标准输入输出的同步阻塞

Worker 利用通过 <MessagePort> 传入的消息来实现与 stdio 的交互。 这意味着来自 Worker 的 stdio 输出可能会被接收端的同步代码阻塞，这会阻塞 Node.js 事件循环。

import {
  Worker,
  isMainThread,
} from 'worker_threads';

if (isMainThread) {
  new Worker(new URL(import.meta.url));
  for (let n = 0; n < 1e10; n++) {
    // 循环模拟工作。
  }
} else {
  // 此输出将被主线程中的 for 循环阻塞。
  console.log('foo');
}'use strict';

const {
  Worker,
  isMainThread,
} = require('node:worker_threads');

if (isMainThread) {
  new Worker(__filename);
  for (let n = 0; n < 1e10; n++) {
    // 循环模拟工作。
  }
} else {
  // 此输出将被主线程中的 for 循环阻塞。
  console.log('foo');
}

Workers utilize message passing via <MessagePort> to implement interactions with stdio. This means that stdio output originating from a Worker can get blocked by synchronous code on the receiving end that is blocking the Node.js event loop.

import {
  Worker,
  isMainThread,
} from 'worker_threads';

if (isMainThread) {
  new Worker(new URL(import.meta.url));
  for (let n = 0; n < 1e10; n++) {
    // Looping to simulate work.
  }
} else {
  // This output will be blocked by the for loop in the main thread.
  console.log('foo');
}'use strict';

const {
  Worker,
  isMainThread,
} = require('node:worker_threads');

if (isMainThread) {
  new Worker(__filename);
  for (let n = 0; n < 1e10; n++) {
    // Looping to simulate work.
  }
} else {
  // This output will be blocked by the for loop in the main thread.
  console.log('foo');
}