lock.cs

c#多线程源代码

using System;
using System.Threading;

internal class Account 
{
	int balance;
	Random r = new Random();
	internal Account(int initial) 
	{
		balance = initial;
	}

	internal int Withdraw(int amount) 
	{
			if (balance < 0) 
			{
				throw new Exception("Negative Balance");
			}

			// 试试注释掉lock看看有什么情况发生
			lock (this)
			{
				Console.WriteLine("Current Thread:"+Thread.CurrentThread.Name);
				if (balance >= amount) 
				{
					Thread.Sleep(5);
					balance = balance - amount;
					return amount;
				} 
         
				else 
				{
					return 0; 
				}
			}
	}
	internal void DoTransactions() 
	{
		for (int i = 0; i < 100; i++) 
		{
			Withdraw(r.Next(-50, 100));
		}
	}
}

internal class Test 
{
	static internal Thread[] threads = new Thread[10];

	public static void Main() 
	{
		Account acc = new Account (0);
		for (int i = 0; i < 10; i++) 
		{
			Thread t = new Thread(new ThreadStart(acc.DoTransactions));
			threads[i] = t;
		}
		for (int i = 0; i < 10; i++) 
		{
			threads[i].Name=i.ToString();
		}
		for (int i = 0; i < 10; i++) 
		{
			threads[i].Start();
		}
		Console.ReadLine();
	}
}