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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;
namespace CompareExchangeLong
{
class CompareExchangeLong
{
static int Main(string[] args)
{
// Check number of args
if(args.Length != 2)
{
Console.WriteLine("USAGE: CompareExchangeLong " +
"/loops:<int> /addVal:<long>");
return -1;
}
// Get the args
int loops=100;
long valueToAdd = 0;
for(int i=0;i<args.Length;i++)
{
if(args[i].ToLower().StartsWith("/loops:"))
{
loops = Convert.ToInt32(args[i].Substring(7));
continue;
}
if(args[i].ToLower().StartsWith("/addval:"))
{
valueToAdd = Convert.ToInt64(args[i].Substring(8));
continue;
}
}
int rValue = 0;
Thread[] threads = new Thread[100];
ThreadSafe tsi = new ThreadSafe(loops, valueToAdd);
for (int i = 0; i < threads.Length; i++)
{
threads[i] = new Thread(new ThreadStart(tsi.ThreadWorker));
threads[i].Start();
}
tsi.Signal();
for(int i=0;i<threads.Length;i++)
threads[i].Join();
if(tsi.Total == tsi.Expected * threads.Length)
rValue = 100;
Console.WriteLine("Expected: "+ (tsi.Expected * threads.Length));
Console.WriteLine("Actual : "+ tsi.Total);
Console.WriteLine("Test {0}", rValue == 100 ? "Passed" : "Failed");
return rValue;
}
}
public class ThreadSafe
{
ManualResetEvent signal;
private long totalValue = 0;
private int numberOfIterations;
private long valueToAdd;
public ThreadSafe(): this(100,Int64.MaxValue) { }
public ThreadSafe(int loops, long value)
{
signal = new ManualResetEvent(false);
numberOfIterations = loops;
valueToAdd = value;
}
public void Signal()
{
signal.Set();
}
public void ThreadWorker()
{
signal.Set();
for(int i=0;i<numberOfIterations;i++)
AddToTotal(valueToAdd);
}
public long Expected
{
get
{
return (numberOfIterations * valueToAdd);
}
}
public long Total
{
get { return totalValue; }
}
private long AddToTotal(long addend)
{
long initialValue, computedValue;
signal.WaitOne();
do
{
initialValue = totalValue;
computedValue = initialValue + addend;
}
while (initialValue != Interlocked.CompareExchange(ref totalValue,
computedValue, initialValue));
return computedValue;
}
}
}
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