The Tor Browser: content/media/webspeech/recognition/test/test_nested

     1 <!DOCTYPE HTML>

     2 <html>

     3 <!--

     4 https://bugzilla.mozilla.org/show_bug.cgi?id=650295

     5 -->

     6 <head>

     7   <meta charset="utf-8">

     8   <title>Test for Bug 650295 -- Spin the event loop from inside a callback</title>

     9   <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>

    10   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

    11   <script type="application/javascript" src="head.js"></script>

    12 </head>

    13 <body>

    14 <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=650295">Mozilla Bug 650295</a>

    15 <p id="display"></p>

    16 <div id="content" style="display: none">

    18 </div>

    19 <pre id="test">

    20 <script type="text/javascript">

    21   SimpleTest.waitForExplicitFinish();

    23   /*

    24    * window.showModalDialog() can be used to spin the event loop, causing

    25    * queued SpeechEvents (such as those created by calls to start(), stop()

    26    * or abort()) to be processed immediately.

    27    * When this is done from inside DOM event handlers, it is possible to

    28    * cause reentrancy in our C++ code, which we should be able to withstand.

    29    */

    31   function abortAndSpinEventLoop(evt, sr) {

    32     sr.abort();

    33     window.showModalDialog("javascript:window.close()");

    34   }

    36   function doneFunc() {

    37     // Trigger gc now and wait some time to make sure this test gets the blame

    38     // for any assertions caused by showModalDialog

    39     //

    40     // NB - The assertions should be gone, but this looks too scary to touch

    41     // during batch cleanup.

    42     var count = 0, GC_COUNT = 4;

    44     function triggerGCOrFinish() {

    45       SpecialPowers.gc();

    46       count++;

    48       if (count == GC_COUNT) {

    49         SimpleTest.finish();

    50       }

    51     }

    53     for (var i = 0; i < GC_COUNT; i++) {

    54       setTimeout(triggerGCOrFinish, 0);

    55     }

    56   }

    58   /*

    59    * We start by performing a normal start, then abort from the audiostart

    60    * callback and force the EVENT_ABORT to be processed while still inside

    61    * the event handler. This causes the recording to stop, which raises

    62    * the audioend and (later on) end events.

    63    * Then, we abort (once again spinning the event loop) from the audioend

    64    * handler, attempting to cause a re-entry into the abort code. This second

    65    * call should be ignored, and we get the end callback and finish.

    66    */

    68   performTest({

    69     eventsToRequest: [

    70       "EVENT_START",

    71       "EVENT_AUDIO_DATA",

    72     ],

    73     expectedEvents: {

    74       "audiostart": abortAndSpinEventLoop,

    75       "audioend": abortAndSpinEventLoop,

    76       "end": null

    77     },

    78     doneFunc: doneFunc,

    79     prefs: [["media.webspeech.test.fake_fsm_events", true],

    80             ["media.webspeech.test.fake_recognition_service", true]]

    81   });

    83 </script>

    84 </pre>

    85 </body>

    86 </html>

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