9d7cd9b864
PR-URL: https://github.com/nodejs/node/pull/54077 Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Richard Lau <rlau@redhat.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
46 lines
1.5 KiB
JavaScript
46 lines
1.5 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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(async function () {
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let cleanup_call_count = 0;
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let cleanup = function (holdings) {
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++cleanup_call_count;
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}
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let fg1 = new FinalizationRegistry(cleanup);
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let fg2 = new FinalizationRegistry(cleanup);
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// Create two objects and register them in FinalizationRegistries. The objects need
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// to be inside a closure so that we can reliably kill them!
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(function () {
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let object1 = {};
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fg1.register(object1, "holdings1");
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let object2 = {};
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fg2.register(object2, "holdings2");
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// object1 and object2 go out of scope.
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})();
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// This GC will discover dirty WeakCells and schedule cleanup.
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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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assertEquals(0, cleanup_call_count);
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// Wait two ticks, so that the finalization registry cleanup has an
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// opportunity to both run and re-post itself.
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await new Promise(resolve=>setTimeout(resolve, 0));
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await new Promise(resolve=>setTimeout(resolve, 0));
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// Assert that the cleanup function was called.
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assertEquals(2, cleanup_call_count);
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})();
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