| <!doctype html> |
| <title>Scheduling API: Tasks Run in Priority Order</title> |
| <link rel="author" title="Scott Haseley" href="mailto:shaseley@chromium.org"> |
| <link rel="help" href="https://github.com/WICG/main-thread-scheduling"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <script> |
| 'use strict'; |
| |
| async_test(t => { |
| let result = ''; |
| |
| function report(id) { |
| result = result === '' ? id : result + ' ' + id; |
| } |
| |
| function scheduleReportTask(id, priority) { |
| scheduler.postTask(() => { |
| report(id); |
| }, { priority }); |
| } |
| |
| // Post tasks in reverse priority order and expect they are run from highest |
| // to lowest priority. |
| scheduleReportTask('B1', 'background'); |
| scheduleReportTask('B2', 'background'); |
| scheduleReportTask('UV1', 'user-visible'); |
| scheduleReportTask('UV2', 'user-visible'); |
| scheduleReportTask('UB1', 'user-blocking'); |
| scheduleReportTask('UB2', 'user-blocking'); |
| |
| scheduler.postTask(t.step_func_done(() => { |
| assert_equals(result, 'UB1 UB2 UV1 UV2 B1 B2'); |
| }), { priority: 'background' }); |
| }, 'Test scheduler.postTask task run in priority order'); |
| |
| </script> |
