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To begin, set a reference to the System.Windows.Forms.dll assembly (and import the System.Windows.Forms namespace) and display a message within Main() using MessageBox.Show() (you ll see the point of doing so once you run the program). Here is the complete implementation of Main(): static void Main(string[] args) { Console.WriteLine("***** The Amazing Thread App *****\n"); Console.Write("Do you want [1] or [2] threads "); string threadCount = Console.ReadLine(); // Name the current thread. Thread primaryThread = Thread.CurrentThread; primaryThread.Name = "Primary"; // Display Thread info. Console.WriteLine("-> {0} is executing Main()", Thread.CurrentThread.Name); // Make worker class. Printer p = new Printer(); switch(threadCount) { case "2": // Now make the thread. Thread backgroundThread = new Thread(new ThreadStart(p.PrintNumbers)); backgroundThread.Name = "Secondary"; backgroundThread.Start(); break; case "1": p.PrintNumbers(); break; default: Console.WriteLine("I don't know what you want...you get 1 thread."); goto case "1"; } // Do some additional work. MessageBox.Show("I'm busy!", "Work on main thread..."); Console.ReadLine(); } Now, if you run this program with a single thread, you will find that the final message box will not display the message until the entire sequence of numbers has printed to the console. As you are explicitly pausing for approximately two seconds after each number is printed, this will result in a lessthan-stellar end-user experience. However, if you select two threads, the message box displays instantly, given that a unique Thread object is responsible for printing out the numbers to the console (see Figure 19-2).

0 0 0 0 0

Recall that the ThreadStart delegate can point only to methods that return void and take no arguments. While this may fit the bill in many cases, if you wish to pass data to the method executing on the secondary thread, you will need to make use of the ParameterizedThreadStart delegate type. To illustrate, let s re-create the logic of the AsyncCallbackDelegate project created earlier in this chapter, this time making use of the ParameterizedThreadStart delegate type. To begin, create a new Console Application named AddWithThreads and import the System.Threading namespace. Now, given that ParameterizedThreadStart can point to any method taking a System.Object parameter, you will create a custom type containing the numbers to be added: class AddParams { public int a, b; public AddParams(int numb1, int numb2) { a = numb1; b = numb2; } } Next, create a static method in the Program class that will take an AddParams parameter and print out the sum of the two numbers involved: static void Add(object data) { if (data is AddParams) { Console.WriteLine("ID of thread in Add(): {0}",

Thread.CurrentThread.ManagedThreadId); AddParams ap = (AddParams)data; Console.WriteLine("{0} + {1} is {2}", ap.a, ap.b, ap.a + ap.b); } } The code within Main() is straightforward. Simply use ParameterizedThreadStart rather than ThreadStart: static void Main(string[] args) { Console.WriteLine("***** Adding with Thread objects *****"); Console.WriteLine("ID of thread in Main(): {0}", Thread.CurrentThread.ManagedThreadId); // Make an AddParams object to pass to the secondary thread. AddParams ap = new AddParams(10, 10); Thread t = new Thread(new ParameterizedThreadStart(Add)); t.Start(ap); // Force a wait to let other thread finish. Thread.Sleep(5); Console.ReadLine(); }

The {filter_format}.format of the signature Timestamp for when user was created Timestamp for previous time user accessed the site Timestamp for user s last login Whether the user is active (1) or blocked (0) User s time zone User s default language Foreign key: {file_managed}. fid of user s picture E-mail address used for initial account creation A serialized array of name/value pairs that are related to the user; any form values posted during user edit are stored and loaded into the $user object during user_load(). Use of this field is discouraged, and it will likely disappear in a future version of Drupal.

In these first few examples, you have made use of a few crude ways to inform the primary thread to wait until the secondary thread has completed. During your examination of asynchronous delegates you used a simple bool variable as a toggle; however, this is not a recommended solution, as both threads can access the same point of data, and this can lead to data corruption. A safer, but still undesirable alternative is to call Thread.Sleep() for a fixed amount of time. The problem here is you don t want to wait longer than necessary. One simple, and thread safe way to force a thread to wait until another is completed is to use the AutoResetEvent class. In the thread which needs to wait (such as a Main() method), create an instance of this class, and pass in false to the constructor in order to signify you have not yet been notified. Then, at the point at which you are willing to wait, call the WaitOne() method. Here is the update to Program class which will do this very thing using a static level AutoResetEvent member variable: class Program { private static AutoResetEvent waitHandle = new AutoResetEvent(false); static void Main(string[] args) { Console.WriteLine("***** Adding with Thread objects *****"); Console.WriteLine("ID of thread in Main(): {0}", Thread.CurrentThread.ManagedThreadId);