Concurrency is a property of systems in which several processes are executing at the same time.
Concurrency is a property of systems in which several processes are executing at the same time.
Questions tagged [concurrency]
374 questions
47
votes
5 answers
How does a movie theater seat booking system prevent multiple users from reserving the same seats?
In the movie theatre I go to they have ticket kiosks that allow you to select the seats you want; they also have a website that does the same (the website also has a countdown timer of like 30 secs in which you must choose a seat).
While I…
mbwasi
- 581
17
votes
7 answers
Why should I know concurrent programming?
Concurrent programming is quite difficult to me: even looking at a basic slide seems challenging to me. It seems so abstract.
What are the benefits to knowing Concurrent programming concepts well? Will it help me in regular, sequential programming?…
Caffeinated
- 656
13
votes
2 answers
Is The Free Lunch Over?
In his famous The Free Lunch Is Over article from 2005, Herb Sutter predicted a Concurrent Programming Revolution as big as Object-Oriented Revolution. Has this revolution really happend in years 2005 - 2013?
Key points in the article:
Processor…
cpp
- 281
5
votes
2 answers
Selective mutual exclusion in Dining Philosophers and Readers and Writers problem
I've been reading about selective mutual exclusion (SME). The idea I got is that if a process competes for its resources against a subset of all the other process instead of competing with all the other processes then I'm facing a SME problem.
1)…
Mosty Mostacho
- 279
4
votes
3 answers
What are the usual difficulties in concurrent programming and tuning of concurrent programs (shared-memory model)?
I can list part of the problems that will show up when writing a moderately-sized concurrent application with shared memory:
Locking granularity
Choice of synchronization primitive
Number of threads
Method for decomposing into threads (data…
Jay
- 141
3
votes
1 answer
Structured concurrency and GUI applications
Intro
Structured concurrency is a relatively recent concept for structuring concurrent programs. It has implementations in for example Python, Java and Swift.
Examples of structured concurrency often describe a server application which has to…
Lii
- 471
- 4
- 7
2
votes
1 answer
What is the difference between local and non-local concurrency?
I was reading the Wikipedia article on Actor model and came across this line-
...bridging the chasm between local and nonlocal concurrency.
What is this "non-local" concurrency and how is it different from "local" concurrency?
Gulshan
- 9,442
1
vote
3 answers
Possible concurrency issues with database read/writes
For context, I am building an application with a server that is written in python, hosted on AWS, and uses DynamoDB for a database.
My question pertains to the following operation: When a user purchases an item, I want to update the count of…
ashissl
- 19
1
vote
2 answers
Approaches to dynamically determining if concurrency needed
There is a series of procedures, each of which falls into one of two general categories.
Most of these are of category 1: it would be best to execute them one at a time - the overhead associated with threading or even using a thread pool negates any…
Aaron Thomas
- 119
- 5
0
votes
1 answer
Wrap REST API with a Lock to Support concurrent requests in a cluster environment
We are dealing with a third party API that doesn't handle concurrency, and we don't have access to the database directly. Our client application is deployed in a cluster environment and has multiple worker nodes sending update requests to this API.…
Downhillski
- 111