through the native require callback, whose catch re-threw the message-only failure onto the isolate as an ordinary Error: V8 then reported an exception rather than a termination to RunModule's TryCatch, which built a full error report before the worker boundary dropped it. ReThrowToV8 now leaves a terminating isolate alone, since the pending termination is the failure, and RunModule consults the same three termination signals as the settle pump. The pumped graph walk ahead of an entry's compile bails on termination but reports nothing, so LoadESModule went on to the synchronous HTTP loader, which can block on the network. Both walks are now followed by a termination check. Also refreshes the drain comment that described the pre-publication isolate window, widens the startup-sweep spec's spread so its rounds reach the settle pump, and corrects the resourceLimits RangeError wording.
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📝 WalkthroughWalkthroughWorker startup now publishes its isolate before entry-script execution. Termination checks and interruption handling cover worker startup, module loading, and evaluation. New tests exercise termination at several startup and entry-script states. Worker-thread documentation describes termination and option behavior. ChangesWorker termination lifecycle
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Caller
participant WorkerWrapper
participant WorkerIsolate
participant ModuleInternal
participant WorkerTask
Caller->>WorkerWrapper: request worker termination
WorkerWrapper->>WorkerIsolate: request execution termination
ModuleInternal->>WorkerIsolate: evaluate worker entry script
WorkerIsolate-->>ModuleInternal: report terminated execution
ModuleInternal-->>WorkerTask: throw interruption error
WorkerTask-->>Caller: worker ends
Suggested reviewers: Merge Risk: 🔵 Low · up to A narrow termination race can produce misleading module-error handling. The change is mergeable with owner awareness, though both failure branches should recognize pending termination. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Out of Scope Changes checkExplanation The termination documentation is within issue Full details: Docstring CoverageExplanation Docstring coverage is 40.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 5 files. (5 skipped: 5 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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edusperoni
added this pull request to stack #495
October 7, 2026 20:04
edusperoni
marked this pull request as ready for review
October 7, 2026 20:05
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Review comments at @NativeScript/runtime/ModuleInternal.mm:
- Line 1298: Update the termination checks at
NativeScript/runtime/ModuleInternal.mm lines 897–897 and 1298–1298 to also
recognize a pending runtime termination: retrieve the Runtime for the isolate
and check IsTerminationRequested(), guarding against a null runtime. At the
first site, retain the existing termination exception behavior; at the second,
retain the terminated-phase logging and exception behavior.
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NativeScript/runtime/DataWrapper.hNativeScript/runtime/ModuleInternal.mmNativeScript/runtime/NativeScriptException.mmNativeScript/runtime/Worker.mmNativeScript/runtime/WorkerWrapper.mmTestRunner/app/tests/WorkerTerminateTests.jsTestRunner/app/tests/index.jsTestRunner/app/tests/workerTerminate/busyEntryWorker.jsTestRunner/app/tests/workerTerminate/parkedEntryWorker.mjsdocs/worker-threads.md
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…ailure sites The CommonJS module-function call and the ES module Evaluate failure only recognized a termination V8 had already materialized. A request that landed during the call, before any JS ran to materialize it, let an ordinary failure be formatted as an error on a terminating isolate. Both sites now read the same three signals as the settle pump and the require path.
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Fixes #445.
The defect
worker.terminate()was a no-op while a worker was still evaluating its entry script. The isolate was published to the wrapper only after the startup function returned, soTerminate()found nothing to interrupt: an entry spinning in a synchronous loop ran forever, and an entry parked in a top-levelawaitended only when the loader's settle deadline expired. Node publishes its environment beforeLoadEnvironmentand callsTerminateExecutionon it; the HTML "terminate a worker" steps abort the running script unconditionally. Both interrupt the entry.The fix
WorkerWrapper::PublishIsolateruns right after the worker runtime is initialized and before the entry runs. Aterminate()that landed earlier is honored by a flag check before any app code; one that lands later interrupts the entry throughTerminateExecutionplus the termination-requested flag the settle pump polls.ReThrowToV8, the message-queue enable and the error report once terminating, and the thread goes straight to the existing teardown.ReThrowToV8itself leaves a terminating isolate alone, so a native frame between the interrupted JS and the worker boundary cannot replace the termination with an ordinary Error.NativeScriptExceptionTryCatch constructor returns early on a terminated TryCatch, and twoToCheckedproperty probes in the reporters becameFromMaybe.CallOnErrorHandlersand the TryCatch reporter return early when terminating or when the TryCatch holds a termination; the string reporter stays open for the paths that report and then terminate themselves (missing entry, heap cap).Against the six rules in #445: 1 (flag-driven pump exit), 2 (termination checked before the timeout branch, explicit
HasTerminatedbranches), 3 (no reports), 4 (nothing after the bail runs JS), 5 (formatter audit) and 6 (parked.mjsentry terminated mid-pump, repeated rounds) are covered.Docs
docs/worker-threads.mdclaimed the runtime imposes no per-worker limits. TheresourceLimitsconstructor option has been real since #471, so thenode:worker_threadsrow now says only the export is a{}shim, and a new "Worker options" section documentsios.priorityandresourceLimits(keys, validation, heap-cap behaviour). A "terminate() reaches the entry script" subsection records the new semantics.Tests
TestRunner/app/tests/WorkerTerminateTests.js:for (;;) {}ends within milliseconds ofterminate();awaitends while still in the settle pump;nsworkerendedand no error event;node:worker_threadsterminate()resolves with 0 and emitsexitfor a worker stuck in its entry.Suite: 1735/0, also under AddressSanitizer. An independent review of the diff found no blockers; its should-fix items (the
ReThrowToV8gate, the post-walk termination check, comment and docs wording) are in the second commit.Follow-up
The Android runtime already has these semantics (android#2021). A stacked PR adds an
ns:worker_threadsbuiltin with type declarations for the iOS constructor options.Summary by CodeRabbit
Bug Fixes
await, and startup. Terminating workers exit without dispatching termination-related errors.Documentation
terminate()interrupts execution, whileclose()allows the calling script to finish.resourceLimitsexport is always{}, though the constructor option remains supported.