A synchronized shared buffer implementation



using System;
using System.Threading;

public class SynchronizedBuffer
{
   private int buffer = -1; 

   private int occupiedBufferCount = 0;  

   public int Buffer
   {      
      get
      { 
         Monitor.Enter( this );

         if ( occupiedBufferCount == 0 )
         {
            Console.WriteLine(Thread.CurrentThread.Name + " tries to read." );
            DisplayState( "Buffer empty. " +Thread.CurrentThread.Name + " waits." );
            Monitor.Wait( this );
         } 
         --occupiedBufferCount;    
                              
         DisplayState( Thread.CurrentThread.Name + " reads " + buffer );

         Monitor.Pulse( this );
         int bufferCopy = buffer;

         Monitor.Exit( this );

         return bufferCopy;
      }
      set
      {
         Monitor.Enter( this );
         if ( occupiedBufferCount == 1 )
         {
            Console.WriteLine(Thread.CurrentThread.Name + " tries to write." );
            DisplayState( "Buffer full. " + Thread.CurrentThread.Name + " waits." );
            Monitor.Wait( this );
         }
         buffer = value;

         ++occupiedBufferCount;

         DisplayState( Thread.CurrentThread.Name + " writes " + buffer );
         Monitor.Pulse( this );

         Monitor.Exit( this );
      } 
   }

   public void DisplayState( string operation )
   {
      Console.WriteLine( "{0,-35}{1,-9}{2}\n",operation, buffer, occupiedBufferCount );
   }

   static void Main( string[] args )
   {
      SynchronizedBuffer shared = new SynchronizedBuffer();
      Random random = new Random();

      Console.WriteLine( "{0,-35}{1,-9}{2}\n","Operation", "Buffer", "Occupied Count" );
      shared.DisplayState( "Initial state" );

      Producer producer = new Producer( shared, random );
      Consumer consumer = new Consumer( shared, random );

      Thread producerThread = new Thread( new ThreadStart( producer.Produce ) );
      producerThread.Name = "Producer";

      Thread consumerThread = new Thread( new ThreadStart( consumer.Consume ) );
      consumerThread.Name = "Consumer";

      producerThread.Start();
      consumerThread.Start();
   }
}

public class Consumer
{
   private SynchronizedBuffer sharedLocation;
   private Random randomSleepTime;

   public Consumer( SynchronizedBuffer shared, Random random )
   {
      sharedLocation = shared;
      randomSleepTime = random;
   }

   public void Consume()
   {
      int sum = 0;

      for ( int count = 1; count <= 10; count++ )
      {
         Thread.Sleep( randomSleepTime.Next( 1, 1001 ) );
         sum += sharedLocation.Buffer;
      }

      Console.WriteLine("{0} read values totaling: {1}.\nTerminating {0}.",Thread.CurrentThread.Name, sum );
   }
}

public class Producer 
{
   private SynchronizedBuffer sharedLocation;
   private Random randomSleepTime;

   public Producer( SynchronizedBuffer shared, Random random )
   {
      sharedLocation = shared;
      randomSleepTime = random;
   }
   public void Produce()
   {
      for ( int count = 1; count <= 10; count++ ) 
      {
         Thread.Sleep( randomSleepTime.Next( 1, 1001 ) );
         sharedLocation.Buffer = count; 
      }
      Console.WriteLine( "{0} done producing.\nTerminating {0}.",Thread.CurrentThread.Name );
   }
}

1.	illustrates the use of the Mutex object
2.	Use lock to synchronize access to an object
3.	Another way to use lock to synchronize access to an object
4.	Use Wait() and Pulse() to create a ticking clock
5.	Use MethodImplAttribute to synchronize a method
6.	My Main Class Async Call back
7.	MyMain Class Async Wait Timeout
8.	Threading Class Mutex
9.	Threading and Asynchronous Operations:Access Reordering and Volatile
10.	Asynchronous Calls:A Simple Example 1
11.	Asynchronous Calls:A Simple Example 2
12.	Asynchronous Calls:Return Values
13.	Asynchronous Calls:Waiting for Completion
14.	Asynchronous Calls:Waiting for Completion 2
15.	Data Protection and Synchronization:A Slightly Broken Example

A synchronized shared buffer implementation : Thread Sync « Thread « C# / C Sharp

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