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child_process.fork - process.send does not return message


child_process.fork - process.send does not return message

By : Edin Turbo
Date : November 14 2020, 04:51 PM
I think the issue was by ths following , Move your process.send(m); outside of the message event handler. Otherwise you're adding a new message event handler for every query and those event handlers only fire when the parent process sends it a message. Example:
code :
var channel = pusher.subscribe("ticker.160");
channel.bind("message", function(data) {
    this.data = data;

    /**
     * save data to db
     */
    var trade  = {
      timestamp           : data.trade.timestamp,
      price               : data.trade.topbuy.price, 
    };
    var query = connection.query('INSERT INTO trades SET ?',
                                 trade,
                                 function(err, result) {
      if (err) { 
        connection.rollback(function() {
          throw err;
        });
        return;
      }  

      //push message back to the app.js
      m = "insert happened";
      process.send(m);

      connection.commit(function(err) {
        if (err) { 
          connection.rollback(function() {
            throw err;
          });
        }
      });
    });
});


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What are the effective differences between child_process.fork and cluster.fork?

What are the effective differences between child_process.fork and cluster.fork?


By : G.J.
Date : March 29 2020, 07:55 AM
I hope this helps you . cluser.fork is implemented on top of child_process.fork. The extra stuff that cluster.fork brings is that, it will enable you to listen on a shared port. If you don't want it, just use child_process.fork. So yeah, use cluster for web servers and child_process for workers.
fork and signal: how to send signals from parent process to specific child process

fork and signal: how to send signals from parent process to specific child process


By : Robert de Almeida Bo
Date : March 29 2020, 07:55 AM
it should still fix some issue you could use the popen() function to open a process by forking and opening a pipe to that process (instead of using fork() directly)
The parent knows the PID of each process so can then easily pass the pid of the second child to the first child.
How can I debug a child_process fork process from visual studio code

How can I debug a child_process fork process from visual studio code


By : Reyhan Sahputra
Date : March 29 2020, 07:55 AM
this one helps. Executing child_process.fork from a parent node process that was started with an inspect-brk option active will cause this error if you don't manually specify a different inspect-brk port or remove the option.
Here's the line of code in the node.js source that causes this to happen
code :
import { expect } from 'chai';
import { fork } from 'child_process';
import path from 'path';

describe('Child Process Fork', () => {
  it('Successfully Forks A Simple Process', (done) => {
    const child = fork(path.join(__dirname, 'SimplyExit.js'), [], { stdio: 'pipe', execArgv: [] });
    child.on('exit', (data) => {
      expect(data).to.equal(0);
      done();
    });
  });
});
Missing message when using child_process.send in CoffeeScript

Missing message when using child_process.send in CoffeeScript


By : Riky91
Date : March 29 2020, 07:55 AM
I wish this helpful for you Unfortunately this isn't as simple as a scoping issue. The problem is your fork command, which in the JS case will start a new node process, and in the CoffeeScript case will start a new coffee process.
I can't say for sure without lots of time hunting, but the issue is a difference in their startup/compilation time, or something related to that.
In electronjs , what is the advantage of using child_process.fork in Main Process then in Renderer Process

In electronjs , what is the advantage of using child_process.fork in Main Process then in Renderer Process


By : user5494213
Date : March 29 2020, 07:55 AM
help you fix your problem Honestly I would not use child_process. Every Electron window has its own process so I would just run heavy tasks in their own Electron window. This also gives you access all of Node, Electron (and its IPC module), and the DOM. Basically everything JS has to offer :)
This way your main process can be left for core functionality and whatever UI you need will be in its own Electron window with no UI lag. The Electron Quickstart has more info on how processes are handled in Electron.
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