| dimich@chromium.org | 7b54214 | 2009-09-05 03:54:10 +0000 | [diff] [blame] | 1 | <html> |
| 2 | <head> |
| 3 | <script> |
| 4 | function log(m) { |
| 5 | document.getElementById("log").innerHTML += m + "<br>"; |
| 6 | } |
| 7 | |
| 8 | var multiplyFactor = 2; // Create this many timers in every timer callback. |
| 9 | var targetLatency = 10000; // Multiply timers until it takes this much to fire all their callbacks. |
| 10 | var timerCount = 1; |
| 11 | |
| 12 | function timerCallback(creationTimestamp) { |
| 13 | --timerCount; |
| 14 | |
| 15 | if (!multiplyFactor) { |
| 16 | if (timerCount == 0) |
| 17 | log("No more timers - UI should be responsive now."); |
| 18 | return; |
| 19 | } |
| 20 | |
| 21 | // Create more timers. Capture the current time so when callbacks are fired, |
| 22 | // we can check how long it actually took (latency caused by a long timer queue). |
| 23 | var timestamp = new Date().getTime(); |
| 24 | for (i = 0; i < multiplyFactor; ++i) { |
| 25 | setTimeout(function() { timerCallback(timestamp); }, 0); |
| 26 | ++timerCount; |
| 27 | } |
| 28 | |
| 29 | // Once the timer queue gets long enough for the timer firing latency to be over the limit, |
| 30 | // stop multplying them and keep the number of timers constant. |
| 31 | if (multiplyFactor > 1 && new Date().getTime() - creationTimestamp > targetLatency) |
| 32 | multiplyFactor = 1; |
| 33 | } |
| 34 | |
| 35 | function runTest() { |
| 36 | log("Freezing UI..."); |
| 37 | setTimeout(function() { timerCallback(new Date().getTime()); }, 0); |
| 38 | setTimeout("multiplyFactor = 0; log('Finishing. Started to drain timers.');", 10000); |
| 39 | } |
| 40 | |
| 41 | </script> |
| 42 | </head> |
| 43 | <body onload="runTest()"> |
| 44 | This test will create enough timers to freeze browser UI. After 10 seconds, it |
| 45 | will start drain the timers so the UI becomes responsive again in a few seconds. |
| 46 | You don't need to kill the browser.<br>If the bug is fixed, there will be no |
| 47 | UI freeze. Refresh the page to repeat the experiment.<br>Try to click at this |
| 48 | button (or browser's menu) while UI is frozen: <button onclick="log('clicked')">Click Me</button> <hr> |
| 49 | <div id="log"></div> |
| 50 | </body> |
| 51 | </html> |
