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It is important to understand that, by default, a task executes in a background thread Thus, when the creating thread ends, the task will end This is why ThreadSleep( ) was used to keep the main thread alive until MyTask( ) completed As you would expect and will soon see, there are far better ways of waiting for a task to finish In the foregoing example, the task to be concurrently executed is specified by a static method However, there is no requirement to this effect For example, the following program reworks the previous one so that MyTask( ) is encapsulated within a class:

// Use an instance method as a task using System; using SystemThreading; using SystemThreadingTasks; class MyClass { // A method to be run as a task public void MyTask() { ConsoleWriteLine("MyTask() starting"); for(int count = 0; count < 10; count++) { ThreadSleep(500); ConsoleWriteLine("In MyTask(), count is " + count); } ConsoleWriteLine("MyTask terminating"); } } class DemoTask { static void Main() { ConsoleWriteLine("Main thread starting"); // Construct a MyClass object MyClass mc = new MyClass(); // Construct a task on mcMyTask() Task tsk = new Task(mcMyTask);

24:

There are many good ways to concisely communicate those eight thoughts Barry decided to focus on his bottom-line objective I wanted them to submit ideas by Tuesday, before the meeting, he explained Read Barry s revision and then his comments:

Consider the sine function with domain restricted to the interval [ /2, /2] (Figure 615) We use the notation Sin x to denote this restricted function Observe that d Sin x = cos x > 0 dx on the interval ( /2, /2) At the endpoints of the interval, and only there, the function Sin x takes the values 1 and +1 Therefore Sin x is increasing on its entire domain So it is one-to-one Furthermore the Sine function assumes every value in the interval [ 1, 1] Thus Sin : [ /2, /2] [ 1, 1] is oneto-one and onto; therefore f (x) = Sin x is an invertible function 1 We can obtain the graph of Sin x by the principle of reflection in the line 1 y = x (Figure 616) The function Sin : [ 1, 1] [ /2, /2] is increasing, one-to-one, and onto The study of the inverse of cosine involves similar considerations, but we must select a different domain for our function We define Cos x to be the cosine function restricted to the interval [0, ] Then, as Figure 617 shows,

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

// Run the task tskStart(); // Keep Main() alive until MyTask() finishes for(int i = 0; i < 60; i++) { ConsoleWrite(""); ThreadSleep(100); } ConsoleWriteLine("Main thread ending"); } }

The output is the same as before The only difference is that MyTask( ) is now called on an instance of MyClass One other important point about tasks needs to be made now: once a task completes, it cannot be restarted Thus, there is no way to rerun a task without re-creating it

_ /2

Unlike Thread, Task does not include a name property It does, however, have an ID property called Id, which can be used to identify the task Id is a read-only property of type int It is shown here: public int Id { get; } A task is given an ID when it is created The ID values are unique, but unordered Therefore, the ID of a task begun before another might not be lower in value You can find the ID of the currently executing task by using the CurrentId property This is a read-only static property, which is declared like this: public static Nullable<int> CurrentID { get; } It returns the ID of the currently executing task or null if the invoking code is not a task The following program creates two tasks and shows which task is executing: