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We currently mark a number of `ArrayBuffer`s as not transferable, including the `Buffer` pool and ones with finalizers provided by C++ addons. There is no good reason to assume that userland code might not encounter similar problems, for example when doing `ArrayBuffer` pooling similar to ours. Therefore, provide an API that lets userland code also mark objects as not transferable. PR-URL: https://github.com/nodejs/node/pull/33979 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Gus Caplan <me@gus.host>
38 lines
1005 B
JavaScript
38 lines
1005 B
JavaScript
'use strict';
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const common = require('../common');
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const assert = require('assert');
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const { MessageChannel, markAsUntransferable } = require('worker_threads');
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{
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const ab = new ArrayBuffer(8);
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markAsUntransferable(ab);
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assert.strictEqual(ab.byteLength, 8);
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const { port1, port2 } = new MessageChannel();
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port1.postMessage(ab, [ ab ]);
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assert.strictEqual(ab.byteLength, 8); // The AB is not detached.
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port2.once('message', common.mustCall());
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}
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{
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const channel1 = new MessageChannel();
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const channel2 = new MessageChannel();
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markAsUntransferable(channel2.port1);
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assert.throws(() => {
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channel1.port1.postMessage(channel2.port1, [ channel2.port1 ]);
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}, /was found in message but not listed in transferList/);
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channel2.port1.postMessage('still works, not closed/transferred');
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channel2.port2.once('message', common.mustCall());
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}
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{
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for (const value of [0, null, false, true, undefined, [], {}]) {
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markAsUntransferable(value); // Has no visible effect.
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}
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}
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