This is baffling me, maybe somebody can shine the light of education on my ignorance. This is in a C# windows app. I am accessing the contents of a listbox from a thread. When I try to access it like thisprgAll.Maximum = lbFolders.SelectedItems.Count; I get the error. However, here is the part I don't get. If I comment out that line...
Given a System.Timers.Timer, is there a way from the main thread to tell if the worker thread running the elapsed event code is still running? In other words, how can one make sure the code running in the worker thread is not currently running before stopping the timer or the main app/service thread the timer is running in? Is this a m...
I'm in the process of writing a piece of code that connects to a server spawns a bunch of threads using that connection and does a bunch of "stuff". There are certain instances where the connection fails and I need to stop everything and start from scratch with a new object. I wanted to clean up after the object but calling thread.stop...
I have some thread-related questions , assuming the following code (please ignore the possible inefficiency of the code,I'm only interested in the thread part): //code without thread use public static int getNextPrime(int from) { int nextPrime = from+1; boolean superPrime = false; while(!superPrime) { boolean prime = t...
I'm writing an application that does async loading of images onto the screen. I have it set up to be NOT concurrent (that is, it spawns a thread and executes them one at a time), so I've only overridden the [NSOperation main] function in my NSOperation subclass. Anyway, so when I add all of these operations, I want to be able later to ...
I have an method which save files to the internet, it works but just slow. Then I'd like to make the user interface more smooth, so I create an NSThread to handle the slow task. I am seeing a list of errors like: _NSAutoreleaseNoPool(): Object 0x18a140 of class NSCFString autoreleased with no pool in place - just leaking Without NST...
I have two C++ processes (A and B), executing under Windows, where one launches the other. I would like to effectively single-thread their execution. For example: Start process A A creates B A suspends B executes some fixed set of operations B suspends and A is resumed A executes some fixed set of operations A suspends and B is resumed...
Hi all, I am after a example of some code in powershell using the threadpool. my friends at google can not help me. Any example would be great. Donald ...
I was wondering if in Java I would get any odd behaviour if I synchronise twice on the same object? The scenario is as follows pulbic class SillyClassName { object moo; ... public void method1(){ synchronized(moo) { .... method2(); .... } } public void me...
I have a simple application with the following code: FileInfo[] files = (new DirectoryInfo(initialDirectory)).GetFiles(); List<Thread> threads = new List<Thread>(files.Length); foreach (FileInfo f in files) { Thread t = new Thread(delegate() { Console.WriteLine(f.FullName); }); thread...
The MSDN documentation says that public class SomeObject { public void SomeOperation() { lock(this) { //Access instance variables } } } is "is a problem if the instance can be accessed publicly". I'm wondering why? Is it because the lock will be held longer than necessary? Or is there some more insidious reason...
Hi, What is the most accurate way of timing a thread or a line of code in C# assuming the application is multithreaded? Kind regards, ...
I have a Winforms application created in Visual Studio 2005 Pro, it connects to an SQL Server 2005 database using the SqlConnection / SqlCommand / SqlDataAdapter classes to extract data. I have stored procedures in my database to return the data to me. What is the best way to handle queries that take a "long time" to complete? (i.e long...
I have an application which has to live as a service, I create an object which then spawns off a buch of threads. If I set the only reference to that object to null will all the child threads get cleaned up? or will I suffer from a memory leak. Do I have to explicitly terminate all the child threads? ...
Would there a more elegant way of writing the following syntax? Thread t0 = new Thread(new ParameterizedThreadStart(doWork)); t0.Start('someVal'); t0.Join(); Thread t1 = new Thread(new ParameterizedThreadStart(doWork)); t1.Start('someDiffVal'); t1.Join(); Presuming we want to pass 20 d...
I have a threading problem with Delphi. I guess this is common in other languages too. I have a long process which I do in a thread, that fills a list in main window. But if some parameters change in the mean time, then I should stop current executing thread and start from the beginning. Delphi suggests terminating a thread by setting Te...
I understand that creating too many threads in an application isn't being what you might call a "good neighbour" to other running processes, since cpu and memory resources are consumed even if these threads are in an efficient sleeping state. What I'm interested in is this: How much memory (win32 platform) is being consumed by a sleepin...
When I was learning Java coming from a background of some 20 years of procedural programming with basic, Pascal, COBOL and C, I thought at the time that the hardest thing about it was wrapping my head around the OOP jargon and concepts. Now with about 8 years of solid Java under my belt, I have come to the conclusion that the single har...
Our application is getting a System Call Failed RPC error from DCOM (0x80010100), we suspect that the target thread's message queue is full (although I'm not convinced this is ture). I know the queue is limited to 10,000 messages and I want to see if we're close to this number in the common cases. Is there a way to monitor the size of a ...
I am writing a multi-thread application in windows OS. All threads are runing as services. If I want to change the priority of service in run time, how can I do this? Does windows provide any API? Many Thanks! ...