concurrency Archives - Page 4 of 5

How to wait for all threads to finish, using ExecutorService?

I need to execute some amount of tasks 4 at a time, something like this: ExecutorService taskExecutor = Executors.newFixedThreadPool(4); while(...) { taskExecutor.execute(new MyTask()); ...

May 6, 2022
0 Comments

Custom thread pool in Java 8 parallel stream

Is it possible to specify a custom thread pool for Java 8 parallel stream? I can not find it anywhere. Imagine that I ...

May 5, 2022
0 Comments

NSOperation vs Grand Central Dispatch

I’m learning about concurrent programming for iOS. So far I’ve read about NSOperation/NSOperationQueue and GCD. What are the reasons for using NSOperationQueue over ...

May 4, 2022
0 Comments

What is the difference between lock, mutex and semaphore?

I’ve heard these words related to concurrent programming, but what’s the difference between lock, mutex and semaphore? 10 s 10 A lock allows ...

May 1, 2022
0 Comments

What’s the difference between ConcurrentHashMap and Collections.synchronizedMap(Map)?

I have a Map which is to be modified by several threads concurrently. There seem to be three different synchronized Map implementations in ...

April 29, 2022
0 Comments

Why there is no ConcurrentHashSet against ConcurrentHashMap

HashSet is based on HashMap. If we look at HashSet<E> implementation, everything is been managed under HashMap<E,Object>. <E> is used as a key ...

April 28, 2022
0 Comments

Is JavaScript guaranteed to be single-threaded?

JavaScript is known to be single-threaded in all modern browser implementations, but is that specified in any standard or is it just by ...

April 28, 2022
0 Comments

What is a mutex?

A mutex is a programming concept that is frequently used to solve multi-threading problems. My question to the community: What is a mutex ...

April 20, 2022
0 Comments

When and how should I use a ThreadLocal variable?

When should I use a ThreadLocal variable? How is it used? 26 s 26 One possible (and common) use is when you have ...

April 17, 2022
0 Comments

Collection was modified; enumeration operation may not execute

I can’t get to the bottom of this error, because when the debugger is attached, it does not seem to occur. Collection was ...

April 15, 2022
0 Comments