C# - Thread Semaphore

Limits the number of threads that can access a resource or pool of resources concurrently.


using System;

using System.Threading;

namespace Program

{

    class Demo

    {

        static Thread[] t = new Thread[5];

        static Semaphore semaphore = new Semaphore(2, 2);

        static void DoSomething()

        {

            Console.WriteLine("{0} = waiting", Thread.CurrentThread.Name);

            semaphore.WaitOne();

            Console.WriteLine("{0} begins!", Thread.CurrentThread.Name);

            Thread.Sleep(1000);

            Console.WriteLine("{0} releasing...", Thread.CurrentThread.Name);

            semaphore.Release();

        }

        static void Main(string[] args)

        {

            for (int j = 0; j < 5; j++)

            {

                t[j] = new Thread(DoSomething);

                t[j].Name = "thread number " + j;

                t[j].Start();

            }

            Console.Read();

        }

    }

}