357 Topics
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| | I am having some problems with simulating POisson arrivals and departures in Java. I want to simulate 400 cars/hour as arrival rate and 20 cars/hour as departure rate. I have a parking capacity of 500 cars where these cars enter/exit. When I am checking occupancy values, even after a couple …  |
| | I am trying to run the following simple program which uses multithreading using pthreads. I compile it like: gcc -lpthread programName.c and it compiles fine. However, when I run it gives errors which I have pasted at the bottom of program. [code]#include<pthread.h> #include<stdio.h> void *thread_routine(void* arg) { printf("Inside newly created … |
| | Hi, Trying to get this bit of code to work so that a train goes up the track, leaves the track and then a train comes down the track, leaves and then a train comes up the track and so on. Only one train is allowed to go onto the … |
| | My understanding of this subject is - Two or more processes accessing a semaphore concurrently can cause Deadlock The provelms with semaphores is that you can forget to call the release method and it can cause deadlock Starvation Both processes can change the P and V counters of the semaphore … |
 | Hey; I am currently busy with multiprocessing and multithreading. There I saw a signal SIGCHLD which is an excellent zombie process cleaner by handling that signal. But when we are writing our handler function why we declaring it with an signal number arguement ? Is this arguement is automatically passed … |
 | Hi, I am working on a project which requires to update a JEditorPane or JTextField simultaneously by multiple clients. It is something like this. [B][1]. There are several users( i.e a group) with the same application which contains a JEditorPane. [2]. There is a group leader for a group( note: …  |
| | I have a multi-threaded application using over 500 threads and I want to log certain things that go on inside these threads to a single log text file, however not all the threads can access the file at the same time so how can I do this? The only way …  |
| | Hello, I've got a problem with simultaneous placement of an order in a webshop. I will start off with a general description of the problem, and provide details after that. **The problem** Orders are stored in the table 'orders'. Each order has a BillNumber, which is obtained via a mysql … |
| | In the name of God my IDE is visual studio 2010 (c#) I want to create 3 threads for 3 sort(bubble sort,quick sort & merge sort) to show which function sort quickly? for showing this I make 3 array of buttons(for every func. 1 arr) & I want to sort … |
| | hi guys am new to java and i have to display rotating images on a gui and use multithreading to alternate the four images. and i managed to create the gui but the images are not visible. the rotating images must be in the center of the frame. help.. |
| | Hi, I want to write thread function myself and don't want to use boost or AfxBeginThread(). Oh, and it works in /MD[d], /MD, MFX. Thanks a lot DestinyChanger |
| | Hi Guys, I am developing a VB application along with MS Access... When I initially load my form I need to put my application to sleep for 3 seconds or else data wont load properly. So for this 3 seconds I would like to show a progress bar displaying a …  |
| | Hi all, I am currently trying (and now wondering if) you can add multiple threads to a program to do the same job? Basically I am writing a web crawler for a search engine and it adds many URLs to an ArrayList which is used as a queue. I add … |
| | "Cross-thread operation not valid: Control 'DataGridView1' accessed from a thread other than the thread it was created on." I've been avoiding multithreading because of this since I started with vb.net a couple of weeks ago but it looks like I have to start using it now. I simply don't understand … |
| | Hi folks, Please forgive a bit of a n00b question, but I'm working with the SwingWorker class and want to create a subclass of this which includes an input type, as well as the existing output and progress-message types (so basically I'd have "CTSwingWorker< I, O, M >"). Now, I'm … |
 | I'm a beginner in c# and trying to do multithreading. I got 2 error that M and N need to be reference to be used in methods below. I thought if I define it as public int M,N;, they should be able to use in any methods in the class. …  |
| | What I tried to do here is There're 2 methods that each will have final result as an array. At this point I don't know where to go/ how to fix it. What I need is array U that supposed to be combination of U_1 and U_2. and I need … |
| | I have a program that must copy a file to 3 locations, the local hard disk, a USB drive, and a network location. I have the file (about 70mb) loaded into a byte array. My quesion is, since I'm not actively modifying the byte array, can I impliment a form … |
| | Hello everyone I am new to this site. I have a university assignment in which I need to program a 2 player pacman game, using C and the Unix operating system. If more than 2 users have typed the command to run the program/s the users must wait in FIFO … |
| | Hi all I'm designing a multithreaded application which has long running threads. I need to check some condititons in the main thread, interrupt the threads and end the program if the conditions are true. But i'm not sure if this is the correct/safest way. Here's my pseudo: [CODE]main() { boost::thread … |
| | i have a background worker with a sleep method inside a method. (winforms) here is the code that is executed: [CODE] private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { BackgroundWorker worker = sender as BackgroundWorker; int[] makeSelfMoves = new int[4]; foreach (KeyValuePair<int, int[]> item in replay)// count should be more than … |
| | Hi there, I have wrote a program that do a bit of calculations that takes about 10 min to complete, therefore I need to show a progress to user. I used a percentage in status bar to show the current status of program. The problem is for updating the number … |
| | Hi, I need to create a program to do a threaded merge sort (kinda), but in the meantime I am trying to pass a struct through the the Merge method (thread runs this method), but I keep getting seg faults. I am sure its something obvious, please help me out. …  |
| | Hi, I wanna traverse inside the file system by using threads and processes.My program has to assume the first parameter is either given as "-p" which offers a multi-process application or "-t" which runs in a multi-threaded way. The second parameter is the pathname of a file or directory. If … |
| | I want to parse through a root folder which is entered by the user by using multi threading and multi processing at different versions.But how can I distinguish while I am parsing through a root folder whether the next is a folder or a file?To summarize I want to learn …  |
| | I am creating new thread everytime in the for loop .. but many times the loop takes the same filename and creates new thread. Doesn't Work: [code] foreach (string s in fileEntries) { t = new Thread(() => Shrink(s)); t.Start(); } [/code] I have tried individually for each file creating … |
| | How to list all files in a folder including subfolder files. |
| | Hi there, I'm working on a project which incorporates the following: [LIST] [*]Reading data from XML [*]Writing data to XML [*]Interpreting XML and passing the information to various places [/LIST] These are on different threads, and I've used a Mutex to make sure they don't try opening the main XML … |
| | Hi all, I am looking for C++ multi threading under windows but i wasn't able to find any fruitful examples .Please provide me with some useful online books or links. TIA |
| | Hey; In my application I want to count number of seconds while the application is waiting for the user input. I think I should use another thread but I never worked with multithreading. Is there an easier way ? |
| | Hi all, I could really use some help with a multithreaded server/client application that I'm building. I'm first experimenting with basic concepts and then am going to implement the results within a larger application. However, I find myself stuck on a particular issue. Initially, I transfer a file from the … |
| | I'm trying to run audio in a different thread but I have no idea why but when I call wait(), my entire program seems to wait or hang.. not sure if it's deadlock since all it does is wait(), though if I set a time period, after that period it'll … |
| | this was probably a bad idea to begin with since i've never messed with multithreading or the sapi... but i got the sapi working on its own, but when I put it in its own thread it wont speak anymore. I've tried over and over and over.... i'm not sure … |
 | This is a great example for a thread stop. Simple debugging trick for any looped process that needs the "e-brake" applied while making sure that the thread is working correctly. The idea is that you can manually stop a thread, to prevent that hanging sensation during any process. This works … |
| | Hey I have a program that has a webBrowser navigate through a few pages, and when it gets to the last page I set it to navigate to, checks if there is a certain string on that page. I just switched my code around to use multithreading and now the … |
| | Heey Guy's, I'm having trouble understanding the Threading within an application. I will try to explain the program: 2 forms 1 parent (Server) 1 child (Client) both screens run on local computer (no network is needed) The server generates a random number once I've pressed a button. The number must … |
| | i'm wondering how to use a function named timer(); while executing another function at the same time??? can anyone help me with this?? i researched about threading but it's too complicated for me |
| | Hi Everyone! I have here a queue: [CODE]my $qTool = Thread::Queue->new();[/CODE] I want to show all the elements that the queue contains. [CODE]my $qItem = $qTool->peek();[/CODE] The code above returns only either the head of the queue or an element at a specified index. Is there a way for me …  |
| | Hey, I was trying to make a program which displays two chars A and B on the screen. Using the WASD keys, it lets you move the A char around and using the arrow keys it lets you move the B char around. I wrote the following: [CODE]Module Module1 Dim … |
| | Hello there, I'm new to C programming and am following a course in C. I've got an example code for piping. It's not a very hard code to understand. It goes like this: [CODE] #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <string.h> #define READ_END 0 #define WRITE_END 1 const char … |
| | Hi, I am using asp.net with SQL2008 facing a concurrent user issue, if 2 users launches the application and clicks save then it is allowing to save the record twice. I need to avoid saving duplicate record. How can i acheive this? 1 thing i thought of taking Modifiedat value …  |
| | Hey all. I have a deadline tomorrow, and this thing is killing me, so I come to you with hopes of help. I have a couple of classes. An info class, which converts a string to ints and puts it in the [B]values[/B] array. Another class (plotter), is supposed to … |
| | hello everybody.. recently I'm doing attendance software connected multiple RFID devices, the device doesn't support seeking new input automatically, so I need to implement the loop to seek next card automatically, the read function takes 3 parameters. I did read from each devices but separately. I need to read from … |
 | Hi, I was thinking of buying an 8 core Xeon 3.0GHz (16 threaded) cpu but still want more. Is it possible to buy two of these cpu's and stick them both in the same computer sharing the same power supply, graphics card etc. I know this might be a silly … |
| | Can anyone help me improve my source code below? I tried fixing it but apparently, there's not much success. [CODE] #define NUM_THREADS1 1 void *go_to_website2(void *program); void *go_to_website1(void *program) { char* str[3]; str[0] = (char *)program; str[1] = "http://www.google.com"; //supposedly 2nd website to go to str[2] = '\0'; char* new_prog … |
| | Hi guys, My group is having a software development project for our academics at a university. The software we want to develop is an inventory system which will be installed in a Local Area Network. We have decided to use Visual Studio C# (2005 or higher) as the front-end while … |
| | Can anyone help me improve my source code below? I tried fixing it but apparently, there's not much success. [CODE] #define NUM_THREADS1 1 void *go_to_website2(void *program); void *go_to_website1(void *program) { char* str[3]; str[0] = (char *)program; str[1] = "http://www.google.com"; //supposedly 2nd website to go to str[2] = '\0'; char* new_prog … |
| | I'm working on a tcp sever that recieves a message plus font, font size, text color, and background color, and direction to scroll. I have all of this working now, but I don't have the sever being able to recieve new messages and so forth. I need to get the … |
| | Hi, I'm writing a large program but require Multithreading for this software. I've searched the web for just over an hour and now is just after midnight but still can't find anything simple. The only thing I saw that came close to what I need was at [URL="http://www.computersciencelab.com/MultithreadingTut1.htm"]http://www.computersciencelab.com/MultithreadingTut1.htm[/URL] but I … |
| | Hi, I have some code which creates a PDF based on the data posted to the entry point page (print.aspx). When I run a page with multiple frames in, each accessing the main print.aspx and posting data etc. but for some reason each frame loads one at a time, rather … |
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