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'we started experimenting with unit testing in Qt and would like to hear comments on a scenario that involves unit testing signals and slots.
Here is an example:
The code i would like to test is (m_socket is a pointer to QTcpSocket):
void…
GENERAL GOAL
I’d like to know how the following pieces of a javascript environment interconnect as a system.
Javascript Engine
Event Loop
Event Queue
We can limit this to a browser environment since node has been covered in another article…
I'd like to monitor how long each run of the event loop in node.js takes. However I'm uncertain about the best way to measure this. The best way I could come up with looks like this:
var interval = 500;
var interval = setInterval(function() {
…
So, I've been thinking about a brain teaser - what if I had a large object I for some reason had to iterate through in node js, and didn't want to block the event loop while I was doing that?
Here's an off-the-top-of-my-head example, I'm sure it can…
I have been doing some web application programming using GWT and have been confused by the term "browser event loop".
I have encountered situations where I need to execute deferred commands and "do something" after the browser event loop…
I have a Qt application with this kind of main()...
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MainWindow mainWin;
... A separate, non-GUI thread is launched here
mainWin.Init();
mainWin.show();
…
I keep hearing V8 has its rudimentary event loop implementation but
couldn't find it
doesn't really make sense to me. Methinks, the simplest design of a JS engine would be to simply run synchronously and let the "embedder" write their own event…
I wrote some code that has an epoll-eventloop, accepts new connections and pretends to be a http-server.
The posted code is the absolute minimum ... I removed everything (including all error-checks) to make it as short and to the point as…
I've read several posts/SO threads on event loop, and according to MDN's article,
When the stack is empty, a message is taken out of the queue and
processed.
As a JS novice, what I'm still confused about is -- when exactly does the call stack…
I have a web app built on a Python 3.5+ async framework (apistar, sanic, etc). The app makes various IO calls - to a database, Redis, etc - which are also async.
Some docs recommend using an additional event loop:
import asyncio
import peewee
from…
Is it possible to peek at the event loop for diagnostics?
I would like to know how many events are currently waiting for execution (excluding setTimeout/interval).
Update: I'd like to do this from inside the running node process.
In this answer to the question -
What is non-blocking or asynchronous I/O in Node.js?
the description sounds no different from the event loop in vanilla js. Is there a difference between the two? If not, is the Event loop simply re-branded as…
We've implemented monitoring for the Netty event loop queues in order to understand issues with some of our Netty modules.
The monitor uses the io.netty.util.concurrent.SingleThreadEventExecutor#pendingTasks method, which works for most modules, but…
How does the Call Stack behave when async/await functions are used ?
function resolveAfter2Seconds() { // taken from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function
return new Promise(resolve => {
…
What is the overhead of any asyncio task in terms of memory and speed? Is it ever worth minimising the number of tasks in cases when they don’t need to run concurrently?
