If we will google something like 'java thread state' we will see approximately this diagram: But if we will open jVisualVm we will see following: Can you help to meatch these diagrams? Sleeping state is just Thread.sleep()? Special case of the Runnin
I've searched for it and only found here and here, but it not solves my problem. How can I using a standard way identify the log separating the concurrent logs like JAVA does with thread ID?. Because if I have a concurrent method they logs will be pr
public class ThreadDemo implements Runnable { Integer ar [] = new Integer[100]; @Override public void run() { synchronized (ar) { System.out.println("Start: In run method"); for(int i =0; i<100;i++) { ar[i]=i; } for(int i=0;i<100; i++) { a
My task is to download 1M+ images from a given list of urls. What is the recommended way to do so? After having read Greenlet Vs. Threads I looked into gevent, but I fail to get it reliably to run. I played around with a test set of 100 urls and some
For educational purposes I'm writing a simple version of AtomicLong, where an internal variable is guarded by ReentrantReadWriteLock. Here is a simplified example: public class PlainSimpleAtomicLong { private long value; private final ReentrantReadWr
To best describe the question, i'll begin with the following scenario: Suppose i have a poker game: The player is allowed to use credit in order to purchase some goods. If the player executes two purchase orders at the same time (theoretically), two
I have a simple application in which I create 3 threads inside a class to ping 3 different websites and note the time taken to do so. I wish to enhance it by seeing which thread out of the 3 executes successfully first and terminating the other two .
I have two threads running, userInputThread waits for user input from the command line and interrupterThread tries to interrupt userInputThread 1 sec after starting. Obviously you cannot interrupt a thread that is blocked by the System.in. Another an
I've got class: ClassX.m @property (assign) BOOL wasProcessed; -(void) methodA { //<- this can be called many times in short period of time dispatch_async(dispatch_get_main_queue(), ^{ [self methodB]; }); } - (void) methodB { if (!self.wasProcessed)
I'm looking for a way to block until a BlockingQueue is empty. I know that, in a multithreaded environment, as long as there are producers putting items into the BlockingQueue, there can be situations in which the queue becomes empty and a few nanose
A few days ago i tried to create a server - client or client Server as an experiment to learn about socket using a thread but then someone told me that i should use swingWorker. I did some research how to use and have implemented it in as practice bu
EDIT: As result of the answers so far I like to add more focus in what I like to zero in on: A database that allows writing in-memory (could be simple C# code) with persistence to storage options in order to access the data from within R. Redis so fa
I've found that including a call to System.out.format in the classic Java Deadlock Tutorial will prevent deadlock from occurring, and I can't figure out why. The code below is the same as that of the tutorial, with the addition to main of System.out.
I'm using VHDL, but my simulator doesnt support the unaffected waveform in the following example code which I need to have running before I can begin the homework assignment. I read online I can pass the same waveform Z, but I'm not sure how to do th
According to ThreadLocal's javadoc, it sounds like its a thread-specific container for 1+ atomic fields. Is the purpose of ThreadLocal to represent all the atomic fields for a single Thread, or is it to just provided a convenience container when you
I think I just am not seeing something as I've gotten this to work in the past. My lock isn't holding an exclusive lock, and when a new instance of the object is created, tryLock returns true and another TimerTask is scheduled. public class A { priva
My thread pool has a fixed number of threads. These threads need to write and read from a shared list frequently. So, which data structure (it better be a List, must be monitor-free) in java.util.concurrent package is best in this case?had better be
As the topic suggests I have a server and some clients. The server accepts I/O connections concurrently (no queueing in socket connections) but I have this troubling issue and I do not know how to bypass it! If I force a client to throw an I/O Except
public class MainClass { private static final int producerPoolSize = 10; private static final int consumerPoolSize = 20; private ExecutorService prodExec = Executors.newFixedThreadPool(producerPoolSize); private ExecutorService consExec = Executors.n
The producer is finite, as should be the consumer. The problem is when to stop, not how to run. Communication can happen over any type of BlockingQueue. Can't rely on poisoning the queue(PriorityBlockingQueue) Can't rely on locking the queue(Synchron
Does anyone know what the memory and threading models are in nodejs? In particular, is ii++ atomic? Does it behave as if ii were volatile in Java 1.5, in Java 1.4, in C, or not at all?It is useful to understand how node and V8 interact. Node handles
I come from a C# background and I have a bit of a tough time with concurrency in C. I am not going to lie to you... This is part of a project I have to do for school. Although professionally I have worked with high level languages, my senior thesis p
What are some methods for testing concurrent data structures to make sure the data structs behave correctly when accessed from multiple threads ?All of the other answers have focused on actually testing the code by putting it through its paces and ac
I am building a web app in Silverlight which allows users to view and edit a database. In order to prevent multiple users from editing the same data, I was thinking of implementing a lock and key mechanism, so that other users are made to wait when o
I'm creating a simple online shop with PHP integrated with PayPal that sells unique items. What I'm wondering is how other shops deal with multiple people attempting to go through the payment process with the same item. This is my current draft strat
Assume that we have Spring bean UserController with singleton scope. All my further reasoning is based on my assumption that "singleton" scope is almost similar to application scope i.e. we have only one instance for all users. If this is wrong
Imagine a heavily-used service object that's implemented as an EJB 2.1 SLSB, and that also happens to be thread-safe in itself by virtue of having no state whatsoever. All its public methods are transactional (via CMT), most simply requiring a transa
I've done a bit of reading related to the concurrency issues with sqlite, but I don't see how they'd apply to Django since it's inherently single threaded. I'm not using any multiprocess modules either. I have absolutely no experience with concurrent
I'm looking into educating our team on concurrency. What are the most common pitfalls developers fall into surrounding concurrency. For instance, in .Net the keyword static opens the door to a lot of concurrency issues. Are there other design pattern
I wrote a couple of Java classes-SingleThreadedCompute and MultithreadedCompute-to demonstrate the fact (or what I always thought was a fact!) that if you parallelize a compute-centric (no I/O) task on a single core machine, you don't get a speedup.
