threadpool

问题 I am trying to build an implementation of the ExecutorService , let's call it SequentialPooledExecutor , with the following properties. All instances of SequentialPooledExecutor share the same thread pool Calls on the same instance of SequentialPooledExecutor are executed sequentially. In other words, the instance waits for the termination of the currently executing task before start processing the next task in its queue. I am currently in the process of implementing the

问题 Say I have this: class Queue { private static ExecutorService executor = Executors.newFixedThreadPool(1); public void use(Runnable r){ Queue.executor.execute(r); } } my question is - how can I define the thread that's used in the pool, specifically would like to override the interrupt method on thread(s) in the pool: @Override public void interrupt() { synchronized(x){ isInterrupted = true; super.interrupt(); } } 回答1: Define how threads for the pool are created by specifying a ThreadFactory.

问题 Is there any way (apart form actual perfomance measurements which can be pretty hard to make them realistic) or rule of thumb when I should stop using the ThreadPool and use a dedicated Thread instead? I suppose for long running work it is better to use a dedicated Thread because it doesn't peramently steal one from the ThreadPool . For shorter work it is better use the the ThreadPool because creating threads and the thread itself consumes a lot of resources. But where is the magic barrier?

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 7 years ago . If I create a fixed size thread pool with 10 threads in java using Executor framework: private final ExecutorService pool; pool = Executors.newFixedThreadPool(10); and then try to submit more than 10 tasks (say

问题 There are a huge amount of tasks. Each task is belong to a single group. The requirement is each group of tasks should executed serially just like executed in a single thread and the throughput should be maximized in a multi-core (or multi-cpu) environment. Note: there are also a huge amount of groups that is proportional to the number of tasks. The naive solution is using ThreadPoolExecutor and synchronize (or lock). However, threads would block each other and the throughput is not maximized

问题 There are many solutions geared toward implementing "user-space" threads. Be it golang.org goroutines, python's green threads, C#'s async, erlang's processes etc. The idea is to allow concurrent programming even with a single or limited number of threads. What I don't understand is, why are the OS threads so expensive? As I see it, either way you have to save the stack of the task (OS thread, or userland thread), which is a few tens of kilobytes, and you need a scheduler to move between two

问题 Passing two parameters to a new thread on the threadpool can sometimes be complicated, but it appears that with lambda expressions and anonymous methods, I can do this: public class TestClass { public void DoWork(string s1, string s2) { Console.WriteLine(s1); Console.WriteLine(s2); } } try { TestClass test = new TestClass(); string s1 = "Hello"; string s2 = "World"; ThreadPool.QueueUserWorkItem( o => test.DoWork(s1, s2) ); } catch (Exception ex) { //exception logic } Now, I've certainly

问题 In my application I have 4 distinct processes, which run permanently with some small pauses. The current version of code executes each process in a separate old-school thread: Thread nlpAnalyzer = new Thread(() -> { // infine lop for auto restore in case of crash //noinspection InfiniteLoopStatement while (true) { try { // this method should run permanently, pauses implemented internally NLPAnalyzer.analyzeNLP(dbCollection); } catch (Exception e) { e.printStackTrace(); } } }); nlpAnalyzer

问题 As we create a Thread pool using Java's Executor service and submit threads to this thread pool, what is the order in which those threads get executed? I want to ensure that threads submitted first, execute first. For example, in the code below, I want first 5 threads to get executed first, followed by the next 5 threads and so on... // Create a thread pool of 5 threads. ScheduledExecutorService exService = Executors.newScheduledThreadPool(5, new ModifiedThreadFactory("ReadThreadPool")); //

问题 My Visual Studio crashes randomly. Event Viewer shows the following error Faulting application name: devenv.exe, version: 12.0.40629.0, time stamp: 0x5590c8a4 Faulting module name: KERNELBASE.dll, version: 10.0.15063.674, time stamp: 0x6d16dd24 Exception code: 0xe0434352 Fault offset: 0x000eb872 Faulting process id: 0x3b00 Faulting application start time: 0x01d34ecf7a049150 Faulting application path: C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\devenv.exe Faulting module