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https://bugzilla.mozilla.org/show_bug.cgi?id=650295
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<title>Test for Bug 650295 -- Spin the event loop from inside a callback</title>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=650295">Mozilla Bug 650295</a>
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<pre id="test">
<script type="text/javascript">
SimpleTest.waitForExplicitFinish();
/*
* SpecialPowers.spinEventLoop can be used to spin the event loop, causing
* queued SpeechEvents (such as those created by calls to start(), stop()
* or abort()) to be processed immediately.
* When this is done from inside DOM event handlers, it is possible to
* cause reentrancy in our C++ code, which we should be able to withstand.
*/
function abortAndSpinEventLoop(evt, sr) {
sr.abort();
SpecialPowers.spinEventLoop(window);
}
function doneFunc() {
// Trigger gc now and wait some time to make sure this test gets the blame
// for any assertions caused by spinning the event loop.
//
// NB - The assertions should be gone, but this looks too scary to touch
// during batch cleanup.
var count = 0, GC_COUNT = 4;
function triggerGCOrFinish() {
SpecialPowers.gc();
count++;
if (count == GC_COUNT) {
SimpleTest.finish();
}
}
for (var i = 0; i < GC_COUNT; i++) {
setTimeout(triggerGCOrFinish, 0);
}
}
/*
* We start by performing a normal start, then abort from the audiostart
* callback and force the EVENT_ABORT to be processed while still inside
* the event handler. This causes the recording to stop, which raises
* the audioend and (later on) end events.
* Then, we abort (once again spinning the event loop) from the audioend
* handler, attempting to cause a re-entry into the abort code. This second
* call should be ignored, and we get the end callback and finish.
*/
performTest({
eventsToRequest: [],
expectedEvents: {
"audiostart": abortAndSpinEventLoop,
"audioend": abortAndSpinEventLoop,
"end": null
},
doneFunc: doneFunc,
prefs: [["media.webspeech.test.fake_fsm_events", true],
["media.webspeech.test.fake_recognition_service", true]]
});
</script>
</pre>
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