threadpool

问题 I found a good implementation of boost based thread pool which is an improvement over this and this . it is very easy to understand and test. It looks like this: #include <boost/thread/thread.hpp> #include <boost/asio.hpp> // the actual thread pool struct ThreadPool { ThreadPool(std::size_t); template<class F> void enqueue(F f); ~ThreadPool(); // the io_service we are wrapping boost::asio::io_service io_service; // dont let io_service stop boost::shared_ptr<boost::asio::io_service::work> work

问题 We are using Future with a timeout to accomplish a task. We get a TimeOutException when time limit exceeds. From the behavior of thread dump , I realize that underlying thread continues. Is it the case? How does it take care of multiple threads roaming around? What if no IOException is thrown for the thread which was removed from the pool? If this is true, what is the way to kill underlying thread. It keeps on waiting for an external IO in my case. A part of thread dump: Thread 29587: (state

问题 I have a WPF MVVM app under NET 3.5 and Visual Studio 2008. Some controls in the view are bound to properties on the view model, so when these properties changes it will be notified to the view through the implementation of INotifyPropertyChanged. I have some kind of splash saying "Loading..." that appears in the center of the window at the beginning, and it keeps visible while some data is being requested from database. Once data is requested from database, I want to hide this splash. This

问题 I'm planning to use Netty to design a TCP Server. When the client connects, I have to immediately start pumping XML data to the client continuously...for hours/days. Its that simple. So, I override "channelConnected" method and send data from that method, right?...thats great. I will be using the following ChannelFactory ChannelFactory factory = new NioServerSocketChannelFactory( Executors.newCachedThreadPool(), Executors.newCachedThreadPool()); NioServerSocketChannelFactory documentation

问题 private ScheduledExecutorService pool = new ScheduledThreadPoolExecutor(20); I'm running a task public void run() { if (queue.isEmpty()) return; ArrayDeque<Profile> current = new ArrayDeque<Profile>(); this.queue.drainTo(current, 20); MySQLStatement statement = this.wrapper.prepare(); while (!current.isEmpty()) { if (statement.isClosed()) return; Profile profile = current.poll(); statement.addBatch(profile.getId().toString(), ProfileBuilder.toJson(profile)); } statement.executeBatchAsync(); }

问题 I have the following: public ICollectionView Children { get { // Determining if the object has children may be time-consuming because of network timeouts. // Put that in a separate thread and only show the expander (+ sign) if and when children were found ThreadPool.QueueUserWorkItem(delegate { if (_objectBase.HasChildren) { // We cannot add to a bound variable in a non-UI thread. Queue the add operation up in the UI dispatcher. // Only add if count is (still!) zero. Application.Current

问题 The .NET / .NET Core Thread Pool uses two different categories of threads internally: worker threads and I/O Completion Port (IOCP) threads. Both are just usual managed threads, but used for different purposes. Via different APIs (e.g. Task.Start or ThreadPool.QueueUserWorkItem ) I can start CPU-bound async operations on the worker threads (which shouldn't block, otherwise the Thread Pool would probably create additional worker threads). But what about performing I/O-bound asynchronous

问题 So I have my Android Bluetooth application that has it's host and clients. The problem is, because I am making multiple connections, I need a thread to handle each connection. That's all milk'n'cookies, so I thought I'd stick all the threads in an array. A little research says a better method to doing this is using a Thread Pool, but I can't seem to get my head around how that works. Also, is it actually even possible to hold threads in an array? 回答1: A thread pool is built around the idea

问题 There are 5 threads running in an infinite loop. 2 of them will send messages when queue is not empty. 4 of them will keep sending heartbeat within 5 minutes. 1 of them is to request data from another source. When it utilizes 100% of the CPU, I can not use any other applications in the window. The whole window becomes very slow. EDIT: can sleep be put after WaitOne? if(autoEvent.WaitOne()) { } else { } Thread.Sleep(100); Can sleep be put after subscriber.Recv() which is ZeroMQ ? all threads i

问题 I'm trying to figure out how I can get the maximum performance from a multithreaded app. I have a thread pool which I created like this: ExecutorService executor = Executors.newFixedThreadPool(8); // I have 8 CPU cores. My question is, should I divide the work into only 8 runnables/callables, which is the same number as the threads in the thread pool, or should I divide it into say 1000000 runnables/callables? for (int i = 0; i < 1000000; i++) { Callable<Long> worker = new MyCallable(); //