the problem is that when i put a new task in the queue the thread does not begin to pop from the queue Because it is terminated. If the thread is terminated when you push items, you must create a new one. Terminated means “done, from the OS point of view”. It will not restart. … Read more
Try this: if (!MyTextBox.Dispatcher.CheckAccess()) { MyTextBox.Dispatcher.Invoke(() => { MyTextBox.Text = myReceivedMessage.ToString(); }); } else { MyTextBox.Text = myReceivedMessage.ToString(); } 2 solved write to text box from a thread in after aborting thread WPF C# [duplicate]
From https://docs.oracle.com/javase/7/docs/api/java/util/ConcurrentModificationException.html For example, it is not generally permissible for one thread to modify a Collection while another thread is iterating over it. In general, the results of the iteration are undefined under these circumstances. Some Iterator implementations (including those of all the general purpose collection implementations provided by the JRE) may choose to throw … Read more
When it comes to “current date or time”, it means “randomness”. The reason of the different output of your code is not multi threads, but the new java.util.Date() Thread switching can cause randomness also, but it is very easy to avoid because of the existence of locks. Your code also has lock by using JAVA … Read more
You should use Qt signaling mechanism. class QWindow : QMainWindow { //this macro is important for QMake to let the meta programming mechanism know //this class uses Qt signalling Q_OBJECT slots: void updateLabel(QString withWhat) … }; And now You just need to connect this slot to some signal class SomeThreadClass : QObject { Q_OBJECT … … Read more
The general case depends on whether the threads are wholly independent of each other. If you go multi-threaded, you must ensure that any shared resource is accessed appropriate protection. The code shown has a shared resource in the use of srand() and rand(). You will get different results in a multi-threaded process compared with those … Read more
we are able to resolve the issue by applying below setting in the client configuration file .. refer …. blogs.msdn.com/b/darrenj/archive/2005/03/07/386655.aspx solved background worker blocking main thread .net [closed]
You’re right — unless your reason for running in the background fits within one of the categories that Apple has defined (playing audio, voip, etc.), your app won’t be allowed to run indefinitely in the background. If the reason you want to do that is really compelling, you might want to talk to Apple about … Read more
It is generally a bad idea to have file processing start immediately a file appears in a folder. For example if 100 files arrive at once then you will end up with 100 threads all competing for the same physical resources, e.g. disk heads etc. The best approach, in my opinion, is to have a … Read more
As a general rule, it’s more flexible to leave it to the user. For example, consider a map-type container. Suppose the application needs to atomically move something from one map to another map. In this case, the user needs to lock both maps before the insert-erase sequence. Having such a scenario be automatically taken care … Read more
The simple answer is eventually: no sooner, no later. You have no direct control over when garbage will be collected. Provided the instance has no more references to it, the garbage collector will clean it up at some point. 4 solved When will objects allocated on a thread be freed after the thread completes? [closed]
A CRITICAL_SECTION is a simple sync mechanism for multi-threaded. You use a CRITICAL_SECTION to protect a block of code from having two or more threads running it at the same time. You will not see a difference, with or without in most cases, it is there to protected shared resources from getting run over for … Read more
You don’t need goto. Period. Just learn to use Python properly. for i in range(1,10) : print i if i == 9 : print “find 9” break Applied to your actual code, the solution is almost the same: for char in chars : while True: if sem.acquire : filename += char t = threading.Thread(target=get200, args=(root … Read more
The issue: you are calling join method for empty thread – you cannot do this, when you call join on non-joinable thread you will get exception. In this line thread threads[MAX_THREADS]; you created MAX_THREADS threads using its default constructor. Each thread object after calling default ctor is in non-joinable state. Before calling join you should … Read more
bitblt(Masterbitmap.Canvas.handle, 0, 0, XPixel, YPixel, bitmap.Canvas.handle, 0, 0, srcand); you explicitly called Masterbitmap.Canvas.Lock, however you didn’t call bitmap.Canvas.Lock (so you can loose the canvas handle anytime within this call…) Additionally, you need to consider thread safety within GDI itself: Sharing of any GDI objects between different threads should be avoided at all cost. For example … Read more