Search DaniWeb - thread-pool

Thread Pool Executor 13 Years Ago by emclondon …Guys, I'm trying to use a Thread Pool Executor in my application and I'm …stuck somewhere. My aim is to create a pool of fixed number of threads (say 10) waiting… in the pool to be called for action (say to print…to know, how a plain thread is created, how to create a thread pool, and how to use ThreadPoolExecution.… Re: Thread Pool Executor 13 Years Ago by emclondon …. bigger picture: I'm trying to write a thread pool which would be used to develop a pooling mechanism …30 seconds. smaller picture: I should create a small pool to show the demo on a scale model. ThreadPoolExecutor…paste everything. I want to know how a thread is implemented and thread pool in implemented, and how ThreadPoolExecutor can be … Re: Thread Pool Executor 13 Years Ago by JamesCherrill … you say "I want to know how a thread is implemented and thread pool in implemented" what are you asking? Do… easy) or just how you can implement (a) a simple thread and (b) a simple thread pool (easy)? Re: Thread Pool Executor 13 Years Ago by emclondon …With the help of my work colleague I coded a thread pool with 3 classes, pooler, runner and main where runner …4 threads and main has main function which calls the thread pool with runners instance. This works fine but when I … I run it I get an error [CODE]Exception in thread "main" java.lang.NoClassDefFoundError: MainClass (wrong name … Re: Thread Pool Executor 13 Years Ago by stultuske you can create your own thread classes by: a. extend the Thread class (which I would advise against) b. implement the Runnable interface what exactly do you mean by a 'Thread Pool Executor'? Re: Thread Pool Executor 13 Years Ago by JamesCherrill … program that instantiates your Runnable and creates a new Thread to run it. Improve the test program that to…load a few Runnables onto it. Create a new Thread that loops taking Runnables from the queue and running … a number of instances of that Thread simultaneously. Now you have a simple thread pool implementation. Do resist the temptation to… Re: Thread Pool Executor 13 Years Ago by emclondon … its 1st class) which invokes the superclass and creates a thread pool and I set the properties like poolsize, keepalive, etc and… WARNING: Interrupting idle Thread: http-thread-pool-17667 13 Years Ago by noirorlatte … running it, i got this [B]WARNING: Interrupting idle Thread: http-thread-pool-17667[/B]...i've changed the wait_timeout,interactive_time out in… show nothing, and i get this WARNING: Interrupting idle Thread: http-thread-pool-17667 in glassfish v3. I'm using netbean 6.8… Re: Thread Pool Executor 13 Years Ago by emclondon ….newFixedThreadPool(3); exec.execute(new RunnerClass("Thread#1")); exec.execute(new RunnerClass("Thread#2")); exec.execute(new RunnerClass… void run() { try{ System.out.printf("The Thread '%s' is Running",name); Thread.sleep(5000); System.out.printf("The… Re: Thread Pool Executor 13 Years Ago by emclondon … RunnerClass("this is a test",5,500); Thread thread = new Thread(runner); thread.start(); } } [/CODE] RunnerClass.java [CODE]package sj; public class…=0;j<=i;j++) { System.out.println(s); try { Thread.sleep(t); } catch(Exception e) { System.out.println(e.getMessage… Re: Thread Pool Executor 13 Years Ago by emclondon ah yes, I want to know how to implement a simple thread and pool. Re: Thread Pool Executor 13 Years Ago by stultuske implementing runnable will make your thread work just as fine. the best reason to extend a … 're not intending to adjust or improve the code in Thread, you just want to use it, that's why. next… Re: Thread Pool Executor 13 Years Ago by JamesCherrill That looks OK - test it with more than 1 runnable/thread. Does it run as you expect? Blocking Queues: Its a … it from anywhere, any time you want. You have a thread that takes the first item from the queue and processes… Re: Thread Pool Executor 13 Years Ago by emclondon …=0;j<=i;j++) { System.out.println(s); try { Thread.sleep(t); } catch(Exception e) { System.out.println(e.getMessage… Re: Thread Pool Executor 13 Years Ago by JamesCherrill … people will learn from it, especially if you mark this thread "solved" Re: WARNING: Interrupting idle Thread: http-thread-pool-17667 13 Years Ago by peter_budo Sound like you are using single db connection instead of pool that simple times out after certain time of inactivity and then a thread is trying to equerry DB but it is not aware that connection is down and it should create new connection. PS: Without knowing what is in code hardly anyone will be able to advice Re: Thread Pool Executor 13 Years Ago by JamesCherrill I googled ThreadPoolExecutor and immediately found loads of tutorials and examples for the use of this class. If your Google is broken I can forward some of them to you :-/ Re: Thread Pool Executor 13 Years Ago by JamesCherrill It's not the compiler that can't find them, its the runtime. It seems it can't find the .class file, maybe because it's not in a folder called threadpool in the classpath? Re: Strassen Algorithm Multithreading using Callable (Thread Pool) 8 Years Ago by JamesCherrill With 4x4 matrices I'm surprised you can even measure execution time meaningfully. I'm not surprised that the overheads of a thread pool would greatly exceed the time to do a few array maipulations. I guess each thread will complete within its first time slice. Re: Thread Exception 14 Years Ago by minitech …when an exception is thrown from another thread started using Thread.Start(), it terminates the thread, but when you are not debugging …that case, EndInvoke() throws the same exception that terminated the thread pool thread. If you do not call EndInvoke(), unhandled exceptions are ….Timers.Timer class, which also uses threads from the thread pool. { Concurrency } Thread 13 Years Ago by I<LateNupurGuha …"]if we do not take the help of [I]thread class[/I] or [I]runnable interface[/I] at all then… happens with other languages where there is no concept of thread, like C or C++ ? Does there [COLOR="Red"…[/B] differs and relates with [I]wait pool[/I] or [I]thread pool[/I] or [I]lock pool[/I]? Does it only stores [B… Reusing thread from vector 14 Years Ago by hasrule Hi, I was working on thread pool, which I used std::vector to implement the pool. [CODE] private: std::vector <…SIGSEGV) is always received when I take back the thread from the vector. what I want is to choose… and use previously created thread, not creating a new one by copying the thread previously created. So I … Re: pass variable by reference to each thread 13 Years Ago by mrar85 …]at Thread[pool-1-thread-1,5,main]sum is 1 at Thread[pool-1-thread-4,5,main]sum is 1 at Thread[pool-1-thread-2,5…,main]sum is 1 at Thread[pool-1-thread-3…,5,main]sum is 1 at Thread[pool-1-thread-3… Re: pass variable by reference to each thread 13 Years Ago by ~s.o.s~ …tacked on to the end. > and about the thread pool thing, she said that is how you create multi-…threading....explain that please Thread pools are the new abstraction offered by the standard… library to replace the old Thread() construct for doing background activities and submitting tasks. … Re: How to know when a thread ends. 16 Years Ago by Ezzaral …lt;LongTask>(); // create and submit tasks to thread pool for (int i = 0; i < …quot; %"); monitor.setProgress(percentComplete); } // shutdown the thread pool execService.shutdown(); } } /** Mock task that does an … Re: Need Help Building Background Worker Thread 15 Years Ago by sknake …probably use the thread pool and stay away from creating threads with the [icode]Thread[/icode] class …ReadOnly Property ThreadCount() As Integer Get Return Thread.VolatileRead(threadCnt) End Get End Property Public… CleanupCallback), fName) 'Run cad on another thread 'Since the other threads execution is at the… Re: Reusing thread from vector 14 Years Ago by hasrule o0ops, you re right nothing wrong with that code. I just forgot to assign the threadpool to the object that use the pool. So, it's SIGSEV :D anyway, your reply would really help me in further development. Re: Reusing thread from vector 14 Years Ago by mike_2000_17 …handlerthread which, I assume, has an internal handle to the thread that it is running (windows HANDLE or posix pthread* … no sense to have two handlerthread objects referencing the same thread of execution. So a move-constructor, is just a… operation. Otherwise, if an object owns resources (like a thread handle) it should not be copyable if it's not… Re: Reusing thread from vector 14 Years Ago by mike_2000_17 … problem is with handlerthread. Are you sure that once a thread is started that it remains valid when going back to… is destroyed, or its internal handle to the actual OS thread (pthread or whatever) goes invalid (i.e. terminates). So, the… Re: Plz help me to increase the speed of making image thumbnails using thread or any way! 15 Years Ago by qauaan [QUOTE=sknake;957237]Yes .. just move the code you have off in to a thread and away you go. You would want to use the thread pool and and feed file names to your thread starter since you have a fixed set of logic to run on each file.[/QUOTE] Sknake, I have no idea about thread pool. can you give some explanation and give some code snapshoot.