barcode printing using c#.net Multithreaded Programming, Part One in Visual C#

Painting QR in Visual C# Multithreaded Programming, Part One

Multithreaded Programming, Part One
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// Signal the event mreSet(); } } class ManualEventDemo { static void Main() { ManualResetEvent evtObj = new ManualResetEvent(false); MyThread mt1 = new MyThread("Event Thread 1", evtObj); ConsoleWriteLine("Main thread waiting for event");
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PART II
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// Wait for signaled event evtObjWaitOne(); ConsoleWriteLine("Main thread received first event");
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// Reset the event evtObjReset();
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mt1 = new MyThread("Event Thread 2", evtObj); // Wait for signaled event evtObjWaitOne(); ConsoleWriteLine("Main thread received second event"); } }
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The output is shown here (The actual output you see may vary slightly)
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Inside thread Event Thread 1 Event Thread 1 Main thread waiting for event Event Thread 1 Event Thread 1 Event Thread 1 Event Thread 1 Event Thread 1 Done! Main thread received first event Inside thread Event Thread 2 Event Thread 2 Event Thread 2 Event Thread 2 Event Thread 2 Event Thread 2 Event Thread 2 Done! Main thread received second event
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First, notice that MyThread is passed a ManualResetEvent in its constructor When MyThread s Run( ) method finishes, it calls Set( ) on that event object, which puts the
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Part II:
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Exploring the C# Library
event object into a signaled state Inside Main( ), a ManualResetEvent called evtObj is created with an initially unsignaled state Then, a MyThread instance is created and passed evtObj Next, the main thread waits on the event object Because the initial state of evtObj is not signaled, this causes the main thread to wait until the instance of MyThread calls Set( ), which puts evtObj into a signaled state This allows the main thread to run again Then the event is reset and the process is repeated for the second thread Without the use of the event object, all threads would have run simultaneously and their output would have been jumbled To verify this, try commenting out the call to WaitOne( ) inside Main( ) In the preceding program, if an AutoResetEvent object rather than a ManualResetEvent object were used, then the call to Reset( ) in Main( ) would not be necessary The reason is that the event is automatically set to a non-signaled state when a thread waiting on the event is resumed To try this, simply change all references to ManualResetEvent to AutoResetEvent and remove the calls to Reset( ) This version will execute the same as before
The Interlocked Class
One other class that is related to synchronization is Interlocked This class offers an alternative to the other synchronization features when all you need to do is change the value of a shared variable The methods provided by Interlocked guarantee that their operation is performed as a single, uninterruptable operation Thus, no other synchronization is needed Interlocked provides static methods that add two integers, increment an integer, decrement an integer, compare and set an object, exchange objects, and obtain a 64-bit value All of these operations take place without interruption The following program demonstrates two Interlocked methods: Increment( ) and Decrement( ) Here are the forms of these methods that will be used: public static int Increment(ref int location) public static int Decrement(ref int location) Here, location is the variable to be incremented or decremented
// Use Interlocked operations using System; using SystemThreading; // A shared resource class SharedRes { public static int Count = 0; } // This thread increments SharedResCount class IncThread { public Thread Thrd; public IncThread(string name) { Thrd = new Thread(thisRun); ThrdName = name;
23:
Multithreaded Programming, Part One
ThrdStart(); } // Entry point of thread void Run() { for(int i=0; i<5; i++) { InterlockedIncrement(ref SharedResCount); ConsoleWriteLine(ThrdName + " Count is " + SharedResCount); } } }
PART II
// This thread decrements SharedResCount class DecThread { public Thread Thrd; public DecThread(string name) { Thrd = new Thread(thisRun); ThrdName = name; ThrdStart(); } // Entry point of thread void Run() { for(int i=0; i<5; i++) { InterlockedDecrement(ref SharedResCount); ConsoleWriteLine(ThrdName + " Count is " + SharedResCount); } } } class InterlockedDemo { static void Main() { // Construct two threads IncThread mt1 = new IncThread("Increment Thread"); DecThread mt2 = new DecThread("Decrement Thread"); mt1ThrdJoin(); mt2ThrdJoin(); } }
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