LayoutTests/fast/events/message-channel-gc-3.html - WebKit - Git at Google

 <body>
 <p>Test that MessagePort messages are delivered even if both ports are inaccessible from JS any more.</p>
 <p>Should say PASS twice.</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();
 }

 function test1()
 {
     var channel = new MessageChannel;

     channel.port1.onmessage = function(evt) { log("PASS: message delivered. Port: " + evt.target); test2(); }
     channel.port2.postMessage("msg");

     channel = 0;
     gc();
 }

 function test2()
 {
     var channel = new MessageChannel;

     channel.port2.close();

     channel = 0;
     gc();
     log("PASS: port closed.");
     if (window.testRunner)
         testRunner.notifyDone();
 }

 test1();

 </script>
 </body>
	<body>
	<p>Test that MessagePort messages are delivered even if both ports are inaccessible from JS any more.</p>
	<p>Should say PASS twice.</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();
	}

	function test1()
	{
	var channel = new MessageChannel;

	channel.port1.onmessage = function(evt) { log("PASS: message delivered. Port: " + evt.target); test2(); }
	channel.port2.postMessage("msg");

	channel = 0;
	gc();
	}

	function test2()
	{
	var channel = new MessageChannel;

	channel.port2.close();

	channel = 0;
	gc();
	log("PASS: port closed.");
	if (window.testRunner)
	testRunner.notifyDone();
	}

	test1();

	</script>
	</body>