// 多個生產者和多個消費者，能生產n個產品的情況using System;using System.Threading;public class HoldIntegerSynchronized{ PRivate int[] buffer;  //緩沖區 private int occupiedBufferCount = 0;  private int readPosition = 0 , writePosition = 0; //下一個讀到的位置和寫到的位置  public HoldIntegerSynchronized(int capacity){  buffer = new int[capacity]; }  public int BufferSize{  get{   return buffer.Length;  } } public int Buffer{  get{   int bufferCopy;   // 加鎖   lock(this){    while(occupiedBufferCount == 0){ //多個消費者，所以此處改用while     Console.WriteLine(Thread.CurrentThread.Name + " tries to read. ");     DisplayState("Buffer Empty. " + Thread.CurrentThread.Name + " waits.");     Monitor.Wait(this);      // 為臨界區之外等待的生產者放行，讓他來"生產"     // 一直到生產者生產結束，調用了Monitor.PauseAll()     // 才能繼續執行下去,此時，消費者自動重新獲得this的鎖    }    --occupiedBufferCount;    bufferCopy = buffer[readPosition];    readPosition = (readPosition + 1) % buffer.Length;            DisplayState(Thread.CurrentThread.Name + " reads " + bufferCopy);    // 通知，讓等待的 生產者線程 進入Started狀態,如果生產者處于臨界區之外，這句話執行完后他仍然在臨界區之外    Monitor.PulseAll(this);   // 釋放鎖   }//lock   return bufferCopy;  }  set{   // 加鎖   lock(this){    while(occupiedBufferCount == buffer.Length){     Console.WriteLine(Thread.CurrentThread.Name + " tries to write. ");     DisplayState("Buffer Full. " + Thread.CurrentThread.Name + " waits.");     Monitor.Wait(this);      // 為臨界區之外等待消費者放行，讓他來"消費"     // 一直到消費者調用了Monitor.Pause()     // 才能繼續執行下去，此時，生產者自動重新獲得this的鎖    }    buffer[writePosition] = value;        ++occupiedBufferCount;         writePosition = (writePosition + 1) % buffer.Length;    DisplayState(Thread.CurrentThread.Name + " writes " + value);    // 通知，讓Wait狀態的 消費者 進入Started狀態,如果消費者處于臨界區之外，這句話執行完后他仍然在臨界區之外    Monitor.PulseAll(this);   // 釋放鎖   }  } } public void DisplayState(string Operation){  Console.Write("{0,-35}",operation);  for(int i = 0; i < BufferSize; i++ ){   int a = readPosition;   int b = writePosition;   if( a <= i && i < b) {    Console.Write("{0,-9}",buffer[i]);   }else if( b < a && !( b <= i && i < a ) ){    Console.Write("{0,-9}",buffer[i]);   }else if( occupiedBufferCount == BufferSize){    Console.Write("{0,-9}",buffer[i]);   }else{    Console.Write("{0,-9}","");   }  }  Console.WriteLine("{0}/r/n",occupiedBufferCount); }}class Producer{ private HoldIntegerSynchronized sharedLocation; private Random randomSleepTime; public Producer(HoldIntegerSynchronized shared,Random random){  sharedLocation = shared;  randomSleepTime = random; }  public void Produce(){  for (int count=0; count<3; count++) {   Thread.Sleep(randomSleepTime.Next(1,2000));   sharedLocation.Buffer = randomSleepTime.Next(5,10);  }  Console.WriteLine(Thread.CurrentThread.Name + " done producing./r/nTerminating " + Thread.CurrentThread.Name + "./r/n"); }}class Consumer{ private HoldIntegerSynchronized sharedLocation; private Random randomSleepTime; public Consumer(HoldIntegerSynchronized shared,Random random){  sharedLocation = shared;  randomSleepTime = random; }  public void Consume(){  int sum = 0;  for (int count=0; count<4; count++) {   Thread.Sleep(randomSleepTime.Next(1,2000));   sum += sharedLocation.Buffer;  }  Console.WriteLine(Thread.CurrentThread.Name + " read values totaling:" + sum + "/r/nTerminating " + Thread.CurrentThread.Name + "."); } }class SharedCell{ static void Main(string[] args){  HoldIntegerSynchronized holdInteger = new HoldIntegerSynchronized(5);  Random random = new Random();     Thread[] producerThreads = new Thread[4];  Thread[] consumerThreads = new Thread[3];  Console.Write("{0,-35}","Operation");  for(int i = 0;i < holdInteger.BufferSize;i++){   Console.Write("{0,-9}","Elem " + i);  }  Console.WriteLine("Occupied Count/r/n");  for(int i = 0; i < producerThreads.Length;i++){   Producer producer = new Producer(holdInteger,random);   producerThreads[i] = new Thread(new ThreadStart(producer.Produce));   producerThreads[i].Name = "Producer No." + i;  }  for(int i = 0; i < consumerThreads.Length;i++){   Consumer consumer = new Consumer(holdInteger,random);   consumerThreads[i] = new Thread(new ThreadStart(consumer.Consume));   consumerThreads[i].Name = "Consumer No." + i;  }  for(int i = 0; i < producerThreads.Length;i++){   producerThreads[i].Start();  }  for(int i = 0; i < consumerThreads.Length;i++){   consumerThreads[i].Start();  } }}