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[原创]C#编写的多生产者多消费者同步问题

王朝c#·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

// 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();

}

}

}

 
 
 
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