barcode printing using c#.net Using the Main Thread in Visual C#

Drawing QR in Visual C# Using the Main Thread

Using the Main Thread
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As mentioned at the start of this chapter, all C# programs have at least one thread of execution, called the main thread, which is given to the program automatically when it begins running The main thread can be handled just like all other threads To access the main thread, you must obtain a Thread object that refers to it You do this through the CurrentThread property, which is a member of Thread Its general form is shown here: public static Thread CurrentThread{ get; } This property returns a reference to the thread in which it is used Therefore, if you use CurrentThread while execution is inside the main thread, you will obtain a reference to the main thread Once you have this reference, you can control the main thread just like any other thread The following program obtains a reference to the main thread and then gets and sets the main thread s name and priority:
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// Control the main thread using System; using SystemThreading; class UseMain { static void Main() { Thread Thrd; // Get the main thread Thrd = ThreadCurrentThread;
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Part II:
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Exploring the C# Library
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// Display main thread s name if(ThrdName == null) ConsoleWriteLine("Main thread has no name"); else ConsoleWriteLine("Main thread is called: " + ThrdName); // Display main thread s priority ConsoleWriteLine("Priority: " + ThrdPriority); ConsoleWriteLine(); // Set the name and priority ConsoleWriteLine("Setting name and priority\n"); ThrdName = "Main Thread"; ThrdPriority = ThreadPriorityAboveNormal; ConsoleWriteLine("Main thread is now called: " + ThrdName); ConsoleWriteLine("Priority is now: " + ThrdPriority); } }
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The output from the program is shown here:
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Main thread has no name Priority: Normal Setting name and priority Main thread is now called: Main Thread Priority is now: AboveNormal
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One word of caution: You need to be careful about what operations you perform on the main thread For example, if you add this call to Join( ) to the end of Main( ),
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ThrdJoin();
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the program will never terminate because it will be waiting for the main thread to end!
Additional Multithreading Features Added by NET 40
Version 40 of the NET Framework adds new multithreading features that you might find useful The most important is the new cancellation system The cancellation system supports a mechanism by which a thread can be cancelled easily in a well-defined, structured way It is based on the concept of a cancellation token, which is used to specify the cancellation state of a thread Cancellation tokens are supported by the CancellationTokenSource class and the CancellationToken structure Because the cancellation system is fully integrated into the new Task Parallel Library, it is described in 24, where the TPL is discussed SystemThreading adds a structure called SpinWait It provides the methods SpinOnce( ) and SpinUntil( ) that give you greater control over spin waiting In general, on single-
23:
Multithreaded Programming, Part One
processor systems, SpinWait will yield On multiprocessor systems, it will use a loop Another spin-related element is the SpinLock, which uses a loop to wait until a lock is available The Thread class adds a method called Yield( ) that simply yields the remainder of a thread s timeslice It is shown here: public static bool Yield( ) It returns true if a context switch occurred, and false otherwise A context switch will not occur if there is not another thread that is ready to run
Multithreading Tips
The key to effectively utilizing multithreading is to think concurrently rather than serially For example, when you have two subsystems within a program that can execute concurrently, consider making them into individual threads A word of caution is in order, however If you create too many threads, you can actually degrade your program s performance rather than enhance it Remember, there is some overhead associated with context switching If you create too many threads, more CPU time will be spent changing contexts than in executing your program! Finally, for new code consider using the Task Parallel Library to accomplish multithreading
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