Write a standard lock() plus double check to create a critical section around a

Write a standard lock() plus double check to create a
critical section around a variable access?

Question Posted / .netguru

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Write a standard lock() plus double check to create a critical section around a variable access?..

Answer / debmalya kundu

using System;
using System.Text;

using System.Threading;

namespace thread01

{

public class Counter

{

private int _count=0;

private int _even=0;

public int Count { get { return _count; } }

public int EvenCount { get { return _even; } }

private Object theLock = new Object();

public void UpdateCount()

{

lock (theLock)

{

_count = _count + 1;

if (Count % 2 == 0) // An even number

{

_even += 1;

}

}

}

}

class Program

{

static void Main(string[] args)

{

Counter count = new Counter();

ParameterizedThreadStart starter = new
ParameterizedThreadStart(Program.UpdateCount);

Thread[] threads = new Thread[10];

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

{

threads[x] = new Thread(starter);

threads[x].Start(count);

}

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

{

threads[y].Join();

}

Console.WriteLine("Total: {0} - Even: {1}",
count.Count,count.EvenCount);

Console.ReadKey();

Console.ReadKey();

}

static void UpdateCount(object param)

{

Counter count = (Counter)param;

for (int z = 1; z <= 100000; ++z)

{

count.UpdateCount();

}

}

}

}