| <!DOCTYPE html> |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <script type="module"> |
| |
| // Keep FinalizationRegistry global to avoid it being reclaimed by garbage |
| // collections that may happen until the registry is processed in microtasks. |
| let fr1; |
| let fr2; |
| |
| async_test(t => { |
| let last_task_that_ran = ""; |
| let num_microtasks_that_ran = 0; |
| |
| const callback = () => { |
| last_task_that_ran = 'finalizer'; |
| Promise.resolve().then(t.step_func(function() { |
| assert_equals(last_task_that_ran, 'finalizer'); |
| last_task_that_ran = 'microtask'; |
| // The two FinalizationRegistries below run their finalizers in two |
| // separate tasks. Those tasks should be each followed by a microtask |
| // checkpoint, thus the counter here. |
| if (++num_microtasks_that_ran == 2) t.done(); |
| })); |
| }; |
| |
| fr1 = new FinalizationRegistry(callback); |
| fr2 = new FinalizationRegistry(callback); |
| |
| (function() { |
| let garbage = {}; |
| fr1.register(garbage, 'holdings1'); |
| fr2.register(garbage, 'holdings2'); |
| garbage = null; |
| })(); |
| |
| gc(); |
| }, 'FinalizationRegistry finalizers have a microtask checkpoint on completion'); |
| </script> |
