threadpool

I've just started looking at Java's Executors class and the newCachedThreadPool( ) method. According to the API, the resulting thread pool reuses existing Thread objects for new tasks. I'm a bit puzzled how this is implemented because I couldn't find any method in the Thread API that lets you set the behaviour of an existing Thread object. For example, you can create a new Thread from a Runnable object, which makes the Thread call the Runnable 's run( ) method. However, there is no setter method in the Thread API that takes a Runnable as an argument. I'd appreciate any pointers. Executors does

When creating an FixedThreadPool Executor object in Java you need to pass an argument describing the number of threads that the Executor can execute concurrently. I'm building a service class that's responsibility is to process a large collections of phone numbers. For each phone number I need to execute web service (that's my bottleneck) and then save response in a hashmap. To make this bottleneck less harmful to the performance of my service I've decided to create Worker class which fetches unprocessed elements and processes them. Worker class implements Runnable interface and I run Workers

When I write the below code, why do I get avaliable Thread number like 1022, 1020. I have to get 25 thread max as I am using thread pool. I guess the ouput thread number is the avaliable threads on the system. I need to get the avaliable thread number in my thread pool, in win form application. private void Foo() { int intAvailableThreads, intAvailableIoAsynThreds; // ask the number of avaialbe threads on the pool, //we really only care about the first parameter. ThreadPool.GetAvailableThreads(out intAvailableThreads, out intAvailableIoAsynThreds); // build a message to log string strMessage =

一、并发 Unable to create new native thread …… 问题1：Java中创建一个线程消耗多少内存？ 每个线程有独自的栈内存，共享堆内存 问题2：一台机器可以创建多少线程？ CPU，内存，操作系统，JVM，应用服务器 我们编写一段示例代码，来验证下线程池与非线程池的区别： //线程池和非线程池的区别 public class ThreadPool { public static int times = 100;//100,1000,10000 public static ArrayBlockingQueue arrayWorkQueue = new ArrayBlockingQueue(1000); public static ExecutorService threadPool = new ThreadPoolExecutor(5, //corePoolSize线程池中核心线程数 10, 60, TimeUnit.SECONDS, arrayWorkQueue, new ThreadPoolExecutor.DiscardOldestPolicy() ); public static void useThreadPool() { Long start = System.currentTimeMillis(); for (int i = 0; i <

When does InvalidAsynchronousStateException get thrown? I have the following piece of code: control.InvokeRequired ? control.Invoke(expression) : expression(); In some random cases I get InvalidAsynchronousStateException and my application hangs, after doing some reading it seems to be that this exception will be thrown when the thread where the control was created finished. Is this correct? If so, this doesn't seem to be the case, unless something is making my application crash and this exception is just a consequence? is this possible? System.ComponentModel.InvalidAsynchronousStateException:

I am trying to find a way to log useful context from a bunch of threads. The problem is that a lot of code is dealt with on Events that are arriving via threadpool threads (as far as I can tell) so their names are not in relation to any context. The problem can be demonstrated with the following code: class Program { private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType); static void Main(string[] args) { new Thread(TestThis).Start("ThreadA"); new Thread(TestThis).Start("ThreadB"); Console.ReadLine(); } private

I would like to create a thread pool which will execute the most recently submitted task. Any advice on how to accomplish this? Thank you andersoj You could probably just implement your own BlockingQueue wrapper that maps offer/poll to a stack. Then use this as the BlockingQueue implementation you pass to a ThreadPoolExecutor . My suggestion would be to wrap one of the existing Deque implementations such as ArrayDeque . This is not synchronized, so you'll need to wrap each of the BlockingQueue methods with a synchronizer (if not something more exotic). You'll also need to introduce wait /