相思资源网 Design By www.200059.com

最近在写一些奇怪的东西的时候,发现大佬们用go或者其他语言实现的并发任务用了thread.sleep让主进程暂停。

回头一想,妈个鸡我要复制粘贴到node一直循环不合适啊,我也需要暂停来着!

怎么办??

抓了脑袋一会去npm上找了下相关的包,发现有个叫thread-sleep的包,下载量还挺高。

抱着好奇心去看了下源码,又发现源码相当之骚气

'use strict';

var childProcess = require('child_process');
var nodeBin = process.argv[0];

module.exports = sleep;
function sleep(milliseconds) {
 var start = Date.now();
 if (milliseconds !== Math.floor(milliseconds)) {
  throw new TypeError('sleep only accepts an integer number of milliseconds');
 } else if (milliseconds < 0) {
  throw new RangeError('sleep only accepts a positive number of milliseconds');
 } else if (milliseconds !== (milliseconds | 0)) {
  throw new RangeError('sleep duration out of range')
 }
 milliseconds = milliseconds | 0;

 var shouldEnd = start + milliseconds;
 try {
  childProcess.execFileSync(nodeBin, [ '-e',
   'setTimeout(function() {}, ' + shouldEnd + ' - Date.now());'
  ], {
   timeout: milliseconds,
  });
 } catch (ex) {
  if (ex.code !== 'ETIMEDOUT') {
   throw ex;
  }
 }
 var end = Date.now();
 return end - start;
}

黑人问号???

这是什么奇怪的实现。

翻阅node文档发现

Synchronous Process Creation#

The child_process.spawnSync(),
child_process.execSync(), and child_process.execFileSync() methods are synchronous and WILL block the Node.js event loop,
pausing execution of any additional code until the spawned process exits.

Blocking calls like these are mostly useful for simplifying general-purpose scripting tasks and for simplifying the loading/processing of application configuration at startup.
"text-align: center">node thread.sleep实现示例

所以很多时候我们没办法解决现有问题的原因是对文档不熟么??

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。

标签:
node,thread.sleep

相思资源网 Design By www.200059.com
广告合作:本站广告合作请联系QQ:858582 申请时备注:广告合作(否则不回)
免责声明:本站文章均来自网站采集或用户投稿,网站不提供任何软件下载或自行开发的软件! 如有用户或公司发现本站内容信息存在侵权行为,请邮件告知! 858582#qq.com
相思资源网 Design By www.200059.com

评论“node thread.sleep实现示例”

暂无node thread.sleep实现示例的评论...