预防线程占用资源时间过长，导致资源被意外回收的线程释放在重启

预防线程占用资源时间过长，导致资源被意外回收的线程释放在重启

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;

namespace ThreadRedoTest
{
class Program
{
static void Main(string[] args)
{
int leng = 2929;
int leng_tmp = 0;
int i = 0;

        Thread mythd1 = new Thread(output);
        Thread mythd2 = new Thread(waiting);
        mythd1.Start();
        mythd2.Start();
        Console.ReadLine();

        void output()
        {
            for (; i < 10; i++)
            {
                if (leng_tmp < leng)
                {
                    leng_tmp++;
                    Console.WriteLine(i + "+" + leng_tmp);
                }
            }
        }
        void waiting()
        {
            while (true)
            {
                if (mythd1.ThreadState == ThreadState.Stopped)
                {
                    Console.WriteLine("ThreadState==Stopped判断----1");
                    if (leng_tmp < leng)
                    {
                       Console.WriteLine("leng_tmp < leng判断----2");
                        mythd1.Abort();
                        Thread.Sleep(1);
                        mythd1 = new Thread(output);
                        mythd1.Start();
                        Thread.Sleep(1000);
                        Console.WriteLine("mythd1.Start()启动-----3");
                    }
                    else {
                        break;
                    }
                }
            Thread.Sleep(1000);
            }
            
        }
    }
}

}

这里
mythd1 = new Thread(output);
mythd1.Start();
start mythd1没有启动成功是什么原因？
启动成功应该是会跑一圈output（）才是的，求解