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Task Creation Options
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When you create a task, you can specify hints to the scheduler about how the task should be scheduled using the TaskCreationOptions class: AttachedToParent: The task is not attached to the parent. LongRunning: Hints that the task will run for a long time for optimal scheduling. None: Default scheduling behavior. PreferFairness: The tasks should be scheduled in the order in which they are created.
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Tasks can have the following status: Cancelled: The task was cancelled before it reached running status or the cancellation acknowledged and completed with no exceptions. Created: The task was created but not initialized. Faulted: Completed due to an exception that was not handled. RanToCompletion: Completed successfully. Running: The task currently running. WaitingForActivation: The task waiting to be activated and scheduled. WaitingForChildrenToComplete: Waiting for child tasks to complete. WaitingToRun: Scheduled but not yet run.
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Overriding TaskScheduler
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When tasks are created, they are scheduled using the default implementation of the TaskScheduler class (TaskScheduler.Default). TaskScheduler is abstract and can be overridden if you want to provide your own implementation.
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PARALLELIZATION AND THREADING ENHANCEMENTS
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TaskScheduler supports the ability to schedule items on the UI thread, saving you from writing some tedious marshalling code. For more info on this please refer to http://blogs.msdn.com/pfxteam/ archive/2009/04/14/9549246.aspx.
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Writing parallel and threaded applications is hard. To help, Microsoft has added additional debugging features to the Visual Studio IDE (premium versions include additional profiling features). To demonstrate these features, we will create a new simple console application. Create a new project called 5.Debugging and enter the following code: using System.Threading.Tasks; static void Main(string[] args) { Task task1 = Task.Factory.StartNew(() => startAnotherTask()); Task task2 = Task.Factory.StartNew(() => startAnotherTask()); Task task3 = Task.Factory.StartNew(() => doSomething()); Console.ReadKey(); } static void startAnotherTask() { Task task4 = Task.Factory.StartNew(() => doSomethingElse()); } static void doSomething() { System.Threading.Thread.Sleep(500000); } static void doSomethingElse() { System.Threading.Thread.Sleep(500000); } Put a breakpoint on the line that reads as follows: Task task3 = Task.Factory.StartNew(() => doSomething()); The first feature we will look at is the Parallel Task window.
Parallel Task Window
This window shows you all the tasks that are currently running and contains features for filtering and jumping directly to where the task is declared. Run the application in debug mode, ensuring that you have added a breakpoint to the first line. When the breakpoint is hit on the main menu, go to Debug Windows Parallel Tasks (Ctrl+Shift+D+K)
PARALLELIZATION AND THREADING ENHANCEMENTS
and you will see a window like the one shown in Figure 5-5 that allows you to review the current status of all your tasks.
Figure 5-5. Parallel Tasks debugging window The Parallel Tasks window offers the following functionality: You can order the view by clicking the column headings. You can group tasks by status by right-clicking the status column and selecting Group by status. To show more detail about a task, right-click any of the headings and check the options you want to view. Note that Parent is a useful option that displays the ID of the parent task that created it (if any). You can double-click the task to be taken into the code that task is running. Tasks can be flagged to help you identify them and filter views. To flag a task, simply click the flag icon on the left side. Tasks can have one of four statuses: running, scheduled, waiting, or waitingdeadlocked. If you have a task with waiting or deadlocked status, move the mouse over the task to display a tooltip of what it is currently waiting for. Tasks can be frozen by right-clicking them and selecting the Freeze Assigned Thread option. Select the Thaw Assigned thread option to unfreeze them.
PARALLELIZATION AND THREADING ENHANCEMENTS
TIP When debugging parallelized applications, it is also useful to have the threads window open by going to Debug Windows Threads.
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