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<p>Test that MessagePort close event gets delivered (without crashing) even if the channel object is garbage collected.</p>
<pre id=log></pre>
<script>
function gc()
{
    if (window.GCController)
        return GCController.collect();
    for (var i = 0; i < 10000; i++) { // > force garbage collection (FF requires about 9K allocations before a collect)
        var s = new String("abc");
    }
}

function log(message)
{
    document.getElementById("log").innerHTML += message + "<br>";
}

if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
}

var channel = new MessageChannel;

gc();
channel.port1.start();
channel.port2.postMessage("msg");

gc();
channel.port1.close();
channel.port2.close();
gc();

setTimeout(function() {
    log("DONE");
    gc();
    if (window.testRunner)
        testRunner.notifyDone();
}, 0);
channel = new MessageChannel;
gc();

</script>
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