Write a standard lock() plus double check to create a
critical section around a variable access?
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Answer Posted / 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();
}
}
}
}
| Is This Answer Correct ? | 3 Yes | 0 No |
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