thread processor count conflict test

MultiTaskWithProcessorCount.cs

using System.Threading.Tasks;
using System.Threading;
using System.Linq;
using System;

await ThreadIdTest(100, 100);

async Task ThreadIdTest(int minThreads, int minCompletionNum)
{
    ThreadPool.GetMinThreads(out var currentMinThreads, out var currentCompletionNum);
    try
    {
        var ar = new long[Environment.ProcessorCount];
        ThreadPool.SetMinThreads(minThreads, minCompletionNum);
        
        await Task.WhenAll(Enumerable.Range(0, 10000).Select(async (idx) =>
        {
            for (int i = 0; i < 10000; i++)
            {
                await Task.Yield();
                ar[Thread.GetCurrentProcessorId()] += 1;
            }
        }));
        foreach(var (idx, num) in ar.Select((idx, num) => (idx, num)))
        {
            Console.WriteLine($"{idx}: {num}");
        }
        // This cannot be 100000000
        Console.WriteLine($"total: {ar.Sum()}");
    }
    finally
    {
        ThreadPool.SetMinThreads(currentMinThreads, currentCompletionNum);
    }
}