C# 多线程 整数 +1

 多线程 整数 +1; 有如下的写法：

while (true)
{ 
    var mre = new AutoResetEvent(true);
    int m = 0;

    for (int i = 0; i < 200; i++)
    {
        Task.Run(() =>
        {
            mre.WaitOne();
            m++;
            mre.Set();
        });
    }

    Console.ReadLine();
    Console.WriteLine($"waiting...{m}");
}


while (true)
{
    var mut = new Mutex();

    int m = 0;

    for (int i = 0; i < 200; i++)
    {
        _ = Task.Run(() =>
        {
            mut.WaitOne();
            m++;
           
            mut.ReleaseMutex();
            
        });
    }
    Console.ReadLine();
    Console.WriteLine($"waiting,mutex...{m}");
}


while (true)
{
    SpinLock spinLock = new SpinLock(false);
    
    int m = 0;

    for (int i = 0; i < 200; i++)
    {
        bool sp = false;
        _ = Task.Run(() =>
        {
            try
            {
                spinLock.Enter(ref sp);
                m++;
            }
            catch (global::System.Exception e)
            {
                global::System.Console.WriteLine(e.Message);
            }

            finally 
            {
                if (sp)
                    spinLock.Exit();
            }
        });
    }
    Console.ReadLine();
    Console.WriteLine($"waiting...{m}");
}


while (true)
{
    int m = 0;

    for (int i = 0; i < 200; i++)
    {
        Task.Run(() => {
            Interlocked.Increment(ref m);
        });
    }
    Console.ReadLine();
    Console.WriteLine($"waiting...{m}");
}



while (true) // 不正确
{
    int m = 0;

    for (int i = 0; i < 200; i++)
    {
        Task.Run(() => {
            m++;
        });
    }

    Console.ReadLine();
    Console.WriteLine($"waiting...{m}");
}