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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.Runtime.CompilerServices;
internal class Repro
{
private static volatile bool s_threadsCompleted;
private static volatile Mutex s_myMutex;
private static volatile int[] s_threadSum;
public static int Main()
{
ThreadStart ts = new ThreadStart(FibThread);
Thread t1 = new Thread(ts);
Thread t2 = new Thread(ts);
Thread t3 = new Thread(ts);
long threadValue;
s_threadsCompleted = false;
s_threadSum = new int[3];
s_threadSum[0] = 0;
s_threadSum[1] = 0;
s_threadSum[2] = 0;
s_myMutex = new Mutex();
t1.Start();
t2.Start();
t3.Start();
while (!s_threadsCompleted)
{
GC.Collect();
}
t1.Join();
t2.Join();
t3.Join();
threadValue = (s_threadSum[0] + s_threadSum[1] + s_threadSum[2]);
if (((long)54018518 * 3) != threadValue)
{
Console.WriteLine("FALSE: {0} != {1}", ((long)439201 * 3), threadValue);
return 0;
}
else
{
Console.WriteLine("PASS");
return 100;
}
}
public static void FibThread()
{
int sum = 0;
const int length = 35;
for (int i = 0; i <= length; i++)
{
sum += fib(0, i);
Console.WriteLine("" + i + ": " + sum);
}
s_threadsCompleted = true;
s_myMutex.WaitOne();
if (0 == s_threadSum[0]) s_threadSum[0] = sum;
if (0 == s_threadSum[1]) s_threadSum[1] = sum;
if (0 == s_threadSum[2]) s_threadSum[2] = sum;
s_myMutex.ReleaseMutex();
}
public static int fib(int sum, int num)
{
if (num <= 2)
{
return simple(sum, num);
}
return fib(fib(sum, num - 1), num - 2);
}
public static int simple(int sum, int num)
{
if (num == 0)
{
return sum + 0;
}
if (num == 1)
{
return sum + 1;
}
if (num == 2)
{
return sum + 3;
}
return 555555;
}
}
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