實(shí)例講解.NET多線程執(zhí)行函數(shù)
這里為什么會(huì)出現(xiàn)多線程?原因是DebugLZQ在寫一個(gè)LINQ綜合Demo的時(shí)候遇到了多線程,便停下手來(lái)整理一下。關(guān)于多線程的文章,園子里很多很多,因此關(guān)于多線程理論性的東西,LZ就不去多說(shuō)了,這篇博文主要是用最簡(jiǎn)單的例子,總結(jié)下多線程調(diào)用函數(shù)的相關(guān)注意點(diǎn),重點(diǎn)偏向應(yīng)用和記憶。
1.多線程調(diào)用無(wú)參函數(shù)
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- using System.Threading;
- namespace 多線程
- {
- class Program
- {
- static void Main(string[] args)
- {
- Console.WriteLine("主線程開始");
- Thread t = new Thread(new ThreadStart(ShowTime));//注意ThreadStart委托的定義形式
- t.Start();//線程開始,控制權(quán)返回Main線程
- Console.WriteLine("主線程繼續(xù)執(zhí)行");
- //while (t.IsAlive == true) ;
- Thread.Sleep(1000);
- t.Abort();
- t.Join();//阻塞Main線程,直到t終止
- Console.WriteLine("--------------");
- Console.ReadKey();
- }
- static void ShowTime()
- {
- while (true)
- {
- Console.WriteLine(DateTime.Now.ToString());
- }
- }
- }
- }
注意ThreadStart委托的定義如下:
可見其對(duì)傳遞進(jìn)來(lái)的函數(shù)要求是:返回值void,無(wú)參數(shù)。
2.多線程調(diào)用帶參函數(shù)(兩種方法)
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- using System.Threading;
- namespace 多線程2_帶參數(shù)
- {
- class Program
- {
- static void Main(string[] args)
- {
- Console.WriteLine("Main線程開始");
- Thread t = new Thread(new ParameterizedThreadStart(DoSomething));//注意ParameterizedThreadStart委托的定義形式
- t.Start(new string[]{"Hello","World"});
- Console.WriteLine("Main線程繼續(xù)執(zhí)行");
- Thread.Sleep(1000);
- t.Abort();
- t.Join();//阻塞Main線程,直到t終止
- Console.ReadKey();
- }
- static void DoSomething(object s)
- {
- string[] strs = s as string[];
- while (true)
- {
- Console.WriteLine("{0}--{1}",strs[0],strs[1]);
- }
- }
- }
- }
可見其對(duì)傳入函數(shù)的要求是:返回值void,參數(shù)個(gè)數(shù)1,參數(shù)類型object
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- using System.Threading;
- namespace 多線程2_帶參數(shù)2
- {
- class Program
- {
- static void Main(string[] args)
- {
- Guest guest = new Guest()
- {
- Name="Hello", Age=99
- };
- Thread t = new Thread(new ThreadStart(guest.DoSomething));//注意ThreadStart委托的定義形式
- t.Start();
- Thread.Sleep(1000);
- t.Abort();
- t.Join();//阻塞Main線程,直到t終止
- Console.ReadKey();
- }
- }
- //
- class Guest
- {
- public string Name { get; set; }
- public int Age { get; set; }
- public void DoSomething()
- {
- while (true)
- {
- Console.WriteLine("{0}--{1}", Name, Age);
- }
- }
- }
- }
兩種方法,可隨意選擇,***種貌似簡(jiǎn)潔一點(diǎn)。
3.線程同步
線程同步的方法有很多很多種volatile、Lock、InterLock、Monitor、Mutex、ReadWriteLock...
這里用lock說(shuō)明問題:在哪里同步,用什么同步,同步誰(shuí)?
首先感受下不同步會(huì)出現(xiàn)的問題:
代碼就是下面的代碼去掉lock塊。
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- using System.Threading;
- namespace 多線程3_同步2
- {
- class Program
- {
- static object obj = new object();//同步用
- static int balance = 500;
- static void Main(string[] args)
- {
- Thread t1 = new Thread(new ThreadStart(Credit));
- t1.Start();
- Thread t2 = new Thread(new ThreadStart(Debit));
- t2.Start();
- Console.ReadKey();
- }
- static void Credit()
- {
- for (int i = 0; i < 15; i++)
- {
- lock (obj)
- {
- balance += 100;
- Console.WriteLine("After crediting,balance is {0}", balance);
- }
- }
- }
- static void Debit()
- {
- for (int i = 0; i < 15; i++)
- {
- lock (obj)
- {
- balance -= 100;
- Console.WriteLine("After debiting,balance is {0}", balance);
- }
- }
- }
- }
- }
原文鏈接:http://www.cnblogs.com/DebugLZQ/archive/2012/11/11/2765487.html