In Node there is no such start-the-event-loop call. Node simply enters the event loop after executing the input script. Node exits the event loop when there are no more callbacks to perform. This behavior is like browser JavaScript

What is Node.js?

Why does Node.js exists?

Blocking is when the execution of additional JavaScript in the Node.js process must wait until a non-JavaScript operation completes. This happens because the event loop is unable to continue running JavaScript while a blocking operation is occurring.

Blocking methods execute synchronously and non-blocking methods execute asynchronously.

JavaScript execution in Node.js is single threaded, so concurrency refers to the event loop's capacity to execute JavaScript callback functions after completing other work. Any code that is expected to run in a concurrent manner must allow the event loop to continue running as non-JavaScript operations, like I/O.

Node is similar in design to, and influenced by, systems like Ruby's Event Machine or Python's Twisted. Node takes the event model a bit further. It presents an event loop as a runtime construct instead of as a library.

The event loop is what allows Node.js to perform non-blocking I/O operations — despite the fact that JavaScript is single-threaded — by offloading operations to the system kernel whenever possible.

Since most modern kernels are multi-threaded, they can handle multiple operations executing in the background. When one of these operations completes, the kernel tells Node.js so that the appropriate callback may be added to the poll queue to eventually be executed.

When Node.js starts, it initializes the event loop, processes the provided input script (or drops into the REPL) which may make async API calls, schedule timers, or call process.nextTick(), then begins processing the event loop.

These are the phases of the event loop. Each phase has his own queue. timers pending callbacks idle, prepare poll <- incoming: connections, data etc. check close callbacks

Each phase has a FIFO queue of callbacks to execute.

While each phase is special in its own way, generally, when the event loop enters a given phase, it will perform any operations specific to that phase, then execute callbacks in that phase's queue until the queue has been exhausted or the maximum number of callbacks has executed

12:33 > This diagram looks basically identical for node, instead of web APIs we have C++ APIs and the threading is being hidden from you by C++

Just because Node is designed without threads, doesn't mean you cannot take advantage of multiple cores in your environment. Child processes can be spawned by using our child_process.fork() API

V8 The V8 library provides Node.js with a JavaScript engine, which Node.js controls via the V8 C++ API. V8 is maintained by Google, for use in Chrome.

V8 is Google’s open source high-performance JavaScript and WebAssembly engine, written in C++. It is used in Google Chrome, the open source browser from Google, and in Node.js, among others.

V8 implements ECMAScript and WebAssembly. Can run standalone, or can be embedded into any C++ application

Libuv, a C library that is used to abstract non-blocking I/O operations to a consistent interface across all supported platforms. It provides mechanisms to handle file system, DNS, network, child processes, pipes, signal handling, polling and streaming.

I don't care about being a star. I can do a supporting role; I don't have to be a lead.

There is nothing so momentary as a sporting achievement, and nothing so lasting as the memory of it.

All I can do is follow my instincts, because I'll never please everyone.

Buying a car used to be an experience so soul-scorching, so confidence-splattering, so existentially rattling that an entire car company was based on the promise that you wouldn't have to come in contact with it.

If this is coffee, please bring me some tea; but if this is tea, please bring me some coffee.

I was born in Patterson, New Jersey, and raised pretty much all around the country. My family tended to move from place to place following economic prospects and jobs and looking for new opportunities, so we changed schools, colleges, grade schools, high schools every 6 months to a year - depending on the breaks.

I myself am from a very poor background; I experienced firsthand poverty in this country, and that is not unrelated to my desire, from the moment I became president, to make a priority of poverty reduction in this country.

I'm so lucky to have such a great family. I respect them so much professionally, and they've been unconditionally supportive in the choices that I've made. It's been very good having them on my side.

'Straight Outta Compton' is my first biopic, my first period piece, and I got a chance to kind of get out there like some of my idols, you know, like Scorsese, Spielberg, Spike Lee, the guys who came before me. You know, I'm feeling good about it.

Everyone saying, 'She'll bring back women's skating. This will be the one to watch at the Olympics.' And they say things that are so far away, but really, you have to bring it back in and look at the next competition, the next day, what you want to accomplish because if you get too far ahead of yourself, you can trip yourself up.

I was a young film student around the time of the new wave in film in the 1970s; old Hollywood was naff and over. For me, as a film student, I was going to see French and Italian cinema; American cinema was 'Easy Rider' and 'Taxi Driver.' Everything was gritty.

Danger gleams like sunshine to a brave mans eyes.

That's the kind of motif I bring to the books - that people take charge of their own lives.

If I could I would always work in silence and obscurity, and let my efforts be known by their results.

Wherever the fates lead us let us follow.

A lot of moms give their kids line reads. My mom wasn't put in that position because I always had an acting teacher helping with the feelings rather than how to say something.

I'm not much into current electronic stuff, what I think of as lounge electronics, mumbling electronics.

Being a literature major, you know, I'm very familiar with the ways symbolism is used in our sort of mythic tales of society, so anyone who is consciously trying to pull that off I think is really interesting and clearly very smart.

Going to a movie is a two-hour experience; at $7.50 for a ticket, you are valuing your time at far less than the minimum wage. If you don't understand the film, don't leave. If you understand it all too well and hate it, get out of your seat and walk up the aisle. You will feel empowered.

Things are rarely as exciting or dramatic as we make them out to be in the press.

With fantasy, one often has to think of a well-loved series before narrowing the selection to a favourite book. So it is with Zelazny. I've read his 'Princes in Amber' books so often, I know them almost verbatim, so much so that I am now trying to forget them so I can return to them with renewed pleasure.

Hope is medicine for a soul thats sick and tired.

We don't pretend to disagree.

I am the luckiest man in the world.