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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Threading;
using System.Collections;
namespace Exchange
{
/// <summary>
/// Summary description for Class1.
/// </summary>
class Class1
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static int Main(string[] args)
{
int rValue = 0;
Thread[] threads = new Thread[100];
ThreadSafe tsi = new ThreadSafe(threads.Length);
for (int i = 0; i < threads.Length; i++)
{
threads[i] = new Thread(new ThreadStart(tsi.ChangeValue));
threads[i].Name = i.ToString();
threads[i].Start();
}
tsi.Signal();
for(int i=0;i<threads.Length;i++)
threads[i].Join();
if(tsi.Success)
rValue = 100;
Console.WriteLine("Test {0}", rValue == 100 ? "Passed" : "Failed");
return rValue;
}
}
public class ThreadSafe
{
private int threadCount;
ManualResetEvent signal;
private IntPtr mValue;
private int accessCount;
private static object myLock = new Object();
public ThreadSafe(int size)
{
threadCount = size;
mValue = IntPtr.Zero;
signal = new ManualResetEvent(false);
}
public void Signal()
{
signal.Set();
}
public bool Success
{
get {
Console.WriteLine("AccessCount {0} should equal threadCount {1}", accessCount, threadCount);
Console.WriteLine("mValue.ToInt32 {0} should equal threadCount {1}", mValue.ToInt32(), threadCount);
return (accessCount == threadCount) && (mValue.ToInt32() == threadCount);
}
}
public void ChangeValue()
{
IntPtr initialValue, newValue;
signal.WaitOne();
do
{
initialValue = mValue;
lock (myLock)
{
newValue = new IntPtr(mValue.ToInt32() + 1);
}
} while (initialValue != Interlocked.CompareExchange(ref mValue, newValue, initialValue));
Interlocked.Increment(ref accessCount);
}
}
}
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