| <!doctype html> |
| <title>Scheduling API: Task Cancellation</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 = ''; |
| let task_controllers = []; |
| |
| for (let i = 0; i < 5; i++) { |
| let tc = new TaskController(); |
| let task = scheduler.postTask(() => { |
| result += i.toString(); |
| }, { signal: tc.signal }); |
| if (i == 2) { |
| task.then(() => { |
| assert_unreached('This task should have been aborted'); |
| }); |
| } else { |
| task.catch(() => { |
| assert_unreached('This task should complete'); |
| }); |
| } |
| task_controllers.push(tc); |
| } |
| |
| task_controllers[2].abort(); |
| scheduler.postTask(t.step_func(() => { |
| assert_equals(result, '0134'); |
| })); |
| |
| let final_task_tc = new TaskController(); |
| // Check that canceling running, completed, or canceled tasks is a no-op. |
| scheduler.postTask(t.step_func_done(() => { |
| final_task_tc.abort(); |
| task_controllers[2].abort(); |
| task_controllers[0].abort(); |
| }), { signal: final_task_tc.signal }); |
| |
| }, 'Test canceling a task'); |
| |
| </script> |
