线程同步(1)
使用Monitor或lock进行线程同步的例子:
using System;
using System.Threading;
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namespace Test
{
class Program{
static long counter = 1;
static void Main()
{
Thread t1 = new Thread(f1);
Thread t2 = new Thread(f1);
t1.Start();
t2.Start();
t1.Join();
t2.Join();
if(counter != 1048576)
Console.Read();
}
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static void f1()
{
for (int i = 0; i < 10; i++)
{
/// 方法1:
/// 在多线程程序中,没有同步,所以
/// 会出现混乱状态。
counter *= 2;
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/// 方法2:
/// 用Monitor同步,可用于多线程。
//Monitor.Enter(typeof(Program));
//try { counter *= 2; }
//finally { Monitor.Exit(typeof(Program)); }
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/// 方法3:
/// C#语言用lock替代Monitor的Enter、Exit,使用方法更简洁。
//lock (typeof(Program)) { counter *= 2; }
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Console.WriteLine("counter*2 {0}", counter);
Thread.Sleep(10);
}
}
}
}
创建一个BAT脚本,调用这个程序30次。运行这个脚本。
如果用方法1,脚本可能在某个地方停下来。这时一定出现了混乱状态。
如果使用方法2或方法3,脚本不会停下来。多线程同步正确。
using System;
using System.Threading;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace Test
{
class Program{
static long counter = 1;
static object _syncRoot = new object();
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
static void Main()
{
Thread t1 = new Thread(f1);
Thread t2 = new Thread(f1);
t1.Start();
t2.Start();
t1.Join();
t2.Join();
if(counter != 1048576)
Console.Read();
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
static void f1()
{
for (int i = 0; i < 10; i++)
{
/// 方法4:
lock (_syncRoot) { counter *= 2; }
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Console.WriteLine("counter*2 {0}", counter);
Thread.Sleep(10);
}
}
}
}
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创建一个BAT脚本,调用这个程序30次。运行这个脚本。
如果用方法1,脚本可能在某个地方停下来。这时一定出现了混乱状态。
如果使用方法2或方法3,脚本不会停下来。多线程同步正确。
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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