What is Blocking?

What is Non-Blocking ?

It refers to the blocking of further operation until the current operation finishes. Blocking methods are executed synchronously. Synchronously means that the program is executed line by line. The program waits until the called function or the operation returns.

Example: Following example uses the readFileSync() function to read files and demonstrate Blocking in Node.js

Javascript

const fs = require('fs');
  
const filepath = 'text.txt';
 
// Reads a file in a synchronous and blocking way 
const data = fs.readFileSync(filepath, {encoding: 'utf8'});
 
// Prints the content of file
console.log(data);
 
// This section calculates the sum of numbers from 1 to 10
let sum = 0;
for(let i=1; i<=10; i++){
    sum = sum + i;
}
 
// Prints the sum
console.log('Sum: ', sum);

Run the index.js file using the following command:

node index.js

Output:

This is from text file.
Sum:  55

Blocking and Non-Blocking in Node

Node is based on an event-driven non-blocking I/O model. This article discusses what does Blocking and Non-Blocking in Node means.

Table of Content

What is Blocking?
What is Non-Blocking ?
How Concurrency and throughput is handled?
Drawback of mixing Blocking and Non-Blocking Code

Tags:

#Node.js-Basics #NodeJS-function #Node.js #Web Technologies

What is Non-Blocking ?

What is Blocking?

Javascript

Blocking and Non-Blocking in Node

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