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test/parallel/test-worker-unref-from-message-during-exit.js

@@ -0,0 +1,16 @@
+'use strict';
+const common = require('../common');
+const { Worker } = require('worker_threads');
+
+// This used to crash because the `.unref()` was unexpected while the Worker
+// was exiting.
+
+const w = new Worker(`
+require('worker_threads').parentPort.postMessage({});
+`, { eval: true });
+w.on('message', common.mustCall(() => {
+  w.unref();
+}));
+
+// Wait a bit so that the 'message' event is emitted while the Worker exits.
+Atomics.wait(new Int32Array(new SharedArrayBuffer(4)), 0, 0, 100);