2e86169246
Problem: The Worker-echo.html test flakes under load in CI on the Sanitizer runners, printing its messages out of order. Cause: The test asserts a fixed order for messages arriving over two separate ports: “loaded” over the Worker’s own port, and the channel messages over the transferred MessagePort. Those two race, with no cross-port ordering guarantee. So the printed order is nondeterministic. Fix: Sequence each message explicitly with an awaited helper — the same approach used for SharedWorker-reuse in #9669 — so the printed order is deterministic. port2 is left unstarted until after “loaded”.
30 lines
1 KiB
HTML
30 lines
1 KiB
HTML
<!DOCTYPE html>
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<script src="../include.js"></script>
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<script>
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asyncTest(async (done) => {
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const work = new Worker("worker.js");
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const channel = new MessageChannel();
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function nextMessage(target, label) {
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return new Promise((resolve) => {
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target.addEventListener("message", function handler(event) {
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target.removeEventListener("message", handler);
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println(label + ": " + JSON.stringify(event.data));
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resolve(event.data);
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});
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});
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}
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work.postMessage({ port: channel.port1 }, { transfer: [channel.port1] });
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await nextMessage(work, "Got message from worker");
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channel.port2.start();
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await nextMessage(channel.port2, "Got message from port");
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channel.port2.postMessage("Hello from port2");
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await nextMessage(channel.port2, "Got message from port");
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println("DONE");
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work.terminate();
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done();
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});
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</script>
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