test_shutdownCheck.xhtml

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<?xml version="1.0"?>

<?xml-stylesheet type="text/css" href="chrome://global/skin"?>

<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>

<window title="Worker shutdown check"

        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>

  <!-- test results are displayed in the html:body -->

  <body xmlns="http://www.w3.org/1999/xhtml">

  </body>

  <!-- test code goes here -->

  <script type="application/javascript">

  <![CDATA[

SimpleTest.waitForExplicitFinish()

const URL = "worker_shutdownCheck.js";

function checkWorker() {

  const wdm = Cc["@mozilla.org/dom/workers/workerdebuggermanager;1"].

              getService(Ci.nsIWorkerDebuggerManager);

  let e = wdm.getWorkerDebuggerEnumerator();

  while (e.hasMoreElements()) {

    let dbg = e.getNext().QueryInterface(Ci.nsIWorkerDebugger);

    if (dbg.url == URL) {

      return true;

  return false;

new Promise(resolve => {

  var w = new Worker(URL);

  ok(checkWorker(), "We have the worker");

  w.onmessage = () => { resolve(); }

}).then(() => {

  info("Waiting...");

  // We don't know if the worker thread is able to shutdown when calling

  // CC/GC. Better to check again in case.

  function checkGC() {

    Cu.forceCC();

    Cu.forceGC();

    if (!checkWorker()) {

      ok(true, "We don't have the worker");

      SimpleTest.finish();

      return;

    setTimeout(checkGC, 200);

  checkGC();

});

]]>

  </script>

</window>