.net qr code reader Thread Basics in .NET

Generation QR-Code in .NET Thread Basics

25 Thread Basics
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CLR s finalizer thread, discussed in 21, Automatic Memory Management (Garbage Collection), runs at the Time-Critical priority level . Therefore, as a managed developer, you really only get to use the five highlighted relative thread priorities listed in Table 25-1 . Important Today, most applications do not take advantage of thread priorities . However, in
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the world that I envision, where the CPUs are busy 100 percent of the time doing some kind of useful work, using thread priorities becomes critically important so that system responsiveness is unaffected . Unfortunately, end users have been trained to interpret a high-CPU usage number to mean that an application is out of control . In my new world, end users will need to be retrained to understand that high-CPU usage is a good thing that it actually means that the computer is aggressively processing helpful pieces of information for users . The real problem would be if all the CPUs are busy running threads that are priority level 8 and above, as this would mean that applications are having trouble responding to end user input . Perhaps a future version of Task Manager will take thread priority levels into account when reporting CPU usage; this would be much more helpful in diagnosing a troubled system .
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I should point out that the System.Diagnostics namespace contains a Process class and a ProcessThread class . These classes provide the Windows view of a process and thread, respectively . These classes are provided for developers wanting to write utility applications in managed code or for developers who are trying to instrument their code to help them debug it . In fact, this is why the classes are in the System.Diagnostics namespace . Applications need to be running with special security permissions to use these two classes . You would not be able to use these classes from a Silverlight application or an ASP .NET application, for example . On the other hand, applications can use the AppDomain and Thread classes, which expose the CLR s view of an AppDomain and thread . For the most part, special security permissions are not required to use these classes, although some operations are still considered privileged .
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Foreground Threads versus Background Threads
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The CLR considers every thread to be either a foreground thread or a background thread . When all the foreground threads in a process stop running, the CLR forcibly ends any background threads that are still running . These background threads are ended immediately; no exception is thrown . Therefore, you should use foreground threads to execute tasks that you really want to complete, like flushing data from a memory buffer out to disk . And you should use background threads for tasks that are not mission-critical, like recalculating spreadsheet cells or indexing records, because this work can continue again when the application restarts, and there is no need to force the application to stay active if the user wants to terminate it .
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Part V
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Threading
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The CLR needed to provide this concept of foreground and background threads to better support AppDomains . You see, each AppDomain could be running a separate application and each of these applications would have its own foreground thread . If one application exits, causing its foreground thread to terminate, then the CLR still needs to stay up and running so that other applications continue to run . After all the applications exit and all their foreground threads terminate, the whole process can be destroyed . The following code demonstrates the difference between foreground and background threads:
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using System; using System.Threading; public static class Program { public static void Main() { // Create a new thread (defaults to foreground) Thread t = new Thread(Worker); // Make the thread a background thread t.IsBackground = true; t.Start(); // Start the thread // If t is a foreground thread, the application won't die for about 10 seconds // If t is a background thread, the application dies immediately Console.WriteLine("Returning from Main"); } private static void Worker() { Thread.Sleep(10000); // Simulate doing 10 seconds of work // The line below only gets displayed if this code is executed by a foreground thread Console.WriteLine("Returning from Worker"); } }
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It is possible to change a thread from foreground to background and vice versa at any time during its lifetime . An application s primary thread and any threads explicitly created by constructing a Thread object default to being foreground threads . On the other hand, thread pool threads default to being background threads . Also, any threads created by native code that enter the managed execution environment are marked as background threads . Important Try to avoid using foreground threads as much as possible . I was brought into a
consulting job once where an application just wouldn t terminate . After I spent several hours researching the problem, it turned out that a UI component was explicitly creating a foreground thread (the default), and that was why the process wouldn t terminate . We changed the component to use the thread pool to fix the problem, and efficiency improved as well .
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