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References in .NET Attach UPC-A in .NET References




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References using barcode generation for visual studio .net control to generate, create upc barcodes image in visual studio .net applications. Bar code to 2D Code [Sel-01] Sells, Chris, UCC - 12 for .NET "Managed Extensions Bring .NET CLR Support to C++," MSDN Magazine, July 2001.

msdn.microsoft.com/msdnmag/issues/01/07/vsnet/vsnet.

asp [Ras-01] Restrepo, Tomas, "Introducing Managed Code to C++," Visual Systems Journal, February 2001. www.vsj.

co.uk/archive/feb2001/hoc1-0102.asp [Pla-01] Platt, David, "Get Ready for Microsoft .

NET by Using Wrappers to Interact with COM-Based Apps," MSDN Magazine, August 2001. msdn.microsoft.

com/msdnmag/issues/01/08/Interop/Interop.asp [Noy-01] Noyes, Brian, "Exploit COM Interop in .NET," Visual Basic Programmer"s Journal, June 2001.

www.devx.com/premier/mgznarch/vcdj/2001/06jun01/ce0106/ce0601-1.

asp. 8. Concurrency Under Windows, and mos UPC-A Supplement 2 for .NET t other modern OSs, a process can execute multiple threads concurrently, each of which carry out a specific task. The .

NET Framework supports developing multithreaded applications in two ways by supporting the creation and use of threads and by providing a mechanism to make asynchronous calls. In this chapter, we examine both these techniques in detail. We also look at various issues involved with multithread programming and the support provided by the .

NET Framework in developing classes that are safe from concurrent access.. Multithread Programming First, a little backgr UCC - 12 for .NET ound on processes and threads as defined by the OS is in order. A thread is the basic unit of execution on the Win32 platform, to which the OS allocates processor time.

A process represents a running application that consists of a private virtual address space, code, data, and other OS resources such as files, pipes, and synchronization objects that are visible to the process. A process also contains one or more threads that run in the context of the process. A thread can execute just one task at a time.

To perform multiple tasks concurrently, a process can create multiple threads. Even though only one thread can execute at any time,[1] the Windows OS preemptively switches execution from one thread to another. The switching is so fast that all the threads appear to run at the same time.

. More specifically, thread execution is processor based. A multiprocessor machine can have multiple threads executing simultaneously. All threads within a p rocess share the virtual address space and global variables of that process. However, each thread has its own stack. Therefore, when a thread is executing, any program variables that are created on the stack are local to the thread.

A thread is uniquely identified by a numeric value. This numeric identifier is unique only within a process. In other words, two processes can each have a thread that has the same thread ID.

Threads are scheduled for execution based on their priority. Thread priorities specify the relative priority of one thread over another and can be adjusted programmatically. The OS can also adjust the thread priority dynamically.

Often, it is necessary to maintain thread-specific data. However, a static or global variable cannot be used for this purpose because it has the same value across all the threads. To address this problem, the OS provides a feature called thread local storage (TLS).

With TLS, it is possible to create a unique copy of a variable for each thread within a process. This information is in the context of the unmanaged world. Things are slightly different in the managed environment of .

NET. For example, a global variable is global only within an application domain, not at the process level. Also, a managed thread can be assigned a name, which is useful for debugging purposes.

. The .NET SDK provides UPC-A Supplement 2 for .NET classes that deal with thread creation, manipulation, and synchronization.

The SDK also provides comprehensive documentation on their usage. With this brief background information, let"s develop a simple application that demonstrates the use of the .NET classes in creating and manipulating threads.

As we go along in the chapter, we will pick up any other thread-related information that we need.. A Simple Example The following code exc upc a for .NET erpt creates a thread and displays the thread identifier from both the main thread and the spawned thread:. // Project Threads/Sim pleThread using System; using System.Threading; public class Foo { public static void MyThreadProc() { Console.WriteLine("I am in thread: {0}", AppDomain.

GetCurrentThreadId()); } } class MyApp { public static void Main() { Console.WriteLine("Main thread: {0}", AppDomain.GetCurrentThreadId()); Thread t = new Thread( new ThreadStart(Foo.

MyThreadProc)); t.Start(); // start the thread t.Join(); } }.

Namespace System.Threa VS .NET UPC-A Supplement 2 ding provides classes and interfaces that deal with multithreaded programming.

The class Thread encapsulates the creation and manipulation of a managed thread. This class has a public constructor that takes a delegate ThreadStart as a parameter. Here is the definition of the delegate:.

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