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有趣的多线程编程(4)——死锁

王朝other·作者佚名  2006-02-04
窄屏简体版  字體: |||超大  

// DeadLockSample.cs

// 分析一下为什么会发生死锁?

using System;

using System.Threading;

public class Test

{

static readonly object firstLock = new object();

static readonly object secondLock = new object();

static void Main()

{

new Thread(new ThreadStart(ThreadJob)).Start();

// Wait until we're fairly sure the other thread

// has grabbed firstLock

Thread.Sleep(500);

Console.WriteLine ("Locking secondLock");

lock (secondLock)

{

Console.WriteLine ("Locked secondLock");

Console.WriteLine ("Locking firstLock");

lock (firstLock)

{

Console.WriteLine ("Locked firstLock");

}

Console.WriteLine ("Released firstLock");

}

Console.WriteLine("Released secondLock");

}

static void ThreadJob()

{

Console.WriteLine ("\t\t\t\tLocking firstLock");

lock (firstLock)

{

Console.WriteLine("\t\t\t\tLocked firstLock");

// Wait until we're fairly sure the first thread

// has grabbed secondLock

Thread.Sleep(1000);

Console.WriteLine("\t\t\t\tLocking secondLock");

lock (secondLock)

{

Console.WriteLine("\t\t\t\tLocked secondLock");

}

Console.WriteLine ("\t\t\t\tReleased secondLock");

}

Console.WriteLine("\t\t\t\tReleased firstLock");

}

}

Locking firstLock

Locked firstLock

Locking secondLock

Locked secondLock

Locking firstLock

Locking secondLock

因应之道,使用Queue和Monitor:

//QueueMonitorThread.cs

using System;

using System.Collections;

using System.Threading;

public class Test

{

static ProducerConsumer queue;

static void Main()

{

queue = new ProducerConsumer();

new Thread(new ThreadStart(ConsumerJob)).Start();

Random rng = new Random(0);

for (int i=0; i < 10; i++)

{

Console.WriteLine ("Producing {0}", i);

queue.Produce(i);

Thread.Sleep(rng.Next(1000));

}

}

static void ConsumerJob()

{

// Make sure we get a different random seed from the

// first thread

Random rng = new Random(1);

// We happen to know we've only got 10

// items to receive

for (int i=0; i < 10; i++)

{

object o = queue.Consume();

Console.WriteLine ("\t\t\t\tConsuming {0}", o);

Thread.Sleep(rng.Next(1000));

}

}

}

public class ProducerConsumer

{

readonly object listLock = new object();

Queue queue = new Queue();

public void Produce(object o)

{

lock (listLock)

{

queue.Enqueue(o);

if (queue.Count==1)

{

Monitor.Pulse(listLock);

}

}

}

public object Consume()

{

lock (listLock)

{

while (queue.Count==0)

{

Monitor.Wait(listLock);

}

return queue.Dequeue();

}

}

}

Producing 0

Consuming 0

Producing 1

Consuming 1

Producing 2

Consuming 2

Producing 3

Consuming 3

Producing 4

Producing 5

Consuming 4

Producing 6

Consuming 5

Consuming 6

Producing 7

Consuming 7

Producing 8

Consuming 8

Producing 9

Consuming 9

 
 
 
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