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// Demonstrate the Id and CurrentId properties using System; using SystemThreading; using SystemThreadingTasks; class DemoTask { // A method to be run as a task static void MyTask() { ConsoleWriteLine("MyTask() #" + TaskCurrentId + " starting"); for(int count = 0; count < 10; count++) { ThreadSleep(500); ConsoleWriteLine("In MyTask() #" + TaskCurrentId + ", count is " + count ); }

Part II:

ConsoleWriteLine("MyTask #" + TaskCurrentId + " terminating"); } static void Main() { ConsoleWriteLine("Main thread starting"); // Construct two tasks Task tsk = new Task(MyTask); Task tsk2 = new Task(MyTask); // Run the tasks tskStart(); tsk2Start(); ConsoleWriteLine("Task ID for tsk is " + tskId); ConsoleWriteLine("Task ID for tsk2 is " + tsk2Id); // Keep Main() alive until the other tasks finish for(int i = 0; i < 60; i++) { ConsoleWrite(""); ThreadSleep(100); } ConsoleWriteLine("Main thread ending"); } }

g (x) = Cos x is a one-to-one function It takes on all the values in the interval [ 1, 1] Thus Cos : [0, ] [ 1, 1] is one-to-one and onto; therefore it possesses an inverse We reflect the graph of Cos x in the line y = x to obtain the graph of the 1 function Cos The result is shown in Figure 618

The output is shown here:

After scrutinizing last months sales reports, the reasons for the downturn remain unclear Even after considering events such as the blizzard in the upper Midwest and the President s Day holiday, there seems to be no de nitive reason why sales are down What do you think is the problem What should we do differently Please E-mail me your ideas by Tuesday, and I ll present them at the next sales meeting (Five sentences totaling sixty-nine words [13 + 28 + 7 + 5 + 16 = 69] average just under fourteen words per sentence)

Main thread starting Task ID for tsk is 1 Task ID for tsk2 is 2 MyTask() #1 starting MyTask() #2 starting In MyTask() #1, count is 0 In MyTask() #2, count is 0 In MyTask() #2, count is 1 In MyTask() #1, count is 1 In MyTask() #1, count is 2 In MyTask() #2, count is 2 In MyTask() #2, count is 3 In MyTask() #1, count is 3 In MyTask() #1, count is 4 In MyTask() #2, count is 4 In MyTask() #1, count is 5 In MyTask() #2, count is 5 In MyTask() #2, count is 6 In MyTask() #1, count is 6 In MyTask() #2, count is 7 In MyTask() #1, count is 7 In MyTask() #1, count is 8 In MyTask() #2, count is 8

24:

We have Sin 1 3 2 , 3

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

In MyTask() #1, count is 9 MyTask #1 terminating In MyTask() #2, count is 9 MyTask #2 terminating Main thread ending

In the preceding examples, the Main( ) thread ended last because the calls to ThreadSleep( ) ensured this outcome, but this is not a satisfactory approach The best way to wait for a task to end is to use one of the wait methods that Task provides The simplest one is called Wait( ), and it pauses execution of the calling thread until the invoking task completes Here is its most straightforward form: public void Wait( ) This method can throw two exceptions The first is ObjectDisposedException It is thrown if the task has been released via a call to Dispose( ) The second is AggregateException It is thrown when a task throws an exception or is cancelled In general, you will want to watch for and handle this exception Because a task might produce more than one exception (if it has child tasks, for example), they are aggregated into a single exception of type AggregateException You can then examine the inner exception(s) associated with this exception to determine what happened For now, the following examples will simply let any task-based exceptions be handled by the runtime The following reworked version of the preceding program shows Wait( ) in action It is used inside Main( ) to suspend execution until both tsk and tsk2 finish