Questions tagged [queue]
A queue is an ordered, first-in-first-out (FIFO) data structure. Typical implementations of queues support pushing elements to the back and popping them off the front position.
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Simulation: Find a waiting queue order that minimizes the total waiting time - Java
Intro
Suppose we are given a queue of waiting times \$\langle t_1, \ldots, t_n\rangle\$. The first "person" \$(t_1)\$ leaves the queue immediately. The persons \$(t_i), i > 1\$ all have ...
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Enhancing a non-multithreaded Circular buffer
Looking to get some feedback on a simple non-multithreaded circular buffer.
Ideally, I'd want to have a logic to prevent the data from getting overwritten but couldn't find a reasonable way.
For ...
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Synchonizing queue with mutex
I am trying to syncronize the queue between threads using mutex. I have 2 mil random integers in input.txt file. Main thread reads integers then puts them in queue. Other threads are simultaneously ...
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Queue-mergesort: a mergesort that does optimal number of comparisons in the worst case in Java
Here is the code for queue-mergesort by Mordecai J. Golin and Robert Sedgewick:
com.github.coderodde.util.QueueMergesort.java:
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Blocking Queue Class Unit Test
I would like any feedback on making the unit test for a BlockingQueue class more robust or better? improvements to the coding style, use of the ...
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ThreadSafe std::queue
I have written a threadsafe queue and I would like you to suggest what can be improved and how to write good unit tests for this implementation.
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Queue using doubly linked list
I have implemented my queue based on doubly linked list. The codes is tested and works, however, I am interested in some improvement ideas, thanks
Based on some review remarks on my previous ...
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Queue implemented using two stacks in Swift
I need your expert opinion! In fact, for a Leetcode Problem, I had to code a queue using 2 stacks. It's shown just below and functions well.
It is a pretty simple code with peek, pop, push, etc. ...
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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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(Rev. 2) Type-generic queue implementation using singly linked lists
Thanks to the extremely helpful comments and answers from the original post, I've improved the interface and implementation of this general-purpose queue library.
Improvements include:
Fixed memory ...
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Type-generic queue implementation using singly linked lists
Simple lightweight queue implementation using data size registration and singly linked lists as the underlying type
Update #2
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Queue Linked List based implementation in C++
I wrote my implementation to Queue Linked List based. And I need a review for it to improve it and improve my coding skill. I also will put this implementation on my GitHub account.
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Queue array based implementation in C++
I wrote my implementation to Queue array based. And I need a review for it to improve it and improve my coding skill. I also will put this implementation on my GitHub account.
Thanks in advance.
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Node.js batch processing
Batch processing steps:
When a job is posted, push it to the queue.
Get the required number of items from the queue and put it in the ...
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Queue-like class for managing stream data and metadata
The following class is used in an application to record internet radio streams*. These streams consist of big chunks of audio data with smaller chunks of metadata between them. By monitoring 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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Async FIFO processing of database writes - naive implementation in .Net 6
One of the companies I was recently interviewing with gave me a following task to implement in a day or two using .Net, just to see where my coding abilities are at:
Implement a Web API that gets ...
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daemon in a producer-consumer
The daemon program is associated with a message queue with a predefined key, to be blocked later when waiting for messages.
The two programs implement a producer-...
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C++14 Lock-free Multi-producer, Multi-Consumer Queue
Introduction
This is a follow-up to a previous question of mine, where I presented another queue of the same type to get some feedback on it. Some people pointed out some fundamental errors I had ...
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Lock-free multi-producer / multi-consumer queue in C++
I've been working on a lockless multi-producer, multi-consumer queue in an effort to learn as much as I can about concurrency, without the use of mutual exclusion. The queue uses a bounded ring buffer ...
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Type-agnostic abortion condition in Producer-Consumer model queue
This is a follow-up post to the topic discussed here.
Description
I am trying to implement a robust, multi-threaded producer-consumer model with a single producer in the main thread and several ...
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Optimize Leetcode 239. Sliding Window Maximum using Swift
LeetCode problem 239. Sliding Window Maximum
You are given an array of integers nums,
there is a sliding window of size k which ...
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Multi-producer/single-consumer queue in Python
I am currently working on a problem that involves multiple producers and a single consumer through a queue object. The following list is about a few things that's special about this problem:
One ...
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Merging and sorting queue/list implementation
My requirement is implementing a Queue<T> (where T is a Lexeme) that is capable of ...
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FIFO array/queue
I'm new to programming and was tasked with programming a generic circular FIFO queue, without using anything but an underlying array and self-programmed methods. I still don't know how to approach ...
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Thread-safe message queue
In my learning course, I've implemented a message queue to which data gets pushed by some thread and later gets processed by some other thread. My implementation isn't that efficient as it involves ...
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Randomized Queue with ArrayList from Princeton's Algorithm Book
In the book they recommend to utilize an Array, but I think that it's easier to use an ArrayList instead, is there any problem with that? Is this code well designed?
...
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Merging pages together into an append log
Situation
I'm scraping data from a paginated list on a website to be sent out as notifications.
For the most part we'll only need to scape the first page and handle additions, deletions and duplicates....
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Write deduplicated 9-digit numbers from concurrent clients to a log
Problem Statement:
Write a server (“Application”) in Java that opens a socket and restricts input to at most 5 concurrent clients. Clients will connect to the Application and write any number of 9 ...
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The multithreading model to clean ConcurrentQueue in C#
I have some code that populate EventfulConcurrentQueue which is ConcurrentQueue. So I need to save all data from ...
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Generic concurrent bounded buffer in C
I just implemented a generic concurrent queue in C, and I'd like some feedback on my implementation, as well as the logic in handling generic data and concurrency.
buffer.h
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Compute the outputs of a generator in parallel
I am processing an unknown "length" of generator object.
I have to keep things "lazy" because of memory management.
The processing is compute heavy, so writing it multiproc style ...
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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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dynamic queue implementation in C++
I've implemented a dynamic queue with a random-access iterator.
iterator:
...
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Generic Queue in C
I'm implementing a generic (ie. void *) queue in C. I believe I have a working version but I'm looking for two things:
Do any subtle bugs pop out to the ...
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FIFO queue for a 2D array in ANSI C, version 2
This is a modification of my previous version.
I would like advice on improving a FIFO algorithm for a 2D array that I've developed in ANSI C.
I have written code that uses this algorithm for test ...
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FIFO queue for a 2D array in ANSI C
I have a 2D array of fixed size and I've implemented a FIFO function. So, the array will always be full before it reaches the FIFO function, then the FIFO will remove the oldest array, move all of the ...
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Queue with O(1) enqueue and dequeue with JS arrays
If you simply implement it with .push() to .enqueue() and .shift() to ...
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Type agnostic, statically allocated, thread-safe queue in C
I need a queue in C for an embedded application in which I cannot allocate memory dynamically.
I avoided using void* for the queue elements (which is not convenient ...
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Basic queue design and implementation
In general, I'd love some comments on this basic queue using dynamic allocation.
In particular, I want comments about whether this queue is good in embedded systems, for example say a a sensor network ...
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A thread-safe blocking FIFO queue
A legacy project was upgraded from legacy code that used either SystemV FIFO device (or similar queue on Windows platform) which was deeply ingrained into every thread's implementation. Following ...
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C++ Queue Circular Array Implementation
I'm trying to implement a queue data structure in C++ using a circular array.
Please give recommendations on how I can improve this code.
Also, is my array growth strategy good? I'm doubling the array ...
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Double-ended queue for Embedded Systems with different data size
I decided to modify my last code about a queue intended for embedded systems and make it accept different data types for multiple purposes.
It is a double-ended queue, the user can store and get ...
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My queue implementation (in C) [V.2]
My previous implementation: My queue implementation (in C)
I rewrote the queue following @vnp's suggestions. Here is the second version of it:
Any suggestions or tips are appreciated :)
(even tips ...
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Double-ended queue for Embedded Systems
Following my previous question about a FIFO for embedded systems and the very detailed answer I got, I made some modifications to convert a simple FIFO to double-ended queue for Embedded Systems.
It ...
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My queue implementation (in C)
This is my queue implementtion in C. Feel free to ask me any questions relating to my code. Any tips or suggestions are welcome, including tips on naming/spacing/common conventions.
Queue_node, Queue, ...
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Multiple producer single consumer on the same thread
I implemented a multi-producer single consumer class, with an important restriction that once the consumer started working, it must continue its work on the same thread (the reasoning behind this is ...
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A concurrent lock-free Linked Queue implementation
Recently I've been learning about concurrency/parallelism and I decided to implement the Michael&Scott lock-free Linked queue (PDF) as practice.
I'm not entirely sure how to test this data ...
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Extract text file from zip, parse content and post to azure queue storage
Problem
I'm trying to create the most performant code to:
Extract a text file from a zip
parse its content
serialize class
post to Azure Queue Storage
Scenario
4 times per year I receive 20 zip ...
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