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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;
class Class1
{
static int Main(string[] args)
{
int rValue = 0;
Thread[] threads = new Thread[100];
ThreadSafe tsi = new ThreadSafe();
Console.WriteLine("Creating threads");
for (int i = 0; i < threads.Length - 1; i++)
{
if (i % 2 == 0)
threads[i] = new Thread(new
ParameterizedThreadStart(tsi.ThreadWorkerA));
else
threads[i] = new Thread(new
ParameterizedThreadStart(tsi.ThreadWorkerB));
threads[i].Start(args);
}
Console.WriteLine("Starting checker");
threads[threads.Length - 1] = new Thread(new ThreadStart(tsi.ThreadChecker));
threads[threads.Length - 1].Start();
//Added to prevent races where Checker does not get to Wait before ManualEvent is Set
while(tsi.ThreadCount < 100)
{
Thread.Sleep(100);
}
Thread.Sleep(100);
tsi.Signal();
Console.WriteLine("Joining threads");
for (int i = 0; i < threads.Length; i++)
threads[i].Join();
if (tsi.Pass)
rValue = 100;
Console.WriteLine("Test {0}", rValue == 100 ? "Passed" : "Failed");
return rValue;
}
}
public class ThreadSafe
{
ManualResetEvent signal;
private string curVal = "start string";
private int numberOfIterations;
private string newValueA = "hello";
private string newValueB = "world";
private bool success;
public volatile int ThreadCount = 0;
private volatile static object syncroot = new object();
public ThreadSafe(): this(10000) { }
public ThreadSafe(int loops)
{
success = true;
signal = new ManualResetEvent(false);
numberOfIterations = loops;
}
public void Signal()
{
signal.Set();
}
public void ThreadWorkerA(object obj)
{
string[] str = (string[])obj;
string ret = null;
// get the value
if(0 < str.Length)
{
if("null" == str[0])
newValueA = null;
else if("empty" == str[0])
newValueA = string.Empty;
else
newValueA = str[0];
}
lock(syncroot)
{
ThreadCount++;
}
signal.WaitOne();
for (int i = 0; i < numberOfIterations; i++)
{
ret = Interlocked.Exchange<string>(ref curVal, newValueA);
// Check return value
if(ret != newValueB && ret != newValueA && ret != "start string")
{
Console.WriteLine(ret + "," + newValueB + "," + newValueA);
success = false;
}
}
}
public void ThreadWorkerB(object obj)
{
string[] str = (string[])obj;
string ret = null;
// get the value
if(2 == str.Length)
{
if("null" == str[1])
newValueB = null;
else if("empty" == str[1])
newValueB = string.Empty;
else
newValueB = str[1];
}
lock(syncroot)
{
ThreadCount++;
}
signal.WaitOne();
for (int i = 0; i < numberOfIterations; i++)
{
ret = Interlocked.Exchange<string>(ref curVal, newValueB);
// Check return value
if(ret != newValueB && ret != newValueA && ret != "start string")
{
Console.WriteLine(ret + "," + newValueB + "," + newValueA);
success = false;
}
}
}
public void ThreadChecker()
{
lock(syncroot)
{
ThreadCount++;
}
signal.WaitOne();
string tmpVal;
for (int i = 0; i < numberOfIterations; i++)
{
tmpVal = curVal;
if (tmpVal != newValueB && tmpVal != newValueA && tmpVal != "start string")
{
Console.WriteLine(tmpVal + "," + newValueB + "," + newValueA);
success = false;
}
Thread.Sleep(0);
}
}
public bool Pass
{
get
{
return (success);
}
}
}
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