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A task can return a value This is a very useful feature for two reasons First, it means that you can use a task to compute some result This supports parallel computation Second, the calling process will block until the result is ready This means that you don t need to do any special synchronization to wait for the result To return a result, you will create a task by using the generic form of Task, which is Task<TResult> Here are two of its constructors: public Task(Func<TResult> function) public Task(Func<Object, TResult> function, Object state) Here, function is the delegate to be run Notice that it is of type Func rather than Action Func is used when a task returns a result The first form creates a task that takes no arguments The second form creates a task that takes an argument of type Object passed in state Other constructors are also available As you might expect, there are also versions of StartNew( ) provided by TaskFactory<TResult> that support returning a result from a task Here are the ones that parallel the Task constructors just shown: public Task<TResult> StartNew(Func<TResult> function) public Task<TResult> StartNew(Func<Object,TResult> function, Object state) In all cases, the value returned by the task is obtained from Task s Result property, which is defined like this: public TResult Result { get; internal set; } Because the set accessor is internal, this property is effectively read-only relative to external code The get accessor won t return until the result is ready Thus, retrieving the result blocks the calling code until the result has been computed The following program demonstrates task return values It creates two methods The first is MyTask( ), which takes no parameters It simply returns the bool value true The second is SumIt( ), which has a single parameter (which is cast to int) and returns the summation of the value passed to that parameter.

// Return a value from a task using System;

24:

x=1/2

M u l t i t h r e a d i n g , P a r t Tw o : E x p l o r i n g t h e Ta s k P a r a l l e l L i b r a r y a n d P L I N Q

using SystemThreading; using SystemThreadingTasks; class DemoTask { // A trivial method that returns a result and takes no arguments static bool MyTask() { return true; } // This method returns the summation of a positive integer // which is passed to it static int SumIt(object v) { int x = (int) v; int sum = 0; for(; x > 0; x--) sum += x; return sum; } static void Main() { ConsoleWriteLine("Main thread starting"); // Construct the first task Task<bool> tsk = Task<bool>FactoryStartNew(MyTask); ConsoleWriteLine("After running MyTask The result is " + tskResult); // Construct the second task Task<int> tsk2 = Task<int>FactoryStartNew(SumIt, 3); ConsoleWriteLine("After running SumIt The result is " + tsk2Result); tskDispose(); tsk2Dispose(); ConsoleWriteLine("Main thread ending"); } }

Notice the rst two verbs are in the past tense: interviewed and tested The last verb, however, is constructed differently: can ask It would be better to maintain the same grammatical construction throughout:

The output is shown here:

Main thread starting After running MyTask The result is True After running SumIt The result is 6 Main thread ending

= 1 x

In addition to the forms of Task<TResult> and StartNew<TResult> used here, there are other forms available for use that let you specify other options

Part II:

The NET Framework 40 adds a new subsystem that provides a structured, yet highly flexible way to cancel tasks This new mechanism is based on the cancellation token Cancellation tokens are supported by the Task class, and through the StartNew( ) factory method (among others)

( ln x) 2

.