lock(expression表达式) statement_block

Monitor.Enter(obj);
(expression)
Monitor.Exit(obj);

Mutex mutex = new Mutex();
mutex.WaitOne();
(expression)
mutex.ReleaseMutex();

using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Threading; 
namespace TestThread 
{ 
  class Program 
  { 
    private static object lockObject = new object(); 
    private static object lockObject2 = new object(); 
    private static int iGetHBnum = 0; 
    private static int iPutHBnum = 0; 
    private static int count21 = 0; 
    private static int count22 = 0; 
    private static int count23 = 0; 
    private static int count11 = 0; 
    private static int count12 = 0; 
    static void Main(string[] args) 
    { 
      Console.WriteLine("主线程运行,线程ID：" + Thread.CurrentThread.ManagedThreadId.ToString()); 
      Thread chushi1 = new Thread(PutHB); 
      chushi1.Priority = ThreadPriority.AboveNormal; 
      chushi1.Name = "11"; 
      chushi1.Start(); 
      Thread chushi2 = new Thread(PutHB); 
      chushi2.Priority = ThreadPriority.Normal; 
      chushi2.Name = "12"; 
      chushi2.Start();     
 
      Thread Consume21 = new Thread(GetHB); 
      Consume21.Priority = ThreadPriority.Normal; 
      Consume21.Name = "21"; 
      Consume21.Start(); 
      Thread Consume22 = new Thread(GetHB); 
      Consume22.Priority = ThreadPriority.Normal; 
      Consume22.Name = "22"; 
      Consume22.Start(); 
      Thread Consume23 = new Thread(GetHB); 
      Consume23.Priority = ThreadPriority.Normal; 
      Consume23.Name = "23"; 
      Consume23.Start(); 
      Console.ReadKey(); 
    } 
    public static void PutHB() 
    { 
      string strID = Thread.CurrentThread.Name.ToString(); 
      Console.WriteLine("{0}厨师开始制作汉堡,,,", strID); 
      while (true) 
      { 
        if (iPutHBnum >= 6) 
        { 
          Console.WriteLine("厨师{0},最多放6个汉堡,请让销售员取再放!", strID); 
          Thread.Sleep(1000); 
        } 
        else 
        {    
          if (iGetHBnum >= 70 ||count11 + count12 >= 70) 
          { 
            if (strID == "11") 
            { 
              Console.WriteLine("厨师{0},在货架放共放{1}汉堡！", strID, count11); 
            } 
            else if (strID == "12") 
            { 
              Console.WriteLine("厨师{0},在货架放共放{1}汉堡！", strID, count12); 
            } 
            break; 
          } 
          lock (lockObject) 
          { 
            iPutHBnum++; 
          } 
          if (strID == "11") 
          { 
            count11++; 
            Console.WriteLine("厨师{0},在货架放已放{1}汉堡! 现在货架有{2}汉堡！", strID,count11, iPutHBnum); 
          } 
          else if (strID == "12") 
          { 
            count12++; 
            Console.WriteLine("厨师{0},在货架放已放{1}汉堡! 现在货架有{2}汉堡！", strID, count12, iPutHBnum); 
          } 
        } 
      } 
    } 
    public static void GetHB() 
    { 
      string strID = Thread.CurrentThread.Name.ToString(); 
      Console.WriteLine("{0}销售员取汉堡,,,", strID); 
        while (true) 
        {  
          if (iPutHBnum <= 0) 
          { 
            Thread.Sleep(1000); 
            Console.WriteLine("{0}货架台已0个汉堡，请等待厨师制作！", strID);
          }
          else
          {
            lock (lockObject2)
            {
              iGetHBnum++;
              iPutHBnum--;
            }
            if (strID == "23")
            {
              count23++;
              Console.WriteLine("23号销售员已销售---{0}!",count23); 
              Thread.Sleep(3000); 
            }
            else if (strID == "22") 
            { 
              count22++; 
              Console.WriteLine("22号销售员已销售---{0}!", count22); 
              Thread.Sleep(2000); 
            } 
            else if (strID == "21") 
            { 
              count21++; 
              Console.WriteLine("21号销售员已销售---{0}!", count21); 
              Thread.Sleep(1000); 
            } 
          } 
          if (iGetHBnum >= 70) 
          { 
            Console.WriteLine("销售完!"); 
            if (strID == "23") 
            { 
              Console.WriteLine("23号销售员销售总数：{0}", count23); 
            } 
            else if (strID == "22") 
            { 
              Console.WriteLine("22号销售员销售总数：{0}", count22); 
            } 
            else if (strID == "21") 
            { 
              Console.WriteLine("21号销售员销售总数：{0}", count21); 
            } 
            break; 
          } 
        } 
    } 
  } 
} 

Monitor.Enter(lockObject);
iPutHBnum++;
Monitor.Exit(lockObject);

mutex1.WaitOne(); 
iPutHBnum++;
mutex1.ReleaseMutex();