LayoutTests/fast/events/message-channel-gc-2.html

   1 <body>
   2 <p>Test that MessagePort close event gets delivered (without crashing) even if the channel object is garbage collected.</p>
   3 <pre id=log></pre>
   4 <script>
   5 function gc()
   6 {
   7     if (window.GCController)
   8         return GCController.collect();
   9
  10     for (var i = 0; i < 10000; i++) { // > force garbage collection (FF requires about 9K allocations before a collect)
  11         var s = new String("abc");
  12     }
  13 }
  14
  15 function log(message)
  16 {
  17     document.getElementById("log").innerHTML += message + "<br>";
  18 }
  19
  20 if (window.layoutTestController) {
  21     layoutTestController.dumpAsText();
  22     layoutTestController.waitUntilDone();
  23 }
  24
  25 var channel = new MessageChannel;
  26
  27 channel.port1.onclose = function() { log("onclose"); setTimeout(function() { if (window.layoutTestController) layoutTestController.notifyDone(); gc(); }, 0) }
  28 channel.port1.addEventListener("close", function() { log("close listener"); gc(); }, false);
  29
  30 gc();
  31 channel.port1.start();
  32 channel.port2.postMessage("msg");
  33
  34 gc();
  35 channel.port1.close();
  36 channel.port2.close();
  37 gc();
  38 channel = new MessageChannel;
  39 gc();
  40 </script>
  41 </body>