f226350fcb
PR-URL: https://github.com/nodejs/node/pull/47251 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Richard Lau <rlau@redhat.com>
57 lines
1.7 KiB
JavaScript
57 lines
1.7 KiB
JavaScript
// Copyright 2018 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --expose-gc --noincremental-marking
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// This test asserts that the cleanup function call, scheduled by GC, is
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// not a microtask but a normal task.
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(async function () {
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let microtaskInvoked = false;
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const microtask = () => {
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assertFalse(cleanedUp);
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assertFalse(microtaskInvoked);
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microtaskInvoked = true;
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};
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let cleanedUp = false;
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const cleanup = (holdings) => {
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assertFalse(cleanedUp);
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assertTrue(microtaskInvoked);
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cleanedUp = true;
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};
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const fg = new FinalizationRegistry(cleanup);
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(function() {
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// Use a closure here to avoid other references to object which might keep
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// it alive (e.g., stack frames pointing to it).
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const object = {};
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fg.register(object, {});
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})();
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// The GC will schedule the cleanup as a regular task.
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// We need to invoke GC asynchronously and wait for it to finish, so that
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// it doesn't need to scan the stack. Otherwise, the objects may not be
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// reclaimed because of conservative stack scanning and the test may not
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// work as intended.
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await gc({ type: 'major', execution: 'async' });
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assertFalse(cleanedUp);
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// Schedule the microtask.
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Promise.resolve().then(microtask);
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// Nothing else hasn't been called yet, as we're still in synchronous
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// execution.
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assertFalse(microtaskInvoked);
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assertFalse(cleanedUp);
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// The microtask and the cleanup callbacks will verify that these two are
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// invoked in the right order: microtask -> cleanup.
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setTimeout(() => { assertTrue(cleanedUp); }, 0);
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})();
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