I have a programs that runs several threads (on a while loop until Ctrl C is pressed). The app also has a GUI that I developed in PyQt. However, I am facing the following problem: If I press Ctrl C on the console, and then close the GUI, the program exits fine. However, if I close the GUI first, the other threads won't stop and the prog...
Assume I have a class like this: public class Server { public static void main(String[] args) { Map<Integer, ServerThread> registry = Collections.synchronizedMap(new LinkedHashMap<Integer, ServerThread>()); ... while(true) { Socket socket = serverSocket.accept(); ServerThread serverThread = new...
I am having a confusion with threads. Suppose I start a thread in a ViewController which is doing some heavy processing. If I pop the viewController while the thread is still in execution will the thread stop executing or whether it will continue its execution. ...
Hi, I am trying to spawn a thread in rails. I am usually not comfortable of using threads as I will need to have a in-depth knowledge of Rails' request/response cycle, yet I cannot avoid using one as my request times out. In order to avoid the time out, I am using a thread within a request. My question here is simple. The thread that I...
What I am trying to do is have a small splash screen appear while my program is loading something. This is what I have: SplashScreen.showSplashScreen(); // Do stuff that takes time. SplashScreen.hideSplashScreen(); All the showSplashScreen() method does is create a new JWindow in the middle of the screen and make it visible. Now this...
I have implemented a windows xp service application that starts a couple of working threads. From one of the threads i need to send custom messages back to the service. How do i do that? ...
Hello everybody! How can i prevent an external OpenGL application(no sources available) from drawing like it can be done by GDebugger? The problem is Dassault Catia that opens complex models within five(!) hours because they are rendered while the loading is in process. When the border of this application is clicked and the mouse bu...
How can I make multi-thread (parallel) GET requests in PHP? I know that there is a CURL multi-thread support, but there is no limit of active requests number and actual callbacks configuration for every success request completion. ...
Hi all, at the moment I am struggling with a bug in Sun's class 'java.net.Authenticator'. It seems that the Authenticator class has a system wide static Authenticator. This results in the following problem in my multi-threaded application. Thread 1 - Authenticates for User 1 Thread 2 - Authenticates for User 2 Thread 1 - Executes the c...
Hello All, I'm running into kindof an annoying problem and would need some advice... Let's say I have a bunch of small MyObject's, that can construct bigger MyExtendedObject's. MyExtendedObject's are big and CPU consuming so construction is lazy, and I try do remove them from memory as soon as possible: MyExtendedObject * MyObject::Ge...
Sometimes I see the term "free-threaded" to describe a class or a method. It seems to have a similar or identical meaning to "thread-safe". Is there a difference between the two terms? ...
Currently I have a splash screen in place. However, it does not work as a real splash screen - as it halts the execution of the rest of the code (instead of allowing them to run in the background). This is the current (reduced) arquitecture of my program, with the important bits displayed in full. How can I adapt the splash screen curr...
I have following code: [TestMethod] public void StartWorkInFirstThread() { if (SynchronizationContext.Current == null) SynchronizationContext.SetSynchronizationContext( new SynchronizationContext()); var syncContext = SynchronizationContext.Current; Console.WriteLine("Start work in the first thread ({0}...
Let's say that what I want to do is to validate one million strings, and each validation takes a couple of seconds. My approach: I have an array of threads declared like this: Thread[] workers = new Thread[50]; I don't have all strings in an array, they are got through some calculations, then I don't have all of them when I start th...
Sometimes when I call RaiseEvent CanExecuteChanged(sender, EventArgs.Empty) from a back ground thread it give me an exception stating "The calling thread cannot access this object because a different thread owns it." However, if I call System.Windows.Threading.Dispatcher.CurrentDispatcher.CheckAccess is returns True. What am I doing w...
I use jstack to output the thread info. And there is a thread: "VM Thread" prio=10 tid=0x0878b400 nid=0x760a runnable What is this thread used to do? It takes 50% CPU usage and most of CPU time ...
Hi, I have deadlock detected error in my code and don't understand why. Could someone please tell me what am I doing wrong? #!/usr/bin/ruby ENV['RAILS_ENV'] = ARGV.first || ENV['RAILS_ENV'] || 'development' require File.expand_path(File.dirname(__FILE__) + "/config/environment") mutex = Mutex.new threads = [] 1.upto(10) do |i| t...
Say I have the following function in a module called "firstModule.py": def calculate(): # addCount value here should be used from the mainModule a=random.randint(0,5) + addCount Now I have a different module called "secondModule.py": def calculate(): # addCount value here too should be used from the mainModule a=random.rand...
Hello! I have a producer and a consumer. Producer fills its internal queue with objects, consumer takes these objects one by one. I want to synchronize the cosumer with the producer, so that the consumer blocks when there are no objects ready, and I want to synchronize the producer with itself, so that it stops producing when the queue i...
There’s an article about semaphores on OS X. The author tests the semaphore by incrementing and decrementing a static variable in two threads. With semaphore guarding the variable access, the variable ends up being zero. Without the guard the variable ends up having some bogus value. I tried the code and it works. What I don’t understand...