42 lines
1.4 KiB
JavaScript
42 lines
1.4 KiB
JavaScript
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// Copyright 2022 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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//
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// Flags: --shared-string-table --harmony-struct --allow-natives-syntax
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"use strict";
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if (this.Worker) {
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(function TestSharedStructPostMessage() {
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let workerScript =
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`onmessage = function(struct) {
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// Non-atomic write that will be made visible once main thread
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// observes the atomic write below.
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struct.struct_field.payload = 42;
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Atomics.store(struct, "string_field", "worker");
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};
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postMessage("started");`;
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let worker = new Worker(workerScript, { type: 'string' });
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let started = worker.getMessage();
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assertEquals("started", started);
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let OuterStruct = new SharedStructType(['string_field', 'struct_field']);
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let InnerStruct = new SharedStructType(['payload']);
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let struct = new OuterStruct();
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struct.struct_field = new InnerStruct();
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struct.string_field = "main";
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assertEquals("main", struct.string_field);
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assertEquals(undefined, struct.struct_field.payload);
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worker.postMessage(struct);
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// Spin until we observe the worker's write of string_field.
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while (Atomics.load(struct, "string_field") !== "worker") {}
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// The non-atomic store write must also be visible.
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assertEquals(42, struct.struct_field.payload);
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worker.terminate();
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})();
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}
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