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Part V
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and AttachedToParent are identical to the flags offered by the TaskCreationOptions enumerated type shown earlier . Here is what the TaskContinuationOptions type looks like:
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[Flags, Serializable] public enumTaskContinuationOptions { None = 0x0000,// The default // Causes the default TaskScheduler to put the task in the thread pool's // global queue instead of a worker thread's local queue. PreferFairness = 0x0001, // Causes the default TaskScheduler to create a thread for the task instead // of queuing the task to a thread pool thread LongRunning = 0x0002, // Always honored: Associates a Task with its parent Task (discussed shortly) AttachedToParent = 0x0004, // This flag indicates that you want the thread that executed the first task to also // execute the ContinueWith task. If the first task has already completed, then the // thread calling ContinueWith will execute the ContinueWith task. ExecuteSynchronously = 0x80000, // These flags indicate NotOnRanToCompletion = NotOnFaulted = NotOnCanceled = under what circumstances to run the ContinueWith task 0x10000, 0x20000, 0x40000,
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// These flags are convenient combinations of the above three flags OnlyOnCanceled = NotOnRanToCompletion | NotOnFaulted, OnlyOnFaulted = NotOnRanToCompletion | NotOnCanceld, OnlyOnRanToCompletion = NotOnFaulted | NotOnCanceled, }
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When you call ContinueWith, you can indicate that you want the new task to execute only if the first task is canceled by specifying the TaskContinuationOptions.OnlyOnCanceled flag . Similarly, you have the new task execute only if the first task throws an unhandled exception using the TaskContinuationOptions.OnlyOnFaulted flag . And, of course, you can use the TaskContinuationOptions.OnlyOnRanToCompletion flag to have the new task execute only if the first task runs all the way to completion without being canceled or throwing an unhandled exception . By default, if you do not specify any of these flags, then the new task will run regardless of how the first task completes . When a Task completes, any of its continue-with tasks that do not run are automatically canceled . Here is an example that puts all of this together:
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Task<Int32> t = new Task<Int32>(n => Sum((Int32)n), 10000); // You can start the task sometime later t.Start(); // Each ContinueWith returns a Task but you usually don't care
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t.ContinueWith(task => Console.WriteLine("The sum is: " + task.Result), TaskContinuationOptions.OnlyOnRanToCompletion); t.ContinueWith(task => Console.WriteLine("Sum threw: " + task.Exception), TaskContinuationOptions.OnlyOnFaulted); t.ContinueWith(task => Console.WriteLine("Sum was canceled"), TaskContinuationOptions.OnlyOnCanceled);
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A Task May Start Child Tasks
Finally, tasks support parent/child relationships, as demonstrated by the following code:
Task<Int32[]> parent = new Task<Int32[]>(() => { var results = new Int32[3]; // Create an array for the results // This tasks creates and new Task(() => results[0] new Task(() => results[1] new Task(() => results[2] starts 3 child tasks = Sum(10000), TaskCreationOptions.AttachedToParent).Start(); = Sum(20000), TaskCreationOptions.AttachedToParent).Start(); = Sum(30000), TaskCreationOptions.AttachedToParent).Start();
// Returns a reference to the array (even though the elements may not be initialized yet) return results; }); // When the parent and its children have run to completion, display the results varcwt = parent.ContinueWith( parentTask => Array.ForEach(parentTask.Result, Console.WriteLine)); // Start the parent Task so it can start its children parent.Start();
Here, the parent task creates and starts three Task objects . By default, Task objects created by another task are top-level tasks that have no relationship to the task that creates them . However, the TaskCreationOptions.AttachedToParent flag associates a Task with the Task that creates it so that the creating task is not considered finished until all its children (and grandchildren) have finished running . When creating a Task by calling the ContinueWith method, you can make the continue-with task be a child by specifying the TaskContinuationOptions.AttachedToParent flag .
Inside a Task
Each Task object has a set of fields that make up the task s state . There is an Int32 ID (see Task s read-only Id property), an Int32 representing the execution state of the Task, a reference to the parent task, a reference to the TaskScheduler specified when the Task was created, a reference to the callback method, a reference to the object that is to be passed to the callback method (queryable via Task s read-only AsyncState property), a reference to an ExecutionContext, and a reference to a ManualResetEventSlim object . In addition, each Task object has a reference to some supplementary state that is created on demand .
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