third_party/WebKit/LayoutTests/fast/workers/worker-messageport-gc.html

   1 <body>
   2 <p>Test that workers stay reachable via message ports.
   3 Should print "DONE" when done.</p>
   4 <div id=result></div>
   5 <script>
   6 function log(message)
   7 {
   8     document.getElementById("result").innerHTML += message + "<br>";
   9 }
  10
  11 if (window.testRunner) {
  12     testRunner.dumpAsText();
  13     testRunner.waitUntilDone();
  14 }
  15
  16 // Test that workers stay alive even though they are only reachable via message ports.
  17 var worker = new Worker("resources/worker-messageport.js");
  18 var channel = new MessageChannel();
  19 worker.postMessage("port", [channel.port1]);
  20 worker = 0;
  21
  22 channel.port2.postMessage("ping");
  23 channel.port2.onmessage = function(evt) {
  24     // Other side is running, now force a GC, wait a bit, and send a new message to make sure it arrives.
  25     gc();
  26     setTimeout(testReachable, 100);
  27 }
  28
  29 function testReachable()
  30 {
  31     channel.port2.onmessage = function(evt) {
  32         log("PASS: Worker is reachable.");
  33         done();
  34     }
  35     channel.port2.postMessage("ping");
  36 }
  37
  38 function gc()
  39 {
  40     if (window.GCController)
  41         return GCController.collectAll();
  42
  43     for (var i = 0; i < 10000; i++) { // force garbage collection (FF requires about 9K allocations before a collect)
  44         var s = new String("abc");
  45     }
  46 }
  47
  48 function done()
  49 {
  50     log("DONE");
  51     if (window.testRunner)
  52         testRunner.notifyDone();
  53 }
  54
  55 </script>
  56 </body>
  57 </html>
  58