node/test/parallel/test-worker-arraybuffer-zerofill.js

'use strict';
require('../common');
const assert = require('assert');
const { Worker } = require('worker_threads');

// Make sure that allocating uninitialized ArrayBuffers in one thread does not
// affect the zero-initialization in other threads.

const w = new Worker(`
const { parentPort } = require('worker_threads');

function post() {
  const uint32array = new Uint32Array(64);
  parentPort.postMessage(uint32array.reduce((a, b) => a + b));
}

setInterval(post, 0);
`, { eval: true });

function allocBuffers() {
  Buffer.allocUnsafe(32 * 1024 * 1024);
}

const interval = setInterval(allocBuffers, 0);

let messages = 0;
w.on('message', (sum) => {
  assert.strictEqual(sum, 0);
  if (messages++ === 100) {
    clearInterval(interval);
    w.terminate();
  }
});