Multi-threading is how work performed by a computer can be divided into multiple concurrent streams of execution (generally referred to as threads).
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22 views
Multi Producer - Single Consumer
I have written multi producer single consumer code with bounded buffer. Please review the code for any improvements or mistakes.
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12 views
Parallel Sum Scan using CUDA
I'm learning CUDA (and C to some extent), and one of the algorithms that I am learning is the Hillis-Steele scan algorithm. I wrote a program that performs a simple scan with adding.
I don't really ...
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1answer
45 views
Reuseable C++11 Thread
I'm learning about threading support in C++. I've got a basic understanding of thread-pools and why creating and destroying threads on some systems can be expensive. As far as I'm aware C++11 doesn't ...
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2answers
138 views
Thread synchronization wait/notify
I need to run several identical threads. All threads must wait to do their job, until all threads are running (alive).
I use wait/notify to synchronize: when a thread is created it waits until it ...
4
votes
2answers
91 views
Multi threaded text-based tetris game
I have decided to make a game of text-based Tetris in C.
At first I had no idea how to start so I settled for threads.
Each thread moves its own piece down the grid and all the main thread does is ...
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0answers
45 views
Find the possible mathematic expressions from the given integers to evaluate a value
How can I decompose this code into multiple threads so that it can run in parallel and enhance the efficiency (speed)?
Can anyone suggest how I can use OpenMP here and where I can apply an OpenMP ...
2
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2answers
144 views
How do I write my multithreading code correctly so that it is faster than a single thread?
I have the following code that I am trying to optimize. I am running it on a Linux machine with 24 cores. I thought I could use multithreading to make it faster, but it's somehow making it way slower ...
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1answer
50 views
Multithreaded Producer-Consumer pattern
I have Producer Threads A, B and C producing 3 different types of events Events A, B and C respectively. The Consumer thread can ...
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3answers
122 views
Producer/consumer problem with four priority levels
Here you can see a mediocre code of mine where I have fun with four deques, each with a different priority.
Here is how it works: in a ...
7
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1answer
96 views
Project hotel reservation in Python with OOP and multithreading
I have to create a project in Python 3 for a university exam. The project involves the use of object-oriented programming and the use of multithreading. My project is based on the simulation of ...
4
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3answers
120 views
3
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1answer
40 views
Run multiple prerequisite methods in parallel before continuing
I have an application in which I have multiple slow running prerequisite methods I need to call in order to have the data I need to continue.
To try to speed this up I am doing this:
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3
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2answers
121 views
Counting multiples of 3 or 5 using threads
I have a modified version of the first Project Euler problem — where I find the sum of all the numbers below the value 2100000000 that are multiples of 3 or 5 using a multi-threaded program.
The ...
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0answers
25 views
Run a potentially long running application from within a Python webserver and return different results depending on whether the application finishes
I want an API on a Flask/Gunicorn webserver to make a call to a separate, potentially long-running java application. If the java application finishes before the Gunicorn timeout, Flask should return ...
3
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1answer
50 views
Mandelbrot image generator with parallel iteration
I'm currently trying to optimize this class I have for fractal generation. The equation is meant to be pluggable; I have used z => z*z + c so that it's not using ...
5
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0answers
30 views
Multiple rusty Sieves of Eratosthenes
To get more familiar with the multi-threading aspects in the Rust language I decided to multi-thread my earlier implementation of The rusty Sieve of Eratosthenes.
I have to say that it is probably in ...
3
votes
1answer
63 views
Simulating memcache get and set race condition and solving it with add
Memcache get and set can hit a race condition if you use them together to achieve something like locking because it is not ...
5
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1answer
157 views
Simple Background Thread Worker Class (follow-up)
This is a follow up of Simple, generic background thread worker class
What changed?
Moved from synchronized lazily evaluated static instances to true Singletons per the on-demand holder idiom https:...
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1answer
83 views
Skeleton of a Multi-threaded web crawler in Java
I am trying to prototype a simple structure for a Web crawler in Java. Until now the prototype is just trying to do the below:
Initialize a Queue with list of starting URLs
Take out a URL from Queue ...
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2answers
81 views
Thread synchronization with mutex
This program prints odd numbers by thread1 and even numbers by thread2 sequentially. Can this code be optimized or made more ...
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1answer
24 views
Capture some state in Haskell
I want to capture some state in a Haskell function. For instance, I have many thread trying to print on the console and I want the to play nice with each other. So I want to have some XX to make the ...
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0answers
51 views
Parallel integer tree sort algorithm in Java
Introduction
In this post, I will present a parallel sorting algorithm for sorting primitive integer arrays.
Treesort
Treesort is an algorithm which iterates over the input array and constructs a ...
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3answers
88 views
C++11 Blocking Queue learning exercise
As part of my own C++11 learning exercise I have implemented this Blocking Queue using the new C++11 thread API. One of the aspects I would like to improve is efficiency i.e. in the ...
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1answer
64 views
Improving GUI update call from a worker thread in winforms
I have a winforms app and I've been using the following approach to update controls on the main form from worker threads:
GamepadManager class has:
...
1
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4answers
363 views
Reading HTML files, removing HTML tags, and writing content and summary to a file
Write a multithreaded C++ application (executable) for Windows
Platform. This program uses the two threads to read and process the
input data and store it into an output file. Candidate is free to ...
3
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3answers
521 views
Finding the tree height in Python
I'm trying to get an efficient algorithm to calculate the height of a tree in Python for large datasets. The code I have works for small datasets, but takes a long time for really large ones (100,000 ...
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0answers
43 views
Block a partcular machine for a particular period of time interval after x failure
This is an extension to this question
I am working on a library which makes Http call to my service. I have below two requirements:
If my service machine doesn't respond back (there is a socket ...
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2answers
126 views
Dynamic Multi-threading lock with while loop
I have already asked a question about a dynamic multi threaded lock, and the reviewer found a problem.
Here is the description of the problem that I need to solve:
I need to create a structure ...
3
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1answer
79 views
Dynamic Multithreading lock
I need to create an structure to control dynamically locks. For example, I have 100 threads running, and each thread will "process" a "key". Sometimes two threads could be processing the same "key", ...
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1answer
65 views
Custom countdown timer class to replace the Android CountdownTimer
This project was made to replace the stock Android CountdownTimer class. It is more responsive when completing the timer and adds additional functionality such as ...
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2answers
362 views
Android splash screen
I have implemented a splash screen, to hold/pause the screen for few seconds and then launch the next screen. I am very enthusiastic to know if there is a more basic way to write the code.
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0answers
34 views
Livelock simulation
I want to understand how Livelocks happen and also how to translate my thought in to working code. I have written the following snippet to simulate a livelock between two persons passing each other in ...
10
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1answer
340 views
Efficiently using Apache HttpClient in multithreaded environment
I have a library which is being used by customers and they are passing DataRequest object which has userid, various ...
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0answers
37 views
Automatic resource allocation for the purpose of resource-dependent task scheduling
Here is what I'm trying to accomplish: Suppose you are trying to control an embedded system with several external hardware resources/components/devices. Naturally, you are concerned with the issue of ...
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2answers
74 views
Small C++ thread pool
I've made a small thread pool that i'll be using to communicate with a Redis server:
...
2
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0answers
19 views
Using RemoteChannels for an parallel iterable map
RemoteChannels hit with julia v0.5
There are no examples online, but I managed to get them to work.
They are still very new, and all this whole area of multithreading code continues to have running ...
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0answers
28 views
Loading sub items of TreeView in background
I am working with a TreeView (default control from .Net Framework) that displays hierachical data. Data are bound to the view using MVVM pattern with the ...
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0answers
37 views
Methods to add and check elements in a Bloom Filter
I have a working Java implementation of Bloom Filter.
These are the methods to addElement and check for an element.
...
2
votes
1answer
128 views
Portable periodic/one-shot timer thread - follow-up
This is a much improved version (I hope) of code in this previous code review of mine.
I have:
renamed several things. Are the names good?
made it lazily start the worker thread only after the ...
3
votes
1answer
67 views
Reader-writers problem using semaphores in Java
I have written my own solution to the Reader-Writers problems using semaphores based on the psuedocode from Wikipedia. I would like to gauge the correctness and quality of the code.
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3
votes
2answers
49 views
Thread Safe Servlet
I am working on a JSP MVC web application. I am confused about Thread-Safe Servlet concept. Following is my code, please tell me is it thread safe or not. Also, tell me the reason that why it is ...
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0answers
40 views
Multithreaded client socket
This is my first time working with networks and multithreading in C, and would like to know how to make improvements.
I wanted to make a client program that handles reading and writing to the server ...
4
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1answer
56 views
Multiple Persons enter room simultaneously and exits after specific interval of time
Here is the link to git repo of my application I am currently implementing just to have better understanding of OOP as well as learning Concurrency (Atleast a try :D)
What is the whole ...
2
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1answer
414 views
Thread class for exercises
I just felt a sting as for the first time, I copy-pasted code blocks, and made very little change to it, to overload it. It works fine, but I have 3 constructors that are basically copy-pasted. I'm ...
4
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2answers
134 views
Threadpool implementation in C++11
I am implementing a very primitive threadpool with C++11 using mutex and conditional variable. The class ...
2
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2answers
65 views
Creating a ticker thread - version 2
In this question, I asked for feedback on a class that provided my program with periodical signals.
I have rewritten that class based on the feedback from the accepted answer. As this again uses a ...
3
votes
1answer
153 views
Java Multitasking (String concatenation)
I would like to know if I did everything right and if there a way to do it more simple?
Task:
Task link to html file
My main:
...
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votes
1answer
78 views
Multithreaded AES encryption [closed]
I am trying to implement Lowering speed on my hybride encryption function for large files but can't seems to successfully bug fix a few issues.
How do I deal with the while loop in this ...
6
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1answer
51 views
Producer Consumer in C
I'm doing multithreading at university and we've been asked to implement the producer consumer problem in C.
My code compiles and produces the right result. From debugging it, it seems to be waiting ...
5
votes
0answers
47 views
Delete engine for deeply nested linked structure
The background is the question at http://stackoverflow.com/questions/36634394/nested-shared-ptr-destruction-causes-stack-overflow. To summarize, for a data structure that looks like:
...