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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Queue Using Stack java implementation

Implemented this solution for the problem. Feedback and review if this can be improved in an way. Appreciate your help. ...
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C++ fixed-size queue full/empty signaling

I'm considering an application where a large data needs to be written to file often. I would like to use a queue and have a producer and consumer running on different threads. Additionally, I would ...
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Queue resizing array implementation

After learning about linked list implementations of a queue I was asked to try a resizing array implementation. I'm looking for constructive criticism. ...
3
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40 views

Queue implementation using two stacks

Here's my code and I want to know if there's a better method for doing so. While the question has stated two stacks I wonder if we could do only with one as well? ...
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3answers
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Array-based queue implementation using C

I wrote this header for generic use of a queue. The one thing I'm wondering is if I understood the usage of void*. I hope that if somebody teach me some conventions ...
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1answer
53 views

Pipeline with std::thread vectors and queue

here is my code, it works but after few iterations it slows down and stop without any error, I'm looking for a more efficient solution. ...
4
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1answer
88 views

Implementing Binary Tree using Queue in C#

I am in the process of learning data structures and I am trying to implement Binary Tree using Queue in C#. Below are my Tree implementation classes. ...
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1answer
66 views

My Queue implementation is correct?

I have read CLRS Introduction to Algorithms book, now I'm on Elementary data structure chapter. I read about queue concept and try to implement in c. I have tested a lot it work fine, but I have a ...
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2answers
75 views

Stack and Queue implemented with a LinkedList

I am looking for feedback on my implementations of Queue, Stack, and LinkedList using Java ...
3
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1answer
97 views

MazeRunner in Java - follow-up

I've refined a lot of the code from my previous question, and have also decided to include the logic that interprets a given text file. Any advice on how to improve the actual algorithm that solves ...
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1answer
75 views

MazeRunner in Java

To test the queue I perfected from one of my CR questions, I've developed a maze program that receives an input maze, starting and end positions, and solves it. I have separate software that handles ...
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52 views

Web scraper using Beautiful Soup

I am using Python 3 with Beautiful Soup to scrape web sites. I also used Thread to download images, but it will spend more than 30 minutes to get all information ...
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0answers
65 views

Blocking Memory Queue

This is a FIFO blocking memory queue in F# to be used as a component in a logging library. ...
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1answer
39 views

Multi-layer queue

I must write code for my classes which simulates multi-layers production line. But I don't even know how to check if it's good. Can anyone take a look at my code, please? First machine works in random ...
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2answers
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DoublingQueue in Java

Inspired by this CR question, I decided to create my own queue! If you guys see anything taboo or have any improvements, please let me know. Ultimately I want it to be feature rich and bug free, with ...
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5answers
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FiniteArrayQueue type with interface and unit tests

Doing some exercises on basic data structures, I learned about queues, and decided to roll my own to better understand how a basic queue can function. As the name indicates, this Queue is made from a ...
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1answer
42 views

Implement MyQueue using two stacks

I am taking a helper stack, which is used during dequeue. Kindly suggest improvement or some solution with less complexity. ...
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2answers
99 views

Array-based deque in Java

Are the conditions which I have included for insertion and deletion from front and rear sufficient and necessary? Have I missed some condition check? Or have I included some redundant condition? <...
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3answers
91 views

Lock-free SPMC queue

Here is my lock-free queue implementation for single producer with some preallocated memory. T is a simple type with no need for move operations. I don't use ...
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0answers
78 views

Immutable queue implementation in Scala

I created a queue in which we can perform Enqueue, Dequeue and Traversing in Scala. ...
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1answer
34 views

Converting Binary Tree to LinkedLists

The problem statement is : Given a binary tree, design an algorithm which creates a linked list of all the nodes at each depth (e.g., if you have a tree with depth D, you'll have D linked ...
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3answers
938 views

Animal shelter simulation using Queues

This is of one the interesting problems I've solved: An animal shelter holds only dogs and cats, and operates on a strictly "first in, first out" basis. People must adopt either the "oldest" (...
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0answers
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Are there pitfalls to this solution to read messages from a queue in parallel?

I've posted a question on stackoverflow: How can I consequently read messages from a queue in parallel? I would like my own answer to be reviewed. Situation We have one message queue. We would like ...
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Updatable priority queue

This is an updatable priority queue. In contains an index (implemented as std::unordered_map) which maps a value to its position in the queue itself. The queue is ...
6
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1answer
66 views

Queue implementation in Java

This is my Queue implementation in Java. Would appreciate a review of the code. ...
6
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1answer
162 views

Priorizatable command queue

This code consistently executes commands with a given priority. How can I to improve it? ...
4
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3answers
112 views

Implementing CircularQueue using Linked List in C++

I'm currently doing a project, requiring me to implement a CircularQueue data structure in C++: ...
4
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2answers
832 views

Simple FIFO and LIFO ferry simulator

I am trying to make a ferry simulator with one ferry that works like a stack and another like a queue. I have a working class for stacks and queues with pop/push; I am trying to figure out how to ...
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2answers
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LinkedList Queue implementation

I'm working on a project which simulates (very simple/watered down) a network. The basis of this is to learn how to implement a Queue. I understand there are many ...
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1answer
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MPMC lock-free queue

I'm pretty new to the world of lock-free programming and would love some feedback on this code. I have been testing the queue with multiple producers and consumers, and with no unexpected output (yet)....
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2answers
137 views

Stack using two queues

I have implemented the Stack using two Queues q1 and q2 respectively as shown below in the code. I would like to get you reviews on whether it's an efficient way of implementing it or now. For Pop ...
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243 views

Queue implementation using arrays

Please review the code: ...
4
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3answers
138 views

Lock-free MultiConsumer/MultiProducer queue

I've written a simple lock-free multi-consumer/-producer FIFO queue. It's supposed to work like this: At any time many consumers may read from it At any time multiple producers can write to it, ...
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2answers
75 views

Lockless SCSP queue

I'm looking for a code review on a class that I've written. It was my first attempt at lockless programming and I'd love any feedback I can get. ...
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2answers
305 views

Thread-safe lock free FIFO queue

A few years ago there was a need to add a FIFO queue between 2 threads into my project. At that time I've got some interesting idea how to do that without any atomics and locks. (There was a ...
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2answers
120 views

Simple Implementation of a BlockingQueue

An implementation of BlockingQueue ...
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5answers
425 views

RingQueue implementation using std::array

I've recently finished implementing a ring queue based on std::array in C++11. I tried to write the code as if I were going to submit it to the C++ Standard ...
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1answer
87 views

Verify FIFO dequeue algorithm

I have a FIFO queue of packets, which maintains: Push index Pop index Count I would like to assert my dequeuing algorithm: ...
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4answers
701 views

Implementation of C linked list (Queue) of C strings on mega AVR

I have been working on a mechanism to queue up strings coming into a system via a USART and have implemented it as a singly linked list. I have done my best to profile the code and its memory usage at ...
4
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1answer
66 views

Serializable Queue header only library

I was hoping someone could check the library I 'm working on to see if they could give any suggestions. My biggest issue right now is getting tuple to work with more than just the basic types and I ...
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1answer
229 views

Priority blocking queue implementation

This is a follow on question from one I asked a few days ago here: Single process blocking queue Using the comments I determined that there probably isn't a pre-built solution for this and so I have ...
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1answer
957 views

Calculate the running median

I'm trying to solve a challenge where you need to calculate the median every time you add a number. say you have a list of numbers: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ...
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1answer
331 views

Making a copy constructor more flexible for ADT queue

I have constructed a copy constructor for an ADT queue. The copy constructor works fine. I would want to improve my code, but I don't really know how to shorten it to make it more flexible. ...
6
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1answer
158 views

Lock-free, multiple consumer, multiple producer queue

I'm implementing a lock-free, multiple consumer, multiple producer FIFO queue/pipe as an exercise in thinking about atomicity in operations. My main concern is correctness of operation, my second ...
4
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1answer
872 views

Lockless multi user, multi consumer FIFO queue using C++11

One of the features that is missing from C++11 are lockless queues. Therefore I have decided to write one myself. A few remarks: I know the code isn't technically lockless. However the lock is only ...
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1answer
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MailQueue - follow up

Follow up of this question. Things altered: Put logging (debug level) for creating and starting thread. A separate thread for starting the different threads. Locking object and synchronise for ...
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2answers
171 views

MailQueue implementation with auto start - stop

Previous question was a little portion of the mailQueue. I finished the MailQueue, which has the ability to start and stop ...
6
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2answers
185 views

Templated queue implementation

I wrote an implementation for a simple queue in C++ (for practice, since there's an stl queue). I've been trying to focus on memory management and the rule of three. Any suggestions/improvements? (...
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2answers
364 views

ConcurrentLinkedQueue to unmodifiable list

I have a ConcurrentLinkedQueue where I put some mails in. Now I have a visual page where I want to see what's in the Queue, but ...