LayoutTests/fast/events/message-channel-gc-4.html

   1 <body>
   2 <p>Test that MessagePort messages are delivered even if both ports are in transit (cloned).</p>
   3 <p>Should say PASS twice.</p>
   4 <pre id=log></pre>
   5 <script>
   6 function gc()
   7 {
   8     if (window.GCController)
   9         return GCController.collect();
  10
  11     for (var i = 0; i < 10000; i++) { // force garbage collection (FF requires about 9K allocations before a collect)
  12         var s = new String("abc");
  13     }
  14 }
  15
  16 function log(message)
  17 {
  18     document.getElementById("log").innerHTML += message + "<br>";
  19 }
  20
  21 if (window.layoutTestController) {
  22     layoutTestController.dumpAsText();
  23     layoutTestController.waitUntilDone();
  24 }
  25
  26 function test1()
  27 {
  28     var channel = new MessageChannel;
  29     var channel2 = new MessageChannel;
  30     channel.port1.postMessage("msg1");
  31     channel2.port1.postMessage("", [channel.port1]);
  32     channel2.port2.postMessage("", [channel.port2]);
  33     channel2.port2.onmessage = channel2.port1.onmessage = function(evt) {
  34         evt.ports[0].onmessage = function(event) {
  35             if (event.data == "msg1") {
  36                 log("PASS: Received message to cloned port.");
  37                 this.postMessage("msg2");
  38                 gc();
  39             } else if (event.data == "msg2") {
  40                 log("PASS: Received message from cloned port.");
  41                 gc();
  42                 if (window.layoutTestController)
  43                     layoutTestController.notifyDone();
  44             } else {
  45                 log("FAIL: Received unknown message: " + event.data);
  46             }
  47         }
  48         evt.ports[0] = 0;
  49     }
  50     channel = 0;
  51     channel2 = 0;
  52     gc();
  53 }
  54
  55 test1();
  56
  57 </script>
  58 </body>