c# - 为什么会抛出 ApplicationException？

Question

我只是在 Mutex 上进行试验并编写了以下代码。

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

namespace Mutex_WaitOnewithTimeouts
{
    class Program
    {
        private static Mutex mut = new Mutex();
        private static int numOfThreads = 5;
        private static int numOfIterations = 3;
        private static Random rand = new Random();

        static void Main(string[] args)
        {
            Thread[] threads = new Thread[5];
            for (int num = 0; num < numOfThreads; num++)
            {
                threads[num] = new Thread(new ThreadStart(MyThreadProc));
                threads[num].Name = String.Format("Thread{0}", num);
                threads[num].Start();
            }
            Console.Read();
        }

        private static void MyThreadProc()
        {
            for (int iteration = 0; iteration < numOfIterations; iteration++)
            {
                UseResource();
            }
        }

        private static void UseResource()
        {
            Console.WriteLine("{0} accessing ", Thread.CurrentThread.Name);
            int time = (int)(rand.NextDouble() * 100);
            try
            {
                if (mut.WaitOne(time))
                {
                    Console.WriteLine("Yippie got mutex for {0}", Thread.CurrentThread.Name);
                    Thread.Sleep((int)rand.NextDouble() * 5000);
                }
                else
                {
                    Console.WriteLine("Nopee.... Timeout occured for {0}", Thread.CurrentThread.Name);
                }
            }
            catch (AbandonedMutexException ex)
            {
                Console.WriteLine(" Exception is caught");
            }
            finally 
            {
                Console.WriteLine("Releasing mutex for {0}", Thread.CurrentThread.Name);
               mut.ReleaseMutex();

            }

        }
    }
}

但我有时会收到 ApplicationException。如果我的代码有任何问题，有人可以帮助我吗，还请解释何时会触发此异常。

从未同步的代码块调用了对象同步方法。尝试释放互斥锁时，我在 finally block 中得到了这个。

Answer 1

即使 WaitOne 失败，您也正在释放互斥量。将 ReleaseMutex 调用移动到您知道已获得互斥锁的 if 语句中。