c# – 等待信号量的正确方法是什么？

int count = 0;

        Semaphore s = new Semaphore(2,2);
        for (int x = 0; x < 10; x++)
        {
            Thread t = new Thread(new ThreadStart(delegate()
            {
                s.WaitOne();
                Thread.Sleep(1000);
                Interlocked.Increment(ref count);                       
                s.Release();
            }));
            t.Start(x);
        }

        WaitHandle.WaitAll(new WaitHandle[] { s });
        Console.WriteLine("done: {0}",count);

输出：

done: 6

如果实现我正在寻找的功能的唯一方法是将EventWaitHandle传递给每个线程,然后对那些EventWaitHandles的数组执行WaitAll(),那么在仅数组上执行WaitAll()的含义是什么信号量？换句话说,等待线程何时解除阻塞？