using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

namespace ConsoleApplication1
{
class Program
    {
static Semaphore hSemaphore;
//static Thread[] hThread;
        static int source = 0;

static void Main(string[] args)
        {
            hSemaphore = new Semaphore(1, 3);

            Thread[] hThread = new Thread[4];
for (int i = 0; i < 4; i++)
            {
                hThread[i] = new Thread(new ThreadStart(Proc));
                hThread[i].Name = string.Format("线程{0}", i + 1);
                hThread[i].Start();
//Thread t = new Thread(new ParameterizedThreadStart(Proc));
//t.Start(i);
            }

//等待半秒直到所有线程都启动并获取信号量
//Thread.Sleep(5000);

for (int i = 0; i < hThread.Length; i++)
            {
                hThread[i].Join();
            }

//释放信号量
//hSemaphore.Release(5);

            Console.ReadKey();
        }

static void Proc()
        {
            Console.WriteLine("{0} 开始等待信号量, 请求资源", Thread.CurrentThread.Name);
            hSemaphore.WaitOne();

            Console.WriteLine("{0} 已经进入信号量, --使用资源--", Thread.CurrentThread.Name);

            source++;

int p = Interlocked.Add(ref source, 100);
            Thread.Sleep(1000 + p);

            Console.WriteLine("{0} 已释放信号量, 原信号量数目: {1}", Thread.CurrentThread.Name, hSemaphore.Release());
        }

    }
}