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How to start several threads from methods?


How to start several threads from methods?

By : user2955152
Date : November 22 2020, 10:38 AM
fixed the issue. Will look into that further You cannot run both UpdateHour and UpdateMinute in the same thread, because the first one to start will just block the other one. If you want to run two blocking loops like that, each one will require its own thread.
Also, it is not thread-safe to directly call GUI methods from outside the main GUI thread (i.e. the one in which the application first starts). Instead, you should define custom signals to be emitted from the worker threads:
code :
class UpdateHours(QtCore.QObject):
    hourChanged = QtCore.pyqtSignal(object)

    @QtCore.pyqtSlot()
    def updateHour(self):
        ...
        self.hourChanged.emit(hour)
    self.hourObject.hourChanged.connect(self.handleHourChanged)
    ...

    def handleHourChanged(self, hour):
       # do something with hour value...


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How to create a class that would have a 2 threads inside and array of public methods that are not in that threads? (C++,

How to create a class that would have a 2 threads inside and array of public methods that are not in that threads? (C++,


By : user2435437
Date : March 29 2020, 07:55 AM
Hope this helps The example is a little strange, as the results would be random, depending on the exact coordination of the threads and sleep times. However, to get what you want, you have several options. You could create a new class with:
The code of your main function as a class method; The c (sum) variable would be a class member; The code of the method would return the sum.
code :
class TwoThreads
{
    int sum;

public:
    int doSomething()
    {
        // Same code as in main, using "sum" as the accumulator variable
        return sum;
    }
};
Start new threads in each loop and control amount of threads to be not more than x-amount at the same time

Start new threads in each loop and control amount of threads to be not more than x-amount at the same time


By : Brian Rowlett
Date : March 29 2020, 07:55 AM
around this issue If you're on .NET 4 you can utilize Parallel.ForEach
code :
Parallel.ForEach(MAIN_CASES_LIST, CASE => 
{ 

    //bunch of code here 

});
Synchronization on methods executing methods on other threads

Synchronization on methods executing methods on other threads


By : J.Rae
Date : March 29 2020, 07:55 AM
Hope this helps I'm writing a dummy code here that I think can demonstrate you an abstract architecture..
code :
public class GCMIntentService extends GCMBaseIntentService{
private static ArrayList<Message> messageQueue = new ArrayList<Message>();
private static boolean isProcessingMessage = false;

onMessage(Context context, Intent intent)
{
 if(isProcessingMessage)
   {
    Message currentMsg = new Message();//Create a instance of message and put it in arrayList

   }
   else{
         isProcessingMessage = true;
          for(int i  = 0; i < messageQueue.size(); i++)
             {//  Process all your messages in the queue here
               messageQueue.remove(i);
              }
              isProcessingMessage = false;
       }
}

 private class Message{

//In this class you can configure your message that you are going to queue.
}
}
Java - Priority of threads methods & other various methods in main()

Java - Priority of threads methods & other various methods in main()


By : Felix Kühn
Date : March 29 2020, 07:55 AM
Hope this helps When you start a thread it could happen almost immediately, i.e. before the next line is executed, and sometimes it has a small delay which could be a couple of milli-seconds, so it will appear later in the output.
Threads take a random amount of time to actually start.
How to start 1K threads and continously run the threads on the same task when they complete

How to start 1K threads and continously run the threads on the same task when they complete


By : DenseTax2
Date : March 29 2020, 07:55 AM
With these it helps You'll have to do it in the Runnable itself. Create a simple loop surrounding your actions. If you want them all to synchronize at a certain point, create a CountdownLatch with count 1000 and at the end of every iteration do a countDown and await.
Apache JMeter is a free performance testing tool that you can easily configure to test URL's in multiple threads. It can also distribute the tests to have e.g. 10 clients doing 100 threads instead.
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