third_party/WebKit/LayoutTests/fast/workers/wrapper-map-gc.html

   1 <script>
   2 function test()
   3 {
   4     if (window.testRunner) {
   5         testRunner.dumpAsText();
   6         testRunner.waitUntilDone();
   7     }
   8
   9     var counter = 0;
  10     var worker = new Worker("resources/wrapper-map-gc.js");
  11
  12     // Post the message from worker back to the worker.
  13     // This will fire another onmessage event in the Worker and allocate more data.
  14     worker.onmessage = function(evt)
  15     {
  16         worker.postMessage(evt.data);
  17         // This appears to be enough to reliably trigger GC in a Worker (about 20Mb strings allocated).
  18         if (++counter > 20) {
  19             document.getElementById("result").innerText = "PASS";
  20             worker.terminate();
  21             if (window.testRunner) {
  22                 testRunner.notifyDone();
  23             }
  24         }
  25     }
  26 }
  27 </script>
  28 <body onload=test()>
  29 <p>This test tries to cause GC in Worker context. It also fires events in the Worker, which allocates JS DOM Wrappers for Event object. As a result of GC, the maps that map wrappers to DOM Objects will be cleaned up. Test succeeds if it does not crash and prints 'PASS' at the end.</p>
  30 <pre id="result"></pre>
  31 </body>
  32 </html>