357 Topics
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| | Hi Everyone 👋🏼, I'm in a bit of a pickle, hopefully someone can provide some guidance. I have stale Firebase notification tokens in a database for an existing Xamarin application, initially (years back) the application never contained logic to refresh notification tokens. With the most recent update to the application … |
 | ## Introduction ## When working with WorkManager, it is important to know how to provide input data to your Workers. In this tutorial, we will learn how to provide basic input data to a Worker as well as when Workers are chained together. ## Goals ## At the end of … |
| | ## Introduction ## Whenever we want to modify numbers from multiple threads running concurrently, such as modifying a counter, one of the best options is to use the AtomicX classes. The most basic numeric atomic classes are AtomicInteger and AtomicLong. In this tutorial, we will learn how to use the … |
| | ## Introduction ## With coroutines in Kotlin, we are able to execute suspending functions without blocking the current thread. By default, most coroutine builder functions use the `Dispatchers.Default` context, but it is also possible to use other implementations of `CoroutineContext`. In this tutorial, we will learn about the 2 `CoroutineDispatchers`: … |
| | ## Introduction ## This tutorial introduces the `CyclicBarrier` class and teaches you how to use it. ## Goals ## At the end of this tutorial, you would have learned: 1. How to use `CyclicBarrier` to synchronize tasks across multiple threads. ## Prerequisite Knowledge ## 1. Intermediate Java. 2. Basic knowledge … |
 | Hello everyone, I have a problem with my app when closing the gui-UI, that is developed in PyQt5. In my app I have 3 discrete threads and one of it using slot-signals for communicating with the gui. The problem I have is that when I close the gui, and the … |
| | Hi everyone, I am working on an app and trying to create a corrector and I am using keyboard module for the correction. I have created a class, which reads pressed events and displays them to screen, and its action are dependent to a variable passed to the constructor. If …  |
 | Hi all, So before I went and posted ~800 lines of code, I have 2 questions: 1: What is the preferred way for us to post "complex" C++ (of course, this is just a .h, .cpp, and main cpp but it's still a lot of lines) that wont just be … |
 | Hello. As from the topic title, i am trying to work a multithread GUI where the progress bar indicates the running process completion (like we always see when we are installing/uninstalling/downloading). I've read a couple of written tutorials and some other forums discussions regarding the progress bar and multithreading. I've … |
 | I am trying to learn Volatile keyword in Multi Threading and I came across this statement: *Volatile is preferred in cases when one thread reads and writes a shared variable and other threads just read the same. Whereas if there are more than 2 threads performing read and write both …  |
| | I am trying to understand the SynchronizedMap and I ran the below code. I get the below Output with an exception. According to my understanding the exception is caused when the get() methods are trying to access the syncmap when a thread is still executing a write on the map … |
| | Hi everyone, I am working on a coin collection app, and I have recently started integrating core data into my app. My app is of the following format: I have a core data database which stores custom CoinCategory objects and each CoinCategory object has an array of Coin objects. This … |
 | 0 down vote favorite I have created a network scanner, that looks for a specific port on a range of IP's. I would like to thread the application but I am getting and error message ERROR: for worker in range(network.hosts): TypeError: 'method' object cannot be interpreted as an integer Now …  |
 | I'm currently working on multithreading with PyAudio and Pygame, but when I try to run the audio, I get an error saying "OSError: [Errno -9996] Invalid output device (no default output device)." So far I've tried these on Terminal: >>> import pyaudio >>> pa = pyaudio.PyAudio() >>> pa.get_default_input_device_info() {'name': 'Built-in … |
| | I'm trying to implement Callable for Strassen's algorithm to multiply two matrices. I'm new to this, and i'm having a few issues and I can't figure it out for the life of me :( . The first problem is that the program prints out 0 for all the elements of … |
 | I have two forms the first FrmRecipe.vb form has all my calulations and functions in it the second FrmReports has a crystal report viewer with loads of reports. I am trying to call the report as a thread so that the main from is still working however when the treads …  |
 | Hello dear memebers, after searching for a multiple chat client i have come across a multithreading chat system which i have attached the code .I have taken the code of the server class and added it to my application form as well as the gui.My question is(well i know it …  |
 | Hi Im trying to Populate my datagridview from data scraped off of webpage i Want to be able to report progress when datagrid finished updating.. with a progressbar.. Please Help!!!!!! Thank You.. Heres My code Dim theElementCollection As Windows.Forms.HtmlElementCollection theElementCollection = Form1.WebBrowser2.Document.GetElementsByTagName("a") For Each curElement As HtmlElement In theElementCollection Form1.DataGridView1.Rows.Add(curElement.GetAttribute("title"), … |
 | Hi, I got multiple threads in different classes created in this manner: private ThreadStart someName_TS; public Thread someName_Thread; public void someName() { someName_TS = new ThreadStart(someNameThread); someName_Thread = new Thread(someName_TS); someName_Thread.Start();} } private void someNameThread() { while(!Shutdown) { //Do heavy work } } The heavy work is set to a … |
 | Hi Dw. I'm deeply in need of your help, I'm having a problem that is giving me a very serious problem with my code. My program is a multithreaded program and its a TCP/IP based application. Client has no problem, only a server that is being so weid to me … |
| | Recently I started using my first attempt at Python multithreading. The purpose of the code is to run multiple WHILE loops at the same time, one of which searches for the change of a variable to TRUE caused by input picked up by the other. However, when i ran the …  |
| | Hi All, In below code snippet multithreading is used to take care of multiple requests from client. I beileve creating and detaching thread will eat lots of CPU cycle and it won't improve the CPU utilization as well. Can anybody let me know if thread pool can be used here … |
 | Hey, I have been reading Java oracle tutorials. I read this thing. Suppose, for example, class MsLunch has two instance fields, c1 and c2, that are never used together. All updates of these fields must be synchronized, but there's no reason to prevent an update of c1 from being interleaved … |
| | Hi Dw. I am developing a client server multi-thread application. This application uses signals(certain messages as signals), in order to perform a task for a client. For instance if a client wants to login, the client send a message as: `Login:<username>:<password>` and on a server I first check if the … |
| | i need your help please i need to create a loop for thread that does the following 1.thread for each number in the list box 2.Each thread calculates the Fibonacci number of the item that it is assigned to When the thread finds the Fibonacci number, it automatically adds it … |
| | I'm developing a game that has a word falling to the bottom of the screen and the user typing that word before it hits the bottom. So you'll be able to type input while the word is falling. Right now I have a timer that waits 5 seconds, prints the … |
 | Hi everyone this is my first code snippet so be gentle.. I have written a basic client/server chat program that uses multithreading for listening and sending. I welcome any improvements or discussion... Thanks James |
| | Hello, I have a very strange problem. I have created a code that I beleive is multicore/parallell threading to make a task to run faster using more cores in the computer. **My computer is a server: 32 cores (2 CPU with 16 cores each) 32 GB** Refering to my code: … |
| | So it seems google's go is changing the programming landscape, well there probably were other languages out there before but the google-sphere seems to deliver more clout, people take notice. Google Go appears to have done anyway with classical OOP, especially inheritence, although it can be realised via other ways. …  |
| | I have generated an image for my VU+ Solo2 after following the instructions on the following URL: http://blog.videgro.net/2013/05/how-to-compile-software-for-vu-plus/. This works OK if I use standard C-code (as in the example in the URL), but when I try to compile C++-code I get errors which seems to originate from using the … |
 | =======Download The Full Solution Below======== This will be my last VB.Net soure as I've made the move to C#. For a recent job application I was given the technical test to create a horse race simulator which would calculate the odds of a runner winning a race of up to … |
| | Hello, Please tell me how to implement multi threading in C++ on Ubuntu 10.10. The compiler I use is GNU 4.5.2. I have some knowledge of multi-threading in Java. Explain with some codes if possible. Or please give the URL of any useful stuff  |
| | I'm using Excel interop and it seems that this functionality needs to run in the User Interface thread. So I execute that from the ProgressChanged backgroundworker event. Is there a way to have the dowork event (that invoked the progress changed event) interrupt execution until the ProgressChanged event is finished? …  |
| | I have a server chat use socket and multithreading but i can't show data of client to my textbox, I only see that data when i use "Msgbox", I only take a warning about cross-thread...blah...blah but i think it's not my problem so i dismiss it by code: System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = … |
| | I'm trying to add a progress bar to a working theaded program that uses a cancelation token too. The structure of the program is: I have a button "BeginButton" that calls the function "MyFunction()". The function runs in another thread and a cancellation token listens if I press a Cancel … |
| | I have a Windows Forms application (not WPF) in which from the main form (UI thread) I am creating a separate thread to perform a long period of test execution. The idea is that the user starts the testing by clicking a button on the main form; when the user … |
| | i write a program its output is below G:\Java\Multithreading>java NewThread Child Thread Thread[main,5,main] Main Thread 1 Child Thread 1 Main Thread 2 Main Thread 3 Main Thread 4 Main Thread 5 Main Thread Complete Child Thread 2 Child Thread 3 Child Thread 4 Child Thread 5 Child Thread Complete in … |
 | Alright so I am getting a weird problem with the following code int toDB[2]; int fromDB[2]; char * param1; char * param2; err = pipe(toDB); if(err==-1) { printf("Error on pipe creation: %d\n", errno); exit(1); } sprintf(param1, "%d", toDB[0]); err = pipe(fromDB); if(err==-1) { printf("Error on pipe creation: %d\n", errno); exit(1); …  |
| | Run two calls to a function simultaneously with this threading @background decorator.  |
| | How do I use pipes to communicate with another proccess that is being run using an execl command? I know how I can send info to that process but how do I get info back from that proccess? Some more information on what Im trying to do: I am trying … |
| | i write a code of multithreading in which arise an race condition code is below class Race1{ public void show(String s){ try{ System.out.print("["+s); Thread.sleep(1000); }catch(InterruptedException e){ e.printStackTrace(); } System.out.println("]"); } } class Checking implements Runnable{ Race1 ob=new Race1(); String s; public Checking(String s){ this.s=s; } public void run(){ synchronized(ob){ ob.show(s); … |
| | when we create a thread like this class Run implements Runnable{ public void run(){ //You code } } class Helloworld{ public static void main(String args[]){ Thread t1=new Thread(new Run()); Thread t2=new Thread(new Run()); } } in above code thread t1 and thread t2 is creating in `main()` method its mean … |
| | For my project, I need to learn multithreading in C++. I have read 4-5 articles on Google, and have searched for more but they all are more or less similar. I want to learn it in depth. Can you provide me some links/source/anything for learning mutilthreading in C++? I am …  |
| | Hello all, My question is hopefully particular enough to not relate to any of the other ones that I've read. I'm wanting to use subprocess and multiprocessing to spawn a bunch of jobs serially and return the return code to me. The problem is that I don't want to wait() …  |
| | Hey guys, I'm interested in learning about simple multithreading in C++ for Windows. Does anyone have any reccommended tutorials/links thats quite good? |
 | I'm simply trying to keep a log list for my application events. I'm trying to send text to the log from a seperate thread with the following code: Imports System.Threading Public Class Main Private worker1 As Thread Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load worker1 = New …  |
 | I am on OSx and I am trying to exit the program by pressing CTRL+C. but it seems like even if I have a signal handler registered in main thread it doesn't exit while the thread is executing on pressing CTRL+C. Here is a piece of cake where I am …  |
| | I am trying to establish a pause and play communication between threads.I am spawning two threads for two forms at the startup, one is the mainthread which is for mainwindow and second thread of form2, var thread = new Thread(ThreadStart); thread.TrySetApartmentState(ApartmentState.STA); thread.Start(); private static void ThreadStart() { Application.Run(new SecondForm()); // … |
| | Hi, I have to create a program that creates N child processes, and they muliply the matrix. I have some base codes but when I try to run them they give me segmentation error and I cant find the problem. #include <stdio.h> #include <stdlib.h> #include <time.h> #include <unistd.h> #include <sys/types.h> … |
| | Hi All, I am learning Multithreading in Java and came across this code using SwingWorker for GUI multithreading. Here is the modified code done by me. import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.List; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.SwingWorker; public class MainFrame extends JFrame { … |
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