threadpool

问题 I know there is a difference between this code: var streamWriter = new StreamWriter("something.txt"); streamWriter.WriteAsync("text"); and this: var streamWriter = new StreamWriter("something.txt"); Task.Run(()=> streamWriter.Write("text")); the first one makes much more sense. and in different scenario when I am awaiting a result, this code: var streamReader = new StreamReader("something.txt") char[] chars = new char[10]; Task<int> task = streamReader.ReadAsync(chars, 0, chars.Length); //Do

问题 Using Spring's integration api with Quartz , what will the effects be on cron jobs that have uncaught exceptions? Since the cronbean/worker thread did not catch the exception, will that mean the thread is dead and will not be able to go back to the SimpleThreadPool? If its dead and does not get back to the pool will that mean the SimpleThreadPool will need to create new threads, if say this happens multiple times thus emptying out the pool? This is a sample the stack trace: org

问题 GlassFish allows you to tune the global EJB pool size, as well as specific pool sizes per EJB. By setting the max-pool-size under glassfish-ejb-jar.xml I can control how many instances of a EJB can be used in parallel. <glassfish-ejb-jar> <enterprise-beans> <ejb> <ejb-name>MyExpensiveEJB</ejb-name> <bean-pool> <max-pool-size>10</max-pool-size> </bean-pool> </ejb> </enterprise-beans> </glassfish-ejb-jar> I wonder if something similar can be done with the Java EE Batch API. I would like to

问题 I have a Callable that makes a http request via Apache library. However, if the request takes too long, I would like to kill the thread. To do this, I can interrupt the Callable, but I need to catch the InterruptedException in order to stop myself. How can I do this? private final class HelloWorker implements Callable<String> { private String url; public HelloWorker(String url) { this.url = url; } public CloseableHttpResponse call() throws Exception { CloseableHttpClient httpClient =

问题 I have a lot of long running tasks that run in the background of my Python app. I put them all in the global QThreadPool . When the user quits, all of those background tasks need to stop. Right now, I have the following code: app.aboutToQuit.connect(killAllThreads) def killAllThreads(): QtCore.QThreadPool.globalInstance().waitForDone() I've seen suggestions to add a global variable that says whether the application should be quitting, and to have threads terminate themselves, but this sounds

问题 I've tried to implement a ThreadPool, but unfortunately I'm running into some problems. This is what I have already. //includes ... void call() { std::cout << "Hi i'm thread no " << std::this_thread::get_id() << std::endl; std::this_thread::sleep_for(std::chrono::seconds(2)); std::cout << "ready " << std::this_thread::get_id() << std::endl; }; //Implementation is not shown here to reduce code class WorkQueue { public: bool push(std::function<void()> const& value); void pop(); bool empty(); };

问题 I just did a simple experiment to show the total number of threads in a process using the code below. Console.WriteLine("Total Number of Threads: {0}", Process.GetCurrentProcess().Threads.Count); Parallel.ForEach( names, new ParallelOptions {MaxDegreeOfParallelism = Environment.ProcessorCount }, name => { Console.WriteLine(name); }); Console.Read(); Console.WriteLine("Total Number of Threads: {0}", Process.GetCurrentProcess().Threads.Count); I got 12 threads before the parallel.foreach and

问题 I call service method using ThreadPool.QueueUserWorkItem(o => service.Method(arg1, arg2)); Service has object 'loggingService' with I was get using Spring.Net private readonly ILoggingService loggingService = ObjectBuilder.GetObjectByName("LoggingService"); 'LoggingService' class is singleton. It writes log info to log.txt. When I try to call loggingService.Info("test") in this service method, I get exception: file is busy by another process. How can I access to the loggingService? 回答1: Your

问题 I have a bunch of parallel tasks to complete, but only a few worker threads (say 8, but I want this to be configurable). So, 8 threads run, and each of the threads pops the next task from the queue, as long as the queue has tasks. Does C++11 provide any inbuilt constructs to help implement this design? I see some similar discussions related to std::async , but I think it leaves too much to the implementation of the compiler. 回答1: You can have std::vector<std::thread> if you want but the pool

问题 I have a multi-threaded program (C#) where I have to share global static variables between threads that may take some time to execute (sending data request to another system using WCF). The problem is that using the lock statement does not seem to guarantee mutual exclusion when it's declared outside of the ThreadPool. static void Main(string[] args) { public static int globalVar = 0; public object locker; System.Timers.Timer timer1 = new System.Timers.Timer(1000); timer1.Elapsed += new