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All the multithreaded sample applications you have written over the course of this chapter have been thread-safe, given that only a single Thread object was executing the method in question. While some of your applications may be this simplistic in nature, a good deal of your multithreaded applications may contain numerous secondary threads. Given that all threads in an AppDomain have concurrent access to the shared data of the application, imagine what might happen if multiple threads were accessing the same point of data. As the thread scheduler will force threads to suspend their work seemingly at random, what if Thread A is kicked out of the way before it has fully completed its work Thread B is now reading unstable data. To illustrate the problem of concurrency, let s build another VB 2005 console application named MultiThreadedPrinting. This application will once again make use of the Printer class created previously, but this time the PrintNumbers() method will force the current thread to pause for a randomly generated amount of time: Public Class Printer Public Sub PrintNumbers() Console.WriteLine("-> {0} is executing PrintNumbers()", _ Thread.CurrentThread.Name) Console.Write("Your numbers: ") For i As Integer = 0 To 10 Dim r As Random = New Random() Thread.Sleep(100 * r.Next(5)) Console.Write(i & ", ") Next Console.WriteLine() End Sub End Class The Main() method is responsible for creating an array of eleven (uniquely named) Thread objects, each of which is making calls on the same instance of the Printer object:

The first minor hurdle for universal app development is orientation. With the iPhone s small screen, providing an efficient user interface design often requires a dedicated orientation, such as a portrait-only app. That s perfectly acceptable on the iPhone, but the iPad s larger display allows more of your interface elements to be consolidated into

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Module Program Sub Main() Console.WriteLine("***** Synchronizing Threads *****") Console.WriteLine() Dim p As Printer = New Printer() ' Make 11 threads that are all pointing to the same ' method on the same object. Dim threads(10) As Thread For i As Integer = 0 To 10 threads(i) = New Thread(AddressOf p.PrintNumbers) threads(i).Name = String.Format("Worker thread #{0}", i) Next ' Now start each one. For Each t As Thread In threads t.Start() Next Console.ReadLine() End Sub End Module Before looking at some test runs, let s recap the problem. The primary thread within this AppDomain begins life by spawning 11 secondary worker threads. Each worker thread is told to make calls on the PrintNumbers() method on the same Printer instance. Given that you have taken no precautions to lock down this object s shared resources (the console), there is a good chance that the current thread will be kicked out of the way before the PrintNumbers() method is able to print out the complete results. Because you don t know exactly when (or if) this might happen, you are bound to get unpredictable results. For example, you might find the output shown in Figure 16-8.

and built using web service standards. You can use BPEL to define and manage a long-running business process. BPEL is an orchestration language and is used for abstracting the collaboration and sequencing logic from various web services into a formal process definition that is based on XML, Web Services Description Language (WSDL), and XML Schema. BPEL is also known as BPEL4WS or WSBPEL.

Now run the application a few more times. Figure 16-9 shows another possibility (your results will obviously differ).

There are clearly some problems here. As each thread is telling the Printer to print out the numerical data, the thread scheduler is happily swapping threads in the background. The result is inconsistent output. What we need is a way to programmatically enforce synchronized access to the shared resources. As you would guess, the System.Threading namespace provides a number of synchronization-centric types. The VB 2005 programming language also provides a particular keyword for the very task of synchronizing shared data in multithreaded applications.

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