Node.js Worker.isMainThread 属性
原文:https://www . geesforgeks . org/node-js-worker-ismainthread-property/
worker_threads 模块中 Worker 类的内置应用程序编程接口Worker . IsInthread属性用于检查当前线程是否在 Worker 线程中运行。
语法:
const Worker.isMainThread
参数:该属性不接受任何参数。
返回值:如果当前线程不在工作线程内运行，则该属性返回布尔值 true，否则返回 false。
示例 1: 文件名:index.js
// Node.js program to demonstrate
// the Worker.isMainThread API
// Importing worker_thread module
const { Worker, isMainThread } = require('worker_threads');
// Checking if the current thread is inside the
// Main thread or not by using IsMainThread API
if (isMainThread) {
console.log('OutSide Worker!2');
console.log('1');
console.log('2');
console.log('3');
console.log(isMainThread);
}
使用以下命令运行 index.js 文件:
node index.js
输出:
OutSide Worker!2
1
2
3
true
示例 2: 文件名:
// Node.js program to demonstrate the
// Worker.isMainThread API
// Importing worker_thread module
const { Worker, isMainThread }
= require('worker_threads');
// Checking if the current thread is
// inside the main thread or not
// by using IsMainThread API
if (isMainThread) {
// This re-loads the current file
// inside a Worker instance.
new Worker(__filename);
} else {
console.log('Inside Worker!2');
console.log('1');
console.log('2');
console.log('3');
console.log(isMainThread);
}
使用以下命令运行 index.js 文件:
node index.js
输出:
Inside Worker!2
1
2
3
false
参考:T2】https://nodejs . org/dist/latest-v 12 . x/docs/API/worker _ threads . html # worker _ threads _ worker _ ismainthread
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