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I have a console app that I'm porting to WPF. The application has 3 worker threads, that are all joined to the main thread before some output results are printed to the screen. My understanding is that, if I try and do the same thing in a WPF application, the GUI will be blocked and will not be reponsive to the user. How then can I notify the parent thread that all the threads have completed their work? I think the solution is going to involve delegates and events (or maybe BackgroundWorker?), but it was not clear to me how to get the callback invoked when the thread terminated.
Original Code:
foreach (Thread t in threadList)
{
t.Start();
}
foreach (Thread t in threadList)
{
t.Join();
}
// print some results here
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Here's another example which shows that if the parent thread dies, the child threads will also die.
Because if parent thread dies or terminates then child thread should also die or terminate.
Modern ways to suspend/stop a thread are by using a boolean flag and Thread. interrupt() method. Using a boolean flag: We can define a boolean variable which is used for stopping/killing threads say 'exit'. Whenever we want to stop a thread, the 'exit' variable will be set to true.
Unlike Unix process, plain Haskell thread, created by forkIO, has no parent-child relation each other. This means termination of parent thread doesn't result its children also terminated.
If you are using three BackgroundWorkers, you can use the event RunWorkerCompleted to notice that one of the workers is completed: Before starting the workers set a counter to 3 then decrement and check this counter in the method called by RunWorkerCompleted if it hits 0 you are finished.
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