2021-7-28 多线程的基本练习

多线程

using System;
using System.Threading;

namespace ThreadTest
{
    class Program
    {
        static void Main(string[] args)
        {
            
            Thread th = Thread.CurrentThread;
            th.Name = "主线程";
            Console.WriteLine(th.Name);
            Thread child = new Thread(ChildThread);
            child.Start();
            Console.WriteLine("子线程正在休眠中");//当前线程继续执行

            ThreadStart childref = new ThreadStart(NumberThread);
            Thread number = new Thread(childref);
            number.Start();
            Thread.Sleep(2000);
            //number.Abort();//线程终止,netcore3.1不能使用终止线程
            number.Interrupt();//中断线程
            Thread.Sleep(2000);
            Console.WriteLine(number.ThreadState);//获取中断线程状态
            Console.ReadKey();
        }
        static void ChildThread()
        {
            var sleepTime = 5000;
            Console.WriteLine("子线程1休眠" + sleepTime / 1000 + "秒");
            Thread.Sleep(sleepTime);//线程休眠5秒
            Console.WriteLine("子线程1休息完毕");
        }
        static void NumberThread()
        {
            try
            {
                for (int i = 0; i < 10; i++)
                {
                    Thread.Sleep(500);
                    Console.WriteLine(i);
                }
            }
            catch (ThreadInterruptedException e)
            {

                Console.WriteLine("线程已被中止");
            }
            finally
            {
                Console.WriteLine("未找到问题");
            }
        }
    }
}

 练习2

using System;
using System.Threading;

namespace MulitThread
{
    class Program
    {
        static void Main(string[] args)
        {
            Book book = new Book();
            Thread bookSale = new Thread(new ParameterizedThreadStart(book.BookSale));
            Thread bookSale1 = new Thread(new ParameterizedThreadStart(book.BookSale));
            bookSale.Start("小明");
            bookSale1.Start("小红");
            Console.ReadKey();
        }

    }
    class Book
    {
        private int book = 5;
        public void BookSale(object name)
        {
            while (true)
            {
                string buyName = name as string;
                Thread.Sleep(500);
                int a = book;
                lock (this)//如果没加线程锁，线程可能会出现数据互蹿
                {
                    if (a > 0)
                    {
                        book--;
                        Console.WriteLine($"{buyName}购买一本，书籍还剩{book}本");
                    }
                }

            }
        }
    }
}

 优化

using System;
using System.Threading;

namespace MulitThread
{
    class Program
    {
        static void Main(string[] args)
        {
            Book book = new Book();
            Thread bookSale = new Thread(new ParameterizedThreadStart(book.BookSale));
            Thread bookSale1 = new Thread(new ParameterizedThreadStart(book.BookSale));
            bookSale.Start("小明");
            bookSale1.Start("小红");
            Console.ReadKey();
        }

    }
    class Book
    {
        private int book = 5;
        public void BookSale(object name)
        {
            while (true)
            {
                string buyName = name as string;
                Thread.Sleep(500);
                int a = book;
                lock (this)//如果没加线程锁，线程可能会出现数据互蹿
                {
                    if (a > 0)
                    {
                        book--;
                        Console.WriteLine($"{buyName}购买一本，书籍还剩{book}本");
                    }
                    else
                    {
                        break;
                    }
                }

            }
            Console.WriteLine("书籍已经销售完了");
        }
    }
}

 再次优化，当线程thread.sleep注释后出现-1所以可改成以下情况

using System;
using System.Threading;

namespace MulitThread
{
    class Program
    {
        static void Main(string[] args)
        {
            Book book = new Book();
            Thread bookSale = new Thread(new ParameterizedThreadStart(book.BookSale));
            Thread bookSale1 = new Thread(new ParameterizedThreadStart(book.BookSale));
            bookSale.Start("小明");
            bookSale1.Start("小红");
            Console.ReadKey();
        }

    }
    class Book
    {
        private int book = 5;
        public void BookSale(object name)
        {
            while (true)
            {
                string buyName = name as string;
                Thread.Sleep(500);
                int a = book;
                lock (this)//如果没加线程锁，线程可能会出现数据互蹿
                {
                    if (a > 0)
                    {
                        book--;
                        Console.WriteLine($"{buyName}购买一本，书籍还剩{book}本");
                    }
                    else
                    {
                        break;
                    }
                }

            }
            Console.WriteLine("书籍已经销售完了");
        }
    }
}