Worker-postMessage-happens-in-parallel.https.html

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This WPT test may be referenced by the following Test IDs:
- /workers/Worker-postMessage-happens-in-parallel.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Test that calling "worker.postMessage()" will occur truly in parallel to the main JS thread performing other computation.</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script>

promise_test(t => {

  return new Promise(resolve => {

    let worker = new Worker("support/Worker-postMessage-happens-in-parallel.js");

    worker.postMessage('init');

    worker.onmessage = () => {

      let sab = new Uint8Array(new SharedArrayBuffer(16));

      worker.postMessage(sab);

      let end = performance.now() + 30*1000;

      while(sab[0] != 1 && performance.now() < end) /*wait to join with the result*/;

      assert_true(sab[0] == 1);

      resolve();

};

});

}, 'Tests that calling "worker.postMessage()" will occur truly in parallel to the main JS thread');

</script>