test_nested_native_loop_wakeup_mac.html

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<html>

<head>

  <title>Nested event loop started from a native event does not lose the outer loop's wake-up</title>

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

  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css" />

</head>

<body>

<script>

"use strict";

const TOPIC = "appshell-native-test-event";

add_task(async function test_nested_native_loop_wakeup() {

  const appShell = Cc["@mozilla.org/widget/appshell/mac;1"].getService(

    Ci.nsICocoaAppShellTestUtils

);

  let innerDone = false;

  let outerDone = false;

  let ranNested = false;

  let innerReturnedAt = 0;

  const observer = () => {

    Services.obs.removeObserver(observer, TOPIC);

    ranNested = true;

    // A timer makes sure the wake-up arrives while the nested loop is

    // blocked in the native wait, not before it starts waiting.

    const timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);

    timer.initWithCallback(

      () => {

        innerDone = true;

        outerDone = true;

},

50,

      Ci.nsITimer.TYPE_ONE_SHOT

);

    Services.tm.spinEventLoopUntil("test inner loop", () => innerDone);

    innerReturnedAt = ChromeUtils.now();

};

  Services.obs.addObserver(observer, TOPIC);

  const rescue = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);

  rescue.initWithCallback(() => {}, 5000, Ci.nsITimer.TYPE_ONE_SHOT);

  const lostBefore = appShell.lostNativeWakeups;

  appShell.postNativeTestEvent();

  Services.tm.spinEventLoopUntil("test outer loop", () => outerDone);

  const stall = ChromeUtils.now() - innerReturnedAt;

  rescue.cancel();

  ok(ranNested, "The nested loop ran from within the native event dispatch");

  info(`Outer loop returned ${stall.toFixed(1)} ms after the nested loop`);

is(

    appShell.lostNativeWakeups - lostBefore,

0,

    "The outer native loop did not go back to waiting after a nested loop consumed its wake-up"

);

});

</script>

</body>

</html>