How do task killers work?

In a nutshell, Automatic Task Killers work by polling the OS for a list of currently running processes and the memory they are consuming. Then either with an intelligent algorithm or with user input the Task Killers issue a call to the system telling the system to kill the process. There are two apis you … Read more

How to bring a background task to the front below honeycomb?

In versions honeycomb and up, you can use MoveTaskToFront like so //Bring Task to front with Android >= Honeycomb if (Build.VERSION.SDK_INT >= 11) { ActivityManager am = (ActivityManager) getSystemService(Activity.ACTIVITY_SERVICE); List<RunningTaskInfo> rt = am.getRunningTasks(Integer.MAX_VALUE); for (int i = 0; i < rt.size(); i++) { // bring to front if (rt.get(i).baseActivity.toShortString().indexOf(“yourproject”) > -1) { am.moveTaskToFront(rt.get(i).id, ActivityManager.MOVE_TASK_WITH_HOME); } … Read more

Task constructor vs Task.Run with async Action – different behavior

The answer is here http://blogs.msdn.com/b/pfxteam/archive/2011/10/24/10229468.aspx In effect the issue is that with new Task, and that it can only take a Action, whilst you are trying to give a Func<Task>. Here are the first two lines again, but rewritten using the correct overloads. Task t = Task.Run(async () => { await Task.Delay(2000); }); and Task<Task> … Read more

Run work on specific thread

Your approach seems fine, so you probably just made some tiny stupid mistake. It’s actually pretty easy to make a simple custom TaskScheduler. For your case: void Main() { var cts = new CancellationTokenSource(); var myTs = new SingleThreadTaskScheduler(cts.Token); myTs.Schedule(() => { Print(“Init start”); Thread.Sleep(1000); Print(“Init done”); }); myTs.Schedule(() => Print(“Work 1”)); myTs.Schedule(() => Print(“Work … Read more

How to convert a Task to a Task?

Does such a method exist? No. Is there any overhead to using an async method solely for this purpose? Yes. But it’s the easiest solution. Note that a more generic approach is an extension method for Task such as Then. Stephen Toub explored this in a blog post and I’ve recently incorporated it into AsyncEx. … Read more

C# – ThreadPool vs Tasks

The objective of the Tasks namespace is to provide a pluggable architecture to make multi-tasking applications easier to write and more flexible. The implementation uses a TaskScheduler object to control the handling of tasks. This has virtual methods that you can override to create your own task handling. Methods include for instance protected virtual void … Read more

caching the result from a [n async] factory method iff it doesn’t throw

Does this get anywhere near your requirements? The behaviour falls somewhere between ExecutionAndPublication and PublicationOnly. While the initializer is in-flight all calls to Value will be handed the same task (which is cached temporarily but could subsequently succeed or fail); if the initializer succeeds then that completed task is cached permanently; if the initializer fails … Read more

Execute task in background in JavaFX

JavaFX has Event Dispatch Thread which it uses for UI events. All work with UI should happen on this thread. And non-UI calculations shouldn’t happen there to avoid lags in UI. See next code: public class Indicators extends Application { public static void main(String[] args) { launch(args); } @Override public void start(Stage stage) { Pane … Read more

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