Rob Wu
7da0fc6819
The _startIdleDispatch uses `ChromeUtils.idleDispatch`, which may keep the DeferredTask instance alive longer than necessary, which in turn prevents the task callback and its closure from being garbage collected. This has resulted in observed window leaks at the end of test runs. To prevent this issue from happening, we automatically detect whether the callback belongs to a window, and if so, tie the (idle) timers to that window, so that the callbacks are immediately released when that window unloads. We also clear the callback reference when `finalize()` is called, so that the task callback and its closure are not kept alive for longer than necessary (upon unload), even if the window is still alive. Differential Revision: https://phabricator.services.mozilla.com/D284782
54 lines
1.2 KiB
JavaScript
54 lines
1.2 KiB
JavaScript
"use strict";
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/* globals window */ // We are running in a document.
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// Test the basics of DeferredTask in a window context:
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// - Schedules several uses of DeferredTask that should not run at all
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// - Schedules final DeferredTask that should run quickly at the end.
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const { DeferredTask } = ChromeUtils.importESModule(
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"resource://gre/modules/DeferredTask.sys.mjs"
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);
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// Sanity checks: tasks that should never run.
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const task1 = new DeferredTask(
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() => {
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window.postMessage("arm_and_disarm_should_never_run", "*");
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},
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0,
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0
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);
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task1.arm();
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task1.disarm();
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const task2 = new DeferredTask(
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() => {
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window.postMessage("arm_and_finalize_should_never_run", "*");
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},
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0,
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0
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);
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task2.arm();
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task2.disarm();
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// Store as variable to make sure that we continue to have a strong reference,
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// and that non-running of the callback is not due to GC or something.
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// eslint-disable-next-line no-unused-vars
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const task3 = new DeferredTask(
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() => {
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window.postMessage("without_arm_should_never_run", "*");
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},
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0,
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0
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);
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const task4 = new DeferredTask(
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() => {
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// test_DeferredTask_window.js expects this message:
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window.postMessage("arm_and_wait_should_run", "*");
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},
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12,
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34
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);
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task4.arm();
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