barcode generator c# source code Exploring the C# Library in C#.NET

Printer Denso QR Bar Code in C#.NET Exploring the C# Library

Exploring the C# Library
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Sample output from this program is shown next:
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Main thread starting Child #1 starting Child #2 starting Child #3 starting In Child #1, Count is 0 In Child #2, Count is 0 In Child #3, Count is 0 In Child #1, Count is 1 In Child #2, Count is 1 In Child #3, Count is 1 In Child #1, Count is 2 In Child #2, Count is 2 In Child #3, Count is 2 In Child #1, Count is 3 In Child #2, Count is 3 In Child #3, Count is 3 In Child #1, Count is 4 In Child #2, Count is 4 In Child #3, Count is 4 In Child #1, Count is 5 In Child #2, Count is 5 In Child #3, Count is 5 In Child #1, Count is 6 In Child #2, Count is 6 In Child #3, Count is 6 In Child #1, Count is 7 In Child #2, Count is 7 In Child #3, Count is 7 In Child #1, Count is 8 In Child #2, Count is 8 In Child #3, Count is 8 In Child #1, Count is 9 Child #1 terminating In Child #2, Count is 9 Child #2 terminating In Child #3, Count is 9 Child #3 terminating Main thread ending
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As you can see, once started, all three child threads share the CPU Again, because of differences among system configurations, operating systems, and other environmental factors, when you run the program, the output you see may differ slightly from that shown here
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Determining When a Thread Ends
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Often it is useful to know when a thread has ended In the preceding examples, this was accomplished by watching the Count variable hardly a satisfactory or generalizable solution Fortunately, Thread provides two means by which you can determine whether a thread has ended First, you can interrogate the read-only IsAlive property for the thread It is defined like this:
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Multithreaded Programming, Part One
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public bool IsAlive { get; } IsAlive returns true if the thread upon which it is called is still running It returns false otherwise To try IsAlive, substitute this version of MoreThreads for the one shown in the preceding program:
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// Use IsAlive to wait for threads to end class MoreThreads { static void Main() { ConsoleWriteLine("Main thread starting"); // Construct MyThread mt1 MyThread mt2 MyThread mt3 three = new = new = new threads MyThread("Child #1"); MyThread("Child #2"); MyThread("Child #3");
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PART II
do { ConsoleWrite(""); ThreadSleep(100); } while (mt1ThrdIsAlive && mt2ThrdIsAlive && mt3ThrdIsAlive); ConsoleWriteLine("Main thread ending"); } }
This version produces the same output as before The only difference is that it uses IsAlive to wait for the child threads to terminate Another way to wait for a thread to finish is to call Join( ) Its simplest form is shown here: public void Join( ) Join( ) waits until the thread on which it is called terminates Its name comes from the concept of the calling thread waiting until the specified thread joins it A ThreadStateException will be thrown if the thread has not been started Additional forms of Join( ) allow you to specify a maximum amount of time that you want to wait for the specified thread to terminate Here is a program that uses Join( ) to ensure that the main thread is the last to stop:
// Use Join() using System; using SystemThreading; class MyThread { public int Count; public Thread Thrd; public MyThread(string name) { Count = 0; Thrd = new Thread(thisRun); ThrdName = name; ThrdStart(); }
Part II:
Exploring the C# Library
// Entry point of thread void Run() { ConsoleWriteLine(ThrdName + " starting"); do { ThreadSleep(500); ConsoleWriteLine("In " + ThrdName + ", Count is " + Count); Count++; } while(Count < 10); ConsoleWriteLine(ThrdName + " terminating"); } } // Use Join() to wait for threads to end class JoinThreads { static void Main() { ConsoleWriteLine("Main thread starting"); // Construct MyThread mt1 MyThread mt2 MyThread mt3 three = new = new = new threads MyThread("Child #1"); MyThread("Child #2"); MyThread("Child #3");
mt1ThrdJoin(); ConsoleWriteLine("Child #1 joined"); mt2ThrdJoin(); ConsoleWriteLine("Child #2 joined"); mt3ThrdJoin(); ConsoleWriteLine("Child #3 joined"); ConsoleWriteLine("Main thread ending"); } }
Sample output from this program is shown here Remember when you try the program, your output may vary slightly
Main thread starting Child #1 starting Child #2 starting Child #3 starting In Child #1, Count is In Child #2, Count is In Child #3, Count is In Child #1, Count is In Child #2, Count is In Child #3, Count is In Child #1, Count is In Child #2, Count is In Child #3, Count is
0 0 0 1 1 1 2 2 2
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