d59db06bf5
Bug: v8:8179 Change-Id: I7f699073807d1874d0c10a4f1641de6bfb0efe6f Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2741582 Commit-Queue: Shu-yu Guo <syg@chromium.org> Reviewed-by: Shu-yu Guo <syg@chromium.org> Reviewed-by: Adam Klein <adamk@chromium.org> Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org> Cr-Commit-Position: refs/heads/master@{#73871}
62 lines
1.5 KiB
JavaScript
62 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 --allow-natives-syntax
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// This test asserts that the cleanup function call, scheduled by GC, is a
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// microtask and not a normal task.
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// Inside a microtask, cause GC (which should schedule the cleanup as
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// microtask). lso schedule another microtask. Assert that the cleanup
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// function ran before the other microtask.
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let cleanedUp = false;
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function scheduleMicrotask(func) {
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Promise.resolve().then(func);
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}
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let log = [];
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let cleanup = (holdings) => {
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cleanedUp = true;
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}
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let fg = new FinalizationRegistry(cleanup);
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let o = null;
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(function() {
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// Use a closure here to avoid other references to o which might keep it alive
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// (e.g., stack frames pointing to it).
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o = {};
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fg.register(o, {});
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})();
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let microtask = function() {
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log.push("first_microtask");
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// cause GC during a microtask
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o = null;
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gc();
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}
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assertFalse(cleanedUp);
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// enqueue microtask that triggers GC
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Promise.resolve().then(microtask);
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// but cleanup callback hasn't been called yet, as we're still in
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// synchronous execution
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assertFalse(cleanedUp);
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// flush the microtask queue to run the microtask that triggers GC
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%PerformMicrotaskCheckpoint();
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// still no cleanup callback, because it runs after as a separate task
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assertFalse(cleanedUp);
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setTimeout(() => {
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assertTrue(cleanedUp);
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}, 0);
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