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Alas, the thread scheduler that is, the portion of the operating system that schedules existing threads and preempts the running thread when its time slice expires takes some CPU time for its own chores. Moreover, the operating system consumes some memory to keep the context of each thread, be it active or temporarily suspended. For this reason, if too many threads are active at the same time, this scheduling activity can take a non-negligible amount of time and can degrade the overall performance, leaving less spare time to worker threads (the threads that do something useful). So you should never create more threads than strictly necessary, or you should use threads taken from the thread pool, as I explain at the end of this chapter. You might want to create additional threads to perform operations such as asynchronous file or database I/O, communication with a remote machine or a Web server, or low-pri ority background jobs. You make the most of multithreading when you allocate distinct threads to tasks that have different priorities or that take a lot of time to complete. Before opting for a multithreading application, you should consider available alternatives, such as using timers for scheduling recurring tasks, as I ll explain later in this chapter. The main problem with threads is that they can compete for shared resources, where a resource can be as simple as a variable or as complex as a database connection or a hardware device. You must synchronize access to such resources otherwise, you can get into trouble, for reasons that will be clear shortly. Visual Basic .NET provides the SyncLock construct to help you deal with these problems, and the runtime offers sev eral synchronization objects. The key to effective multithreading is learning how to use these features properly.

This version of the Draw method is very similar to the original, except that DrawString is now called twice, first drawing in red and then in yellow. In between the draw operations, the values of the X and Y properties of the position vector are increased by 4 using the following statements:

The System.Threading.Thread class offers all the methods and properties you need to create and manage threads. To create a new thread, you simply instantiate a new Thread object and then invoke its Start method. The Thread object s constructor requires one argument, a ThreadStart delegate object that points to the routine that runs when the thread starts. Such a routine must be a Sub without any arguments. The following Visual Basic application spawns a second thread that prints some mes sages to the console window:

Sub TestThread() Create a new thread, and define its starting point. Dim t As New Thread(New ThreadStart(AddressOf DoTheTask)) Run the new thread. t.Start() Print some messages to the Console window. For i As Integer = 1 to 10 Console.WriteLine( Msg #{0} from main thread", i) Wait for 0.2 second. Thread.Sleep(200) Next End Sub

A newsletter is a periodic publication containing information of interest to a speci c group for example, employees of a company or members of a club or other organization. Newsletter recipients are frequently subscribers you track in a mailing list, rather than people you don t know. Depending on the size of your subscription base and the amount and frequency of information in each newsletter, you might choose to deliver the content in a traditional printed format or in an electronic format, such as on a Web site or by e-mail.

Part III:

Sub DoTheTask() For i As Integer = 1 To 10 Console.WriteLine( Msg #{0} from secondary thread", i) Wait for 0.2 second. Thread.Sleep(200) Next End Sub

nowVector.X = nowVector.X + 4; nowVector.Y = nowVector.Y + 4;

The console window will contain intermixed messages from both the main and the secondary thread, evidence that they are running independently. The Start method is asynchronous, in the sense that it might return before the spawned thread has actually started its execution. A thread terminates when its main routine (DoTheTask, in this case) exits or when the thread is programmatically killed by a Thread.Abort method. The application as a whole terminates only when all its threads terminate. You can check how many threads an application has created by using the Process Viewer utility, which comes with Microsoft Visual Studio 6. (See Figure 12-1.) Interestingly, this utility shows that .NET applications might have additional threads for example, the thread that manages garbage collections and finalizers over which you apparently have no control.

Figure 12-1 The Process Viewer utility displays diagnostic information about processes and their threads.

The IComparable interface is all you need when your objects can be compared in only one way. Most real-world objects, however, can be compared and sorted on different fields or field combinations; in this case, you can use a variation of the Array.Sort method that takes an IComparer interface as its second argument. The IComparer interface exposes only one method, Compare, which receives two object references and returns -1, 0, or 1 depending on whether the first object is less than, equal to, or greater than the second object. A class that can be sorted on different field combinations might expose two or more nested classes that implement the IComparer interface, one class for each possible sort method. For example, you might want to sort the Person class on either the (LastName, FirstName) or (FirstName, LastName) field combination; these combinations corre spond to the ReverseName and CompleteName read-only properties in the code that follows. Here s a new version of the class that supports these features: