Question

Looking for some sample code (C#) for a simple thread pool implementation.

I found one on codeproject, but the codebase was just huge and I don’t need all that functionality.

This is more for educational purposes anyways.

Answer 1

There is no need to implement your own, since it is not very hard to use the existing .NET implementation.

From ThreadPool Documentation:

using System; using System.Threading;  public class Fibonacci {     public Fibonacci(int n, ManualResetEvent doneEvent)     {         _n = n;         _doneEvent = doneEvent;     }      // Wrapper method for use with thread pool.     public void ThreadPoolCallback(Object threadContext)     {         int threadIndex = (int)threadContext;         Console.WriteLine('thread {0} started...', threadIndex);         _fibOfN = Calculate(_n);         Console.WriteLine('thread {0} result calculated...', threadIndex);         _doneEvent.Set();     }      // Recursive method that calculates the Nth Fibonacci number.     public int Calculate(int n)     {         if (n <= 1)         {             return n;         }          return Calculate(n - 1) + Calculate(n - 2);     }      public int N { get { return _n; } }     private int _n;      public int FibOfN { get { return _fibOfN; } }     private int _fibOfN;      private ManualResetEvent _doneEvent; }  public class ThreadPoolExample {     static void Main()     {         const int FibonacciCalculations = 10;          // One event is used for each Fibonacci object         ManualResetEvent[] doneEvents = new ManualResetEvent[FibonacciCalculations];         Fibonacci[] fibArray = new Fibonacci[FibonacciCalculations];         Random r = new Random();          // Configure and launch threads using ThreadPool:         Console.WriteLine('launching {0} tasks...', FibonacciCalculations);         for (int i = 0; i < FibonacciCalculations; i++)         {             doneEvents[i] = new ManualResetEvent(false);             Fibonacci f = new Fibonacci(r.Next(20,40), doneEvents[i]);             fibArray[i] = f;             ThreadPool.QueueUserWorkItem(f.ThreadPoolCallback, i);         }          // Wait for all threads in pool to calculation...         WaitHandle.WaitAll(doneEvents);         Console.WriteLine('All calculations are complete.');          // Display the results...         for (int i= 0; i<FibonacciCalculations; i++)         {             Fibonacci f = fibArray[i];             Console.WriteLine('Fibonacci({0}) = {1}', f.N, f.FibOfN);         }     } }