Questions tagged [asynchronous]
Asynchronous programming is simply allowing some portions of code to be executed on separate threads. It makes your applications perform better, be more responsive, and use the resources of the system they are running on to the fullest extent.
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Running a spawn_local task inside LocalSet
I'm having issues with the use of tokio::task::spawn_local and tokio::task::LocalSet. Examples I see on rust docs show a single ...
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Debounced inotify watcher in rust
Here is a tiny (cli) tool to run a script with the state of any of a set of watched files when one of them is opened or closed. It applies basic debouncing to handle bursty access. It was written to ...
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C++ Readers-Writer Lock using Asio's Strands
The locking mechanism is implemented in the class RW_Lock.
The saved_async_completion_handler structure is used in ...
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For loop vs If statement using conditional variable
I'm extending the sync.Pool type by limiting the amount of objects that can reside outside the pool. To achieve this I'm using ...
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C++: algorithm that uses fixed-size buffer of data that are produced in stream, faster than the algorithm speed
I try to implement this scenario with a producer/consumer multithread pattern and I'd like to optimize synchronization and memory model directive used.
This code originates from a SO question and its ...
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Single worker, multiple async callers in different threads
My use case is this:
There is a long running process that I want to ensure is only ever running at most only a single time.
Multiple consumers from different threads may wait on the calculation.
If ...
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Get files downloaded asynchronously after double clicking on list item (C++)
The problem I am trying to solve as an exercise is as follows:
I have a UI running in the main thread, specifically a list view with many items. Each item represents a file that the user can download....
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Code for asynchronous data stream processing with multistage pipelines
I am trying to write some code for processing streams of asynchronous data from multiple sources (Producer Nodes), process them ...
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Visualizing a mashup API in Postman
The MusicBrainz API has information about artists and music
bands.
1
An example – a request for the British rock band Coldplay is:
http://musicbrainz.org/ws/2/artist/cc197bad-dc9c-440d-a5b5-...
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UIImageView loading from URL with cancellable task and safe to use in a UICollectionView
I am trying to make a UIImageView class / extension that can load an image from a URL.
the image view should not get confused with concurrency when scrolling through a UICollectionView and the data ...
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Asynchronously building a service container in TypeScript
The compiler provides a synchronous use() method which accepts a middleware - that is a function that creates any services it wants, the ...
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Asynchronous file writer : queue, mutex, condition variable
As we know, it is better to write to a disk in a separate thread because the bottleneck may be the disk, which is slower than the CPU (at the condition only one thread writes to the disk).
So I have ...
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Tool for asynchronous IPC using pipes
Description of the code:
The code provides asynchronous IPC functionality in C++ using the Boost libraries and pipes.
Each process asynchronously "listens" on the read end of the pipe and ...
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Asynchronous DB session in Python (used in ASGI framework such as Sanic)
I've been working with Sanic as my default web framework, but coming from Flask, I had some issue with how to handle the database connection.
So I built an asynchronous wrapper around it.
I've also ...
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Make C++ Task class similiar to C#'s Task
I am enjoying making various programs with C++.
This is my first code review request. And I hope I can get some insights or might have good advice to make my code better.
I make a task class using C++...
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265
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SetTimeout to populate Javascript Object while a function looped AJAX requests to get data
I wrote some code that will get the name and data of a node or multiple of nodes and put them in an object (seriesData) so I can use said object for a chart (renderChart). I used setTimeout() so ...
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Wait for a callback and then using the result
I'm using Frida to run a script on a process, and I want to wait for it to send the result back to me, as a callback.
My current code looks like this:
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Load data from database, change it asynchronously and return the new data
I have written this function to load data from the database, change it asynchronously and return the new data. It appears to work fine, but since I am new to Kotlin, I wanted to ask if this code is ok ...
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Promise in an Express app to send OTP verification e-mail
In this code I'm using nodemailer for sending otp email from my gmail account. I have also used ejs for creating html templates for emails.
This code works perfectly, but I am a bit concerned about ...
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Using Swift Combine's .map function with external variables
I have a motionManager class which uses CMMotionManager() to send rotationRate and attitude values to a publisher in the form of a MotionValueModel.
...
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338
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Game loop using Future.wait_for to check for input
I started writing this game from scratch yesterday, and I wasn't completely new to C++'s future library.
I only use the ...
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ASP.NET Core 6 background DB logger
In an application, many actions need to be logged in the database. but this logging process should not slow down the request. So they should be done in an asynchronous queue or something.
This is my ...
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Filtering an Option Result using a boolean Result in Rust
I'm trying to rewrite one of my pet projects in Rust, and when I was faced with the problem of filtering a Result<Option<T>, E> via a ...
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Java class to run CompletableFuture<T> instances in batches
This is a utility class for running CompletableFuture<T>s in batches (e.g. to avoid using too much bandwidth making HTTP requests). It seems to work, but I'm ...
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Asynchronous recursive function for generating a unique Id
The code below is my first purpose built asynchronous recursive function. It took me a while to figure out how to write the thing, and I would like a second opinion.
It's part of a project for The ...
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Asynchronous socket server implementation from raw sockets
I've rewritten my HTTP server several times over the past year, because I tend to encounter an issue midway through an implementation realizing I didn't abstract, decompose, or decouple certain ...
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Javascript function which polls an async endpoint and inserts the result in a web page
I read about debounce this morning and ended up needing something similar to the concept in real life this evening to build a poll that checks whether a link I receive from an async call is ready to ...
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Collect and combine results of async calls returning completable futures in Java in a cleaner way?
I need an abstract way to implement this below functionality because in my code I have to use it in multiple places with different REST endpoints. If I ignore it will cause code duplication.
Please ...
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703
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Blocking call to an async function
While migrating to structured concurrency it may be sometimes convenient to temporarily make a blocking call to an async function - e.g.:
...
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47
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Synchronous Lock system with asynchronous methods
I needed a way to ensure that a function called was done only one at a time. Because of how Javascript is done and with Asynchronous functions, this wasn't the case, and there could be concurrency ...
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Resilient & Stable TCP Server Polling
I am looking for feedback to perfect my code developed for WPF in terms of speed, stability and resiliency. My code is supposed to handle synchronous status polling as well as asynchronous Commands to ...
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Task-based TCP socket wrapper class
Recently I've been entertaining the idea of making a small encrypted chat app as a way to learn about UI, encryption and networking in C#. After some research/work, I've produced the below protocol ...
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group countries by language in JavaScript
I need a better implementation than the below code (O(N) Solution), I am grouping countries by language ( data ) is the countries JSON, each country could have 0, 1 .. or more language as the object ...
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Asynchronous TCP server refactor design & not working features
I'm working on an asynchronous TCP server which is supposed to be used for a chat. I want to get a review for the TCP server part because I'm struggling to find a good design to fulfill the following ...
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React async useEffect with loading and error state
This is my first time trying to add clean error handling and loading notification for async requests in my project. It looks kind of bulky to me, but maybe that's because I'm inexperienced? This is ...
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A reuseable reconnecting TCP socket with Asio
I'm using (non-boost) Asio 1.18.1 and C++17. Forgive the boost tag, there wasn't a more specific one.
I have a async_connect_with_retry composed asynchronous ...
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70
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Asynchronous line-based communication with an external program
As part of a larger project, I've written the following code for interacting with git-annex's addurl command in batch mode. ...
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Learning asynchronous caching by implementing one
After implementing a serial CLOCK second-chance cache in C++ without having enough rope to shoot myself in the foot, decided to dive into Javascript through NodeJs and write an asynchronous one. I ...
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Using the Decoder class in a streaming context
Am experimenting with the IAsyncEnumerable interface and PipeReader class. Have come up with the following to decode a stream of bytes into chunks of characters and am able to decode all of my test ...
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Implement Websocket using boost::asio::beast with serialized writes
Here's a proposal implementation of websocket using boost::asio::beast that is thread-safe to parallel writes.
In this example below, the ...
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Best way of cleaning up resources with CompletableFuture [closed]
Edit: cross-posted this question on Stackoverflow.
Suppose I have a function that takes a FileInputStream, performs some operation using the file data in the ...
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My 3D to 2D graphics algorithm is being a bit slow
With my VB.Net Windows Forms application, I would like to rotate and project a 3D object. The program works so far, which is why I'm reporting here and not Stack Overflow, but it's slow.
I've already ...
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Converting python code to async calls
I'm going to start out by saying this is the 1st python program I have ever written and have no real background in the language so my code is probably pretty rough. Take it easy on me!
When I wrote ...
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Async streaming of Reddit posts
roux is a Rust library that wraps the Reddit API. Neither Reddit nor roux provides a stream-like interface for obtaining the ...
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Are nested calls to `asyncio.gather()` dangerous?
I wrote this ~100 line script recently, where I tried out Python's asyncio library. When it comes to asynchronous programming in Python, I just have 2 days of ...
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Read Data from a serial port and write to influxdb
I have a energy meter which sends the kWh count periodically every few seconds via a serial port.
To store this data I write the counter value and the calculated average power of the last 10s in a ...
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Async download of files
The following code is an async beginner exploration into asynchronous file downloads, to try and improve the download time of files from a specific website.
Tasks:
The tasks are as follows:
Visit ...
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Fixed-width non-FIFO DispatchQueue
I have implemented a custom concurrent queue on top of GCD which offers two additional pieces of functionality:
Limit the maximum number of concurrently executing tasks.
Give manual control over ...
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Idea for writing asynchronous data processing chains easier (similar to `ReactiveX`) and its implementation
I'm writing my own library, that is for asynchronous network communication. and then, wanna write my own HTTP proxy server for load-balancing connections to backend servers with it.
when I'm using <...
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