Recent questions tagged Concurrency

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concurrency - Synchronizing on an object in java, then changing the value of the synchronized-on variable

I came across a code like this synchronized(obj) { obj = new Object(); } Something does not feel right about ... it, please point it out. Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - Understanding goroutines

I'm trying to understand concurrency in Go. In particular, I wrote this thread-unsafe program: package main ... purpose for this toy example. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - Instructions reordering in Java JVM

I was reading this blogpost. And the author was talking about breaking the hashCode() in String in multithread ... of registers being used. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - Optimistic Locking by concrete (Java) example

I have spent my morning reading all the top articles that Google churns up on optimistic locking, and for the ... explanation of why it works. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - How to properly create and run concurrent tasks using python's asyncio module?

I am trying to properly understand and implement two concurrently running Task objects using Python 3's relatively ... to juggle multiple tasks? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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369 views

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concurrency - What are the use cases of scala.concurrent.Promise?

I am reading SIP-14 and the concept of Future makes perfect sense and easy to understand. But have two ... what makes a Promise necessary? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - Are POSIX' read() and write() system calls atomic?

I am trying to implement a database index based on the data structure (Blink tree) and algorithms suggested by ... my own locking mechanism? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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626 views

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concurrency - Are C# structs thread safe?

Is a C# struct thread-safe? For example if there is a: struct Data { int _number; public int Number { ... property named TheData, thread-safe? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - Nested Java 8 parallel forEach loop perform poor. Is this behavior expected?

Note: I already addressed this problem in another SO post - Using a semaphore inside a nested Java 8 parallel ... been fixed in Java8 u40. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - Lock-Free Concurrent Linked List in Java

I would like to use a Linked List like the one described in this paper. However, I didn't find any ... ) Linked List implementation in Java? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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473 views

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concurrency - anonymous struct and empty struct

http://play.golang.org/p/vhaKi5uVmm package main import "fmt" var battle = make(chan string) func warrior(name string, ... do I need to do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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376 views

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concurrency - Can Scala actors process multiple messages simultaneously?

The reply to a recent question of mine indicated that an actor processed its messages one at a time. Is ... question #2 which I need answering See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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416 views

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concurrency - scala.concurrent.blocking - what does it actually do?

I have spent a while learning the topic of Scala execution contexts, underlying threading models and concurrency. ... easily betray its secrets. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - Why does the use of an unbuffered channel in the same goroutine result in a deadlock?

I'm sure that there is a simple explanation to this trivial situation, but I'm new to the go concurrency ... the deadlock and fix the code. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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500 views

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concurrency - How do goroutines work? (or: goroutines and OS threads relation)

How can other goroutines keep executing whilst invoking a syscall? (when using GOMAXPROCS=1) As far as I' ... of thread creation and management. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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773 views

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concurrency - What exactly does runtime.Gosched do?

In a version prior to the release of go 1.5 of the Tour of Go website, there's a piece of code ... does runtime.Gosched() affect the execution? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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488 views

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concurrency - Why does this Java program terminate despite that apparently it shouldn't (and didn't)?

A sensitive operation in my lab today went completely wrong. An actuator on an electron microscope went over its boundary ... 6 on 64-bit Linux. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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780 views

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concurrency - Whether to use invokeAll or submit - java Executor service

I have a scenario where I have to execute 5 thread asynchronously for the same callable. As far as I understand, ... compared to the other one? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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630 views

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concurrency - Java: is there no AtomicFloat or AtomicDouble?

I have found AtomicInteger, AtomicLong, but where is AtomicFloat (or AtomicDouble)? Maybe there is some trick? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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529 views

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concurrency - Java: ExecutorService that blocks on submission after a certain queue size

I am trying to code a solution in which a single thread produces I/O-intensive tasks that can be performed ... through all answers and comments. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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419 views

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concurrency - What's the status of multicore programming in Haskell?

What's the status of multicore programming in Haskell? What projects, tools, and libraries are available now? What ... reports have there been? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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614 views

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concurrency - Can an asyncio event loop run in the background without suspending the Python interpreter?

The documentation for asyncio gives two examples for how to print "Hello World" every two seconds: https:// ... commands at the interpreter? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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595 views

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concurrency - How do I atomically increment a variable in Swift?

I want to be able to increment a counter atomically and I can't find any reference on how to do it. Adding more ... += 1 mux.unlock() } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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481 views

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concurrency - Java ReentrantReadWriteLocks - how to safely acquire write lock?

I am using in my code at the moment a ReentrantReadWriteLock to synchronize access over a tree-like structure. ... approach does not work. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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496 views

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concurrency - When do I need to use AtomicBoolean in Java?

How I can use AtomicBoolean and what is that class for? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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812 views

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concurrency - What is a memory fence?

What is meant by using an explicit memory fence? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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470 views

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concurrency - What is a coroutine?

What is a coroutine? How are they related to concurrency? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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424 views

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concurrency - How does LMAX's disruptor pattern work?

I am trying to understand the disruptor pattern. I have watched the InfoQ video and tried to read their ... pointers to a better explanation? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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