Node.js is a single-threaded event-driven platform that is capable of running non-blocking, asynchronous programming. - eventloop nodejsdeveloper
Each phase has a FIFO queue of callbacks to execute. When the event loop enters a given phase, it will perform any operations specific to that phase and then execute callbacks on that phase’s queue until either the queue is exhausted, or until the maximum number of callbacks is fulfilled. When the queue is exhausted or the callback limit is reached, the event loop will move to the next phase.
Also this library is responsible for providing Nodejs with multithreading or the ability to provide a pool of threads in a Nodejs process for synchronous tasks to ride on. The thread pool consists of four threads, created to handle heavy-duty tasks that shouldn’t be on the main thread. And with this set-up, our application is not blocked by these tasks.All zlib APIs that are synchronousThe above list can be further categorised into CPU-intensive operations and I/O-intensive operations.
So when Node.js is reading file, it executes synchronously consoles .the rest of the asynchronous operations will be divided into micro and macro tasks, after the execution of the synchronous code, our Event Loop starts working.The order of execution of asynchronous operations presented below:The first thing to note is that your code in Nodejs is single-threaded. And this does not mean that Node is running on a single thread.
By itself, V8 works one thread but with the help the Libuv library is using the event Loop, distribute operations into different queues , and for some heavy operations, after which the Event Loop, according to the underlying mechanism, starts sending callbacks for execution to the main thread.Hope it was useful for you!
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