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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.

4

Returns the provider s nickname. Returns true if cookie storage for role data is enabled. Specifies the name of the cookie used by the role manager to store the roles. It defaults to .ASPXROLES. Specifies the cookie path. Specifies an option for securing the roles cookie. Possible values are All, Clear, Hashed, and Encrypted. Indicates whether the cookie requires SSL. Indicates whether the cookie has a fixed expiration time or a sliding expiration. Returns the time, in minutes, after which the cookie will expire. Creates a role cookie that survives the current session. Indicates the domain of the role cookie. Indicates whether role management is enabled. Indicates the maximum number of roles that can be stored in a cookie for a user. Returns the current role provider. Returns a list of all supported role providers.

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:

ApplicationName CacheRolesInCookie CookieName CookiePath CookieProtectionValue CookieRequireSSL CookieSlidingExpiration CookieTimeout CreatePersistentCookie Domain Enabled MaxCachedResults Provider Providers

Some methods in the Roles class need to query continuously for the roles associated with a given user, so when possible, the roles for a given user are stored in an encrypted cookie. On each request, ASP.NET checks to see whether the cookie is present; if so, it decrypts the role ticket and attaches any role information to the User object. By default, the cookie is a session cookie and expires as soon as the user closes the browser. Note that the cookie is valid only if the request is for the current user. When you request role information for other users, the information is read from the data store using the configured role provider. Note Role management passes through the role manager HTTP module. The module is

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

responsible for adding the appropriate roles to the current identity object, such as the User object. The module listens for the AuthenticateRequest event and does its job.

Part III:

For its I/O activity, the role manager uses the provider model and a provider component. The role provider is a class that inherits the RoleProvider class. The schema of a role provider is not much different from that of a membership provider. Table 19-14 details the members of the RoleProvider class.

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

TABLE 19-14