本文实例讲述了基于C#实现的多生产者多消费者同步问题，分享给大家供大家参考之用。具体代码如下：
// 多个生产者和多个消费者，能生产n个产品的情况 using System; using System.Threading; public class HoldIntegerSynchronized{ private int[] buffer; //缓冲区 private int occupiedBufferCount = 0; private int readPosition = 0 , writePosition = 0; //下一个读到的位置和写到的位置 public HoldIntegerSynchronized(int capacity){ buffer = new int[capacity]; } public int BufferSize{ get{ return buffer.Length; } } public int Buffer{ get{ int bufferCopy; // 加锁 lock(this){ while(occupiedBufferCount == 0){ //多个消费者，所以此处改用while Console.WriteLine(Thread.CurrentThread.Name + " tries to read. "); DisplayState("Buffer Empty. " + Thread.CurrentThread.Name + " waits."); Monitor.Wait(this); // 为临界区之外等待的生产者放行，让他来"生产" // 一直到生产者生产结束，调用了Monitor.PauseAll() // 才能继续执行下去,此时，消费者自动重新获得this的锁 } --occupiedBufferCount; bufferCopy = buffer[readPosition]; readPosition = (readPosition + 1) % buffer.Length; DisplayState(Thread.CurrentThread.Name + " reads " + bufferCopy); // 通知，让等待的 生产者线程 进入Started状态,如果生产者处于临界区之外，这句话执行完后他仍然在临界区之外 Monitor.PulseAll(this); // 释放锁 }//lock return bufferCopy; } set{ // 加锁 lock(this){ while(occupiedBufferCount == buffer.Length){ Console.WriteLine(Thread.CurrentThread.Name + " tries to write. "); DisplayState("Buffer Full. " + Thread.CurrentThread.Name + " waits."); Monitor.Wait(this); // 为临界区之外等待消费者放行，让他来"消费" // 一直到消费者调用了Monitor.Pause() // 才能继续执行下去，此时，生产者自动重新获得this的锁 } buffer[writePosition] = value; ++occupiedBufferCount; writePosition = (writePosition + 1) % buffer.Length; DisplayState(Thread.CurrentThread.Name + " writes " + value); // 通知，让Wait状态的 消费者 进入Started状态,如果消费者处于临界区之外，这句话执行完后他仍然在临界区之外 Monitor.PulseAll(this); // 释放锁 } } } 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(); } } }
希望本文所述对大家C#程序设计的学习有所帮助。
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