1114-PrintInOrder.cs

//-----------------------------------------------------------------------------
// Runtime: 112ms
// Memory Usage: 25.1 MB
// Link: https://leetcode.com/submissions/detail/333626473/
//-----------------------------------------------------------------------------

using System;
using System.Threading;

namespace LeetCode
{
    public class Foo
    {
        private EventWaitHandle waitHandle1;
        private EventWaitHandle waitHandle2;

        public Foo()
        {
            waitHandle1 = new AutoResetEvent(false);
            waitHandle2 = new AutoResetEvent(false);
        }

        public void First(Action printFirst)
        {

            // printFirst() outputs "first". Do not change or remove this line.
            printFirst();

            waitHandle1.Set();
        }

        public void Second(Action printSecond)
        {
            waitHandle1.WaitOne();

            // printSecond() outputs "second". Do not change or remove this line.
            printSecond();

            waitHandle2.Set();
        }

        public void Third(Action printThird)
        {
            waitHandle2.WaitOne();

            // printThird() outputs "third". Do not change or remove this line.
            printThird();
        }
    }
}