qr code scanner windows 8.1 c# Multithreaded Programming, Part One in Visual C#.NET

Encoder QR Code in Visual C#.NET Multithreaded Programming, Part One

Multithreaded Programming, Part One
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important Because support for multithreading is built in, C# makes it easier to construct high-performance, multithreaded programs than do some other languages The classes that support multithreaded programming are defined in the SystemThreading namespace Thus, you will usually include this statement at the start of any multithreaded program:
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using SystemThreading;
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The Thread Class
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The multithreading system is built upon the Thread class, which encapsulates a thread of execution The Thread class is sealed, which means that it cannot be inherited Thread defines several methods and properties that help manage threads Throughout this chapter, several of its most commonly used members will be examined
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PART II
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Creating and Starting a Thread
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There are a number of ways to create and start a thread This section describes the basic mechanism Various options are described later in this chapter To create a thread, instantiate an object of type Thread, which is a class defined in SystemThreading The simplest Thread constructor is shown here: public Thread(ThreadStart start) Here, start specifies the method that will be called to begin execution of the thread In other words, it specifies the thread s entry point ThreadStart is a delegate defined by the NET Framework as shown here: public delegate void ThreadStart( ) Thus, your entry point method must have a void return type and take no arguments Once created, the new thread will not start running until you call its Start( ) method, which is defined by Thread The Start( ) method has two forms The one used here is public void Start( ) Once started, the thread will run until the entry point method returns Thus, when the thread s entry point method returns, the thread automatically stops If you try to call Start( ) on a thread that has already been started, a ThreadStateException will be thrown Here is an example that creates a new thread and starts it running:
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// Create a thread of execution using System; using SystemThreading; class MyThread { public int Count; string thrdName; public MyThread(string name) { Count = 0; thrdName = name; }
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Part II:
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Exploring the C# Library
// Entry point of thread public void Run() { ConsoleWriteLine(thrdName + " starting"); do { ThreadSleep(500); ConsoleWriteLine("In " + thrdName + ", Count is " + Count); Count++; } while(Count < 10); ConsoleWriteLine(thrdName + " terminating"); } } class MultiThread { static void Main() { ConsoleWriteLine("Main thread starting"); // First, construct a MyThread object MyThread mt = new MyThread("Child #1"); // Next, construct a thread from that object Thread newThrd = new Thread(mtRun); // Finally, start execution of the thread newThrdStart(); do { ConsoleWrite(""); ThreadSleep(100); } while (mtCount != 10); ConsoleWriteLine("Main thread ending"); } }
Let s look closely at this program MyThread defines a class that will be used to create a second thread of execution Inside its Run( ) method, a loop is established that counts from 0 to 9 Notice the call to Sleep( ), which is a static method defined by Thread The Sleep( ) method causes the thread from which it is called to suspend execution for the specified period of milliseconds The form used by the program is shown here: public static void Sleep(int millisecondsTimeout) The number of milliseconds to suspend is specified in millisecondsTimeout If millisecondsTimeout is zero, the calling thread is suspended only to allow a waiting thread to execute Inside Main( ), a new Thread object is created by the following sequence of statements:
// First, construct a MyThread object MyThread mt = new MyThread("Child #1"); // Next, construct a thread from that object Thread newThrd = new Thread(mtRun);
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Multithreaded Programming, Part One
// Finally, start execution of the thread newThrdStart();
As the comments suggest, first an object of MyThread is created This object is then used to construct a Thread object by passing the mtRun( ) method as the entry point Finally, execution of the new thread is started by calling Start( ) This causes mtRun( ) to begin executing in its own thread After calling Start( ), execution of the main thread returns to Main( ), and it enters Main( ) s do loop Both threads continue running, sharing the CPU, until their loops finish The output produced by this program is as follows (The precise output that you see may vary slightly because of differences in your execution environment, operating system, and task load)
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