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Member Avatar for pwolf

I was following along to the following tutorial - [Derek Banas Java tutorial 18 - Threads pt2](http://www.youtube.com/watch?v=G2Xd5avyk_0) and as I decided to go over his tutorial series by following along in notepad++ and compiling with the command line, so that I can experiment and test things I'm unsure about, I …

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Member Avatar for r.nair3456

I have done most of the topics in core java.But i feel for web development u have to do advanced java.Then struts then hibernate.I have heard that c# is almost same as core java(j2se)so shall i proceed with .net because i have heard its not that lengthy and u have …

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Member Avatar for tricket_7

I am to create a program which creates multiple threads, has them do work in parallel, and terminates when the last thread is finished, sounds simple right? Here is the curve... I am supposed to create thread objects using scanner input, and I am at a loss When I run …

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Member Avatar for dhatsah

Quick question, the answer is eluding me on the internet. Which is unusual. When we reference and call a sub/function from a class is it automatically started on a new thread or will it join the main thread? Cheers in advance.

Member Avatar for Ancient Dragon
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Member Avatar for r.nair3456

hi, its like this i did c++ at my school level for almost 2 years....its been 6 years since i have done any programming.....due to college studies......now i want to move to android development......for that i need to learn core java(j2se).....its been one month i have been doing j2se.....covered oops,classes,objects,inheritance,excepti... …

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Member Avatar for greatman05

Hello. I need to set up some pipes for a homework assignment as part of a bigger project. The issue I'm having is that the array (args) I'm using to populate the pipe arguments keeps segfaulting and I don't know why. Everything has been malloced beforehand and the faults only …

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Member Avatar for manaila

Hi, I have learned that servlet containers like tomcat handle concurrency in web application. I just want to get a clear comfirmation whether I dont have to multithread my business logic classes/methods(e.g database connections) when I am developing servlet applications. Cheers!

Member Avatar for LastMitch
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Member Avatar for haresh.sankarraj

Hi members, This is a program i wanted to implement semaphore between parent and child processes which are trying to access a shared variable called counter ... i dont know why it is not getting incremented during the child process !! someone help please !! #include <stdio.h> #include <sys/types.h> #include …

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Member Avatar for emaellie

Hi ya guys, I have been learning about forks and processes, below is my code that i have created but am having difficulty on certain things. **1. Add code to print out and note the values of :** i. The values held within the array fd[ ] from the parent …

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Member Avatar for Labdabeta

This is more of a tale of "I think I broke it". Basically as an assignment for CS I have to write an assembler for a subset of the MIPS assembly language. Currently it is not working, getting a sigseg, so I decided to debug the code and step through …

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Member Avatar for phorce

I don't know why I'm having such a problem with this, basically, I want to have a Queue that is constantly running during the program called "Worker" this then works, however, every 10 seconds or so.. Another method called "Process" comes in and processes the data. Let's assume the following, …

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Member Avatar for Qwert_1

Here is a code that creates two childern using fork. My question is how can we create mutiple grandchildern and great grandchildern at the same time . And the line 21 of code gives an unexpected output i.e instead on one parent id it gives three id's. Here is the …

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Member Avatar for Vish0203

Hi, I was working on an application but i'm stuck at a point now.. I'm able to send the chat messages but unable to receive any... I have two threads, 1 for sending message and another for receiving but receiving part isn't working! I think the problem is with multithreading! …

Member Avatar for Absaar
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Member Avatar for Ancient Dragon

I have a program with DataGridView which is bound to MS Access table. When I addept to update I get "Syntax error in INSERT INTO", but no explanation about the syntax error. Column names in the table have a space in them, such as "Last Name". Could that be the …

Member Avatar for Ancient Dragon
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Member Avatar for yssirhc

Further along in this code I'm trying to access processRow, which is of type DataRow, but I get a RowNotInTableException This row has been removed from a table and does not have any data. In an attempt to figure out when this data is getting deleted, I added a bunch …

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Member Avatar for Rahul47

I was reading through Javascript overview on a webiste that stated following: 1) JavaScript can not be used for Networking applications because there is no such support available. 2) JavaScript doesn't have any multithreading or multiprocess capabilities. My Questions: 1) Which kind of 'Networking Applications' are we talking about? 2) …

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Member Avatar for John Linux

In a past prac. exam for an algorithm course I'm doing is the challenge below, and their are no solutions but it seems like a really interesting one to solve. Can someone please help and point me in the right direction, I would like to try this on my own, …

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Member Avatar for poopuh

I've been asked to edit the code in this post http://www.daniweb.com/software-development/java/threads/455560/java-recursion-brute-force-sim so that it "Runs the function as a thread which wouldn’t then hang the program whilst it’s waiting for the result". I've looked it up, but I'm struggling to apply it to this program, any tips?

Member Avatar for JamesCherrill
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Member Avatar for nitin1

can anyone give me some good references or links or some guidelines to start with this ? i need to learn this. like i want to know how can i implement malloc, calloc, realloc etc. for this thing also, what do i need to learn firstly ? thanks. any kind …

Member Avatar for Ancient Dragon
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Member Avatar for terran1

Hello guys I have an application for face detection and recognition using OpenCV library and Qt (for multithreading and to handle XML files). When I run the app, it detects face and there is possibility to save it as a picture to a file. It happens after I click on …

Member Avatar for DeanMSands3
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Member Avatar for DJ-DOO

Hi Folks, I am writing an app that involves Client -> Server -> Client communication (one way traffic). I have my data transmitted from client A to the server, simple to test, just print to console, however, I'm trying to test to see if the data has been sent on …

Member Avatar for DJ-DOO
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Member Avatar for Ondrej.Behulek

Hello, I have a course that is Operational Systems.. My lecturer doesnt explain so much and after He say, You must solve this problem, because u r a programmer.. I have such a problem with linux programming. I put my code here, He wants, I must allow multi-client to server. …

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Member Avatar for cacofonix

Hi All, In my script, i am trying to call multiple fork call. if i call less than 10 times, its working fine. If i call more than 20 or 30 times, most of the process getting time out or died foreach my $ttyport (@processTTY) { my $pid = fork();Inline …

Member Avatar for coding101
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Member Avatar for Sandy20

Evniorment : Windows 7.0 , C++ , Multithreading I have created a new worker thread to receive data on socket & add it into static multimap. **code snap :** //remember mymultimap is static data type static std::multimap<string,string> mymultimap; EnterCriticalSection(&m_criticalsection); mymultimap.insert ( "aaa", "bbb") ); LeaveCriticalSection(&m_criticalsection); At same time my main …

Member Avatar for Banfa
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Member Avatar for AnkitGuru

Hi Guys, I've just started learning the multithreading in vb.net; Needless to say I'm facing issues. Please check the code written below as its not giving any output, it just hangs. Public Class Form1 Private Delegate Sub _invokeUIControlDelegate(ByVal errMsg As String) Dim Thread1 As New System.Threading.Thread(AddressOf doSome1) Dim Thread2 As …

Member Avatar for AnkitGuru
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Member Avatar for Fredszky

So i'm trying to make multiple clients logon to a server through filesockets, and perform simple commands like ls -l, ls, mkdir. I've managed to make one client recieve output of ls -l command, sometimes, its buggy. Now i've been sitting for days trying to figure out how to fork() …

Member Avatar for Fredszky
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Member Avatar for devilmaycry1

hi friends I've a code to compute integral with area function in code. I used Fork, and for returned values I must use shared memory. now I need to embed a semaphore in my code to control the critical area(here is shared memory). I don't know how to embed semaphore …

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Member Avatar for nytman

Dear list, i am new to python as well as new to programming with no previous programming experience, i have to design GUI in python and implement multithreading in it, and also perform multithreading at servers in query handling. I checked so many web pages and tried to learn basics …

Member Avatar for vegaseat
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Member Avatar for AutoPython

[B]!USING PYTHON 3.1![/B] Hello DaniWeb! Today I'm going to be posting a [B]simple[/B] threading tutorial. First of all, what is threading? Well, threading is just another way of doing a side task without interrupting the main program. Now here's a simple example. Let's say we are going to make a …

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Member Avatar for boiishuvo

Okay I am trying to write a program where a parent process creates three child processes. Also waits for each of them to finish. Here is my code: [code] #include <stdio.h> #include <unistd.h> main() { int i; // create 3 child processes for (i = 0; i < 3; i++) …

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Member Avatar for fabio.bozzo

Hi to all, I'm using the WIA Aut. Library [url]http://www.microsoft.com/downloads/details.aspx?familyid=a332a77a-01b8-4de6-91c2-b7ea32537e29&displaylang=en[/url] , trying to capture photos from 5 digital cameras (Nikon D90) USB-connected to my pc. Now, I partially achieved my goal, what I do is: - loop through the attached devices, connecting to every camera; - fotocamera.ExecuteCommand (WIA.CommandID.wiaCommandTakePicture) ; - …

Member Avatar for vince8290
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Member Avatar for prashanth s j

Hi all, could anyone please provide me a simple example of python threads? I tried looking at the python cookbook, but I find it quite confusing with its mentioning of thread, threading etc (I am familiar with threads in C only) All I want is: From my machine I need …

Member Avatar for Gribouillis
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Member Avatar for crownedzero

Still playing with multi-threading and Prod-Con, at this point I've been at this for days. Would love some help debugging; thanks in advance. http://pastebin.com/jhHB9kTY - Main http://pastebin.com/BZSspf3x - Consumer http://pastebin.com/ndzAADJz - Producer http://pastebin.com/p7YdzH1D - Product http://pastebin.com/rxs3WzDT - Message http://pastebin.com/JR5ywgz1 - Utiliy 2 Producers, 4 Consumers Essentially Producers push a message …

Member Avatar for crownedzero
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Member Avatar for shujat132

**My academic assignmentt ** **Please help me in coding for this assignment** In Linux Ubuntu flavor, write a program in C language to do the following tasks. 1) Use fork ( ) system call to create a child process. 2) Child process should first take student name as input and …

Member Avatar for khudayar
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Member Avatar for crownedzero

I see this example frequently and thought I'd give it a shot but I've got something unexpected happening with my Queue. I have multiple threads utilizing my producer class but the output doesn't show that it is being written to by each thread. protected Queue<ProductMessage> prodQueue = new ConcurrentLinkedQueue<>(); @Override …

Member Avatar for ~s.o.s~
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Member Avatar for jnewman3

I'm applying the peterson solution for protecting memory of the critcal section. Each child process should contain a local variable that keeps track of the number of times it interrupts the other child while it is in its critical section. The process should display this value before terminating. I'm having …

Member Avatar for Ancient Dragon
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Member Avatar for khalidshakar

What is the way that need to be implemented in java to make a server broadcasts a voice to multiple clients, instead of broadcast voice only to one client? for example I am doing a server which can broadcast voice to multiple clients at the same time, now my server …

Member Avatar for khalidshakar
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Member Avatar for //Gonz

Hello all I am writing a solicitor allocation application that will be used by multiple users at one time. Because of this, the database needs to be updated with every change. This is my code when a solicitor is chosen for allocation: private void FindSolicitor(int type, bool stype) { table …

Member Avatar for //Gonz
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Member Avatar for rahul.ch

public class Thread7 implements Runnable { public static void main(String r[]) { Thread t = new Thread(new Thread7()); t.start(); public void run() { System.out.println("C"); System.out.println("D"); } System.out.println("A"); try { t.join(); System.out.println("B"); } catch(Exception e){} } } Query1: On compiling this program I get "illegal start of expression" error pointing to …

Member Avatar for delta_frost
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Member Avatar for omkar_hande

If a child process encounters exit(0) statement, where is this exit status returned in the parent process? Is there any variable associated with every process that holds this information? If not, how do children and parent processes communicate?

Member Avatar for poornamoksha
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Member Avatar for wschamps42

Can somone please explain to me what does fork() != 0 mean? From what I understand I think it means if fork is not false? Or if fork is true then.... I dont understand how Fork() can be true or false, seeing that it just creates a copy of a …

Member Avatar for np complete
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Member Avatar for Zeref

Hi guys, So I'm busy writing an application that needs to update a list from the web after a certain amount of time. main.py file class Gui: def ...... def ...... def ...... def on_update_click(): update() app=Gui() Gtk.main() So when the program loads up, user will click the update button …

Member Avatar for Zeref
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Member Avatar for kytro360

Hello, I am trying to multithread a listBox which has URL's in it. Basically what I am trying to do is to make it so each thread I make, will visit one of the URL's in the listBox and do a GET request. I was wondering how do I make …

Member Avatar for kytro360
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Member Avatar for malrofo

Being on a core i5 sandybridge mobile processor, I have the option to have dual core, hyperthreading, or both enabled. Which should be disabled to lengthen the battery life and still have decent performance?

Member Avatar for sheikhali449
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Member Avatar for david56connor

Hi there, I have a piece of code that I made to handle the joining of 'characters' in to a 'raid' on a game. The program refreshes a page to check if the 'raid' is available, if it is, it 'forms' the raid and 'joins' the characters. The joining process …

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Member Avatar for Remy the cook

I wanted to write the brute force algorithm for string matching by multithreading. I have made the program by using a single thread. In multithreading sample code, I have initialised the no. of threads to be strlen(text)-strlen(pattern). I do the matching in the ThreadFunc. Do I have to divide the …

Member Avatar for Lucaci Andrew
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Member Avatar for JOSheaIV

So awhile back I came here asking for help trying to read in data from a webpage, more specifically the HTML. I was running into an issue where the data wasn't actually being read (as if it hadn't loaded in). I had to put the program aside for awhile as …

Member Avatar for JOSheaIV
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Member Avatar for Commando123

Hey Guys i am doing a small project and i am using vb.net with MS access database. i am facing a Concurrency issue sometimes when i try to save data in the datagried view. i have added the datagried view by draging and drop the table from the data source. …

Member Avatar for Commando123
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Member Avatar for b.prog

So, my problem is that I want to run a process every 5 minutes, however I also want a console input which can modify its preferences and call functions depending console input. How can this be done system-independently?

Member Avatar for TrustyTony
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The End.