| <!DOCTYPE html> |
| <html> |
| <body> |
| <script src="../../resources/runner.js"></script> |
| <script> |
| "use strict"; |
| |
| const targetBounces = 10000; |
| |
| const channel = new MessageChannel(); |
| const portA = channel.port1; |
| const portB = channel.port2; |
| |
| let bouncesRemaining = 0; |
| let iterationStart = 0; |
| |
| function onBounce(event) |
| { |
| if (--bouncesRemaining === 0) { |
| const elapsed = PerfTestRunner.now() - iterationStart; |
| if (!PerfTestRunner.measureValueAsync(elapsed)) |
| return; |
| setTimeout(runIteration, 0); |
| return; |
| } |
| event.target.postMessage(0); |
| } |
| |
| portA.onmessage = onBounce; |
| portB.onmessage = onBounce; |
| |
| function runIteration() |
| { |
| bouncesRemaining = targetBounces; |
| iterationStart = PerfTestRunner.now(); |
| portA.postMessage(0); |
| } |
| |
| PerfTestRunner.prepareToMeasureValuesAsync({ |
| description: 'Time to deliver ' + targetBounces + ' messages by ping-ponging between ' |
| + 'a single same-context MessagePort pair.', |
| unit: 'ms', |
| }); |
| |
| setTimeout(runIteration, 0); |
| </script> |
| </body> |
| </html> |
