Event loop refers to an infinite cycle of actions which is used for processing data based on callbacks and messages.
An event loop watches for I/O and timer state changes. It queues functions while waiting for unavailable resources, then dispatches them when resources are available.
I'm trying to understand node.js single threaded architecture and the eventloop to make our application more efficient. So consider this scenario where I have to make several database calls for an http api call. I can do it using Promise.all() or…
According to https://nodejs.org/api/cluster.html#cluster_cluster, one should run the same number of Node.js processes in parallel as the number of cores on the machine.
The supposed reasoning behind this is that Node.js is single threaded.
However,…
I am faced with the mention of render queue in different articles (example, example)
Both authors say that
render callback is given the highest priority
Is it true?
Does render queue exist as separate queue or is
it alias for render…
How to continue to next loop when awaiting? For example:
async def get_message():
# async get message from queue
return message
async process_message(message):
# make some changes on message
return message
async def…
Is there any way I can see the microtask queue? or test if the microtask is blocking the macrotask queue?
This is a real issue not being able to see the queuej.
I have a websocket application that I am building a game on, built on Ratchet which uses the React event loop. At the start of this script, I have already figured out how to implement a periodictimer, to send a pulse to the game every second, and…
I am learning Promise, in order to understand it I read a bit about Event loop of JavaScript. This article briefly introduced the working of event loop such as call stack, event table and message queue.
But I don't know how the call stack deal with…
Clause 2.2.4 of the promise/a+ spec says:
onFulfilled or onRejected must not be called until the execution
context stack contains only platform code.
Then in the notes it states that:
Here “platform code” means engine, environment, and promise
…
Calling QCoreApplication::hasPendingEvents() or QAbstractEventDispatcher::instance()->hasPendingEvents() inside of a thread works just fine. However, outside of it, the latter one (with appropriate parameter) always returns false (former cannot be…
I would like to confirm what I believe is a straightforward aspect of worker threads in Qt.
Suppose I create a QThread whose purpose is to manage time-consuming work in its corresponding thread. Furthermore, suppose I allow this thread's…
I am trying to write a Node.js program to execute and monitor javascript programs. I am looking for a way to find out whether the monitored program is still "running" i.e. doing anything useful.
In my current approach, when receiving code to test, I…
I've had so many problems with this (usually with page load events being executed before button click events from the previous page) that I decided to look it up and post the event loop ordering:
Method Called …
I have the following simple http server using Node.js:
var http = require('http');
var server = http.createServer(function(req, res) {
var counter = 0;
for(var i = 1; i <= 30; i++) {
http.get({ host: "www.google.com" }, function(r)…
