To solve a problem (and better my understanding of multitasking) I have written a small thread pool implementation. This thread pool spins up a number of worker threads which pop tasks off of a queue as they are added by the client of the thread pool. For the purposes of this question when the task queue is empty the worker threads are a...
I am writing a windows service that uses ThreadPool.QueueUserWorkItem(). Each thread is a short-lived task. When the service is stopped, I need to make sure that all the threads that are currently executing complete. Is there some way of waiting until the queue clears itself? ...
A problem is that a particular resource cannot handle more than 1 request per second and I want to pass that parameter to a thread pool that manages all concurrent calls to that resource. Is there any library that offers such kind of custom thread pool or I should look forward to implement my own? Thanks. ...
Hi, everyone, my program had been blocked , I used the jstack commander to analyze, the following thread took the lock "0x0000000603f02ae0" , and others threads couldn't fetch the lock. I had waited at least one hour, but the thread didn't unlock , my question is why the thread'state is RUNNING, and stop at java.util.HashMap.getEntry(Has...
What are the disadvantages of creating my own threads inside a managed environment like a weblogic application server? I have always used managed threads (using the WorkManager api) whenever i am working inside an application server. However I am unclear on the disadvantages or issues that might be caused by using non-managed threads ins...
Situation: I'm am using named pipes on Windows for IPC, using C++. The server creates a named pipe instance via CreateNamedPipe, and waits for clients to connect via ConnectNamedPipe. Everytime a client calls CreateFile to access the named pipe, the server creates a thread using CreateThread to service that client. After that, the ser...
Is it safe to start a thread pool in an objects constructor? I know that you shouldn't start a thread from a constructor, something about the "this" pointer escaping (I don't exactly understand this, but will do some more searches to try and figure it out). The code would look something like this: private ExecutorService pool; public ...
I have a simple thread pool written in pthreads implemented using a pool of locks so I know which threads are available. Each thread also has a condition variable it waits on so I can signal it to do work. When work comes in, I pick a thread by looking finding an available thread from the lock pool. I then set a data structure associate...
Our analytic server is written in c++. It basically queries underlying storage engine and returns a fairly big structured data via thrift. A typical requests will take about 0.05 to 0.6 seconds to finish depends on the request size. I noticed that there are a few options in terms of which Thrift server we can use in the c++ code, speci...
I've searched a lot but could not find a solutuion to my problem. I have my own class, BaseTask, that uses a ThreadPoolExecutor to handle tasks. If I don't want prioritization (i.e. using a LinkedBlockingQueue) this works just fine, but when I try to use a PriorityBlockingQueue I get ClassCastException because the ThreadPoolExecutor w...
Hello, I'm trying to understand some of the basics of using POSIX pthreads. The kind of thing I need to do (eventually) is parallelize some computations, using a thread pool model. At present I want to ensure I have a very basic sense for how the POSIX pthread model works. So I'm trying to create the simplest thread pool that's gen...
I want to lock other threads when one thread is running. It is possible in .Net with a lock object. I need do the same in AJAX. function f_OrnekleriGetir(bKaydet) { var ddlKlinikId = "<%=ddlKliniklker.ClientID%>"; var iKlinikId = $("#" + ddlKlinikId + " option:selected").val(); var arrOrnekNolar = new Arra...
Hi there, My scenario is this, I have a file that slowly gets populated over the course of an hour or two (mp3, video, etc). As this file is populated many users are connected to the server to receive new data as it is added to the server. At the moment each visitor connects to the server, and an IHttpAsyncHandler allocates a thread fr...
From a web page I start a time consuming job and update it's status on the UI using webmethod. Job is done in a thread: ThreadPool.QueueUserWorkItem(new WaitCallback(DoJob), parameters); Job set's it status using static properties, and when web page, using javascript, calls web method it read those properties. [System.Web.Services...
I'm doing some performance testing against an Apache server and getting the dreaded message "the context pool has been exhausted! Dun Dun Dun." (dramatic emphasis added) The current proposal floating around by the devs is to simply increased the connection pool-size. While this may be valid, little bells are going off in my head saying...
I create my threads as for (int i = 0; i < threadCount; i++) { Searcher src = new Searcher(i, this); threads[i] = new Thread(new ThreadStart(src.getIpRange)); threads[i].Name = string.Format(i.ToString()); } foreach (Thread t in threads) { t.Start(); } with threadCount(= 100, 150, 255 etc...) but I can...
MSDN, as well as many other sources, claim that worker threads in the thread pool are always background. "Thread pool threads are background threads." (MSDN) "Pooled threads are always background threads." (Threading in C#, Joseph Albahari) I can easily make the worker thread non-background by setting Thread.CurrentThread.I...
I’m running some performance tests on an ASP.NET MVC application. I see a high contention rate and the number of threads increasing overtime. I believe the two to be related, as threads are blocked new threads are created by the thread pool to handle incoming requests. I believe this in turn is making the contention worse (i.e. more thre...
Hi I would like to use the QueueUserWorkItem from the ThreadPool. When I use the following code everything works well. private int ThreadCountSemaphore = 0; private void (...) { var reportingDataList = new List<LBReportingData>(); ThreadCountSemaphore = reportingDataList.Count; using (var autoResetEvent = new AutoResetEvent(false)) { ...
I've read at many places that .net Threadpool is meant for short time span tasks (may be not more than 3secs). In all these mentioning I've not found a concrete reason why it should be not be used. Even some people said that it leads to nasty results if we use for long time tasks and also leads to deadlocks. Can somebody explain it in...