How to work with simultaneous logs at golang?

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

synchronize on the board does not show the expected result

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

Downloading images with gevent

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

Protect the initialization of a non-volatile field with a lock?

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

Parallel and end execution of multiple threads

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 .

Objective-C competition handling

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)

How to block until a BlockingQueue is empty?

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

How can System.out.format prevent blocking?

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.

New in VHDL, the unaffected waveform is not supported

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

Using ThreadLocal vs Atomic

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

ReentrantLock.tryLock () not lockable

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

Choose the best list of competitors in Java

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

Producer-consumer problem with a twist

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

Competition Models in nodejs

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

Change the global variable of the child process on Linux

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

Simultaneous data structure test

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

Preventing Simultaneous Editing of Data in a Web Application

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

Thread safety in JSF

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

Django and Sqlite competition problem

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

What are the common competition pitfalls?

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

Unexpected multithreaded result

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.