我们来看下面的一个例子,演示如何改变线程的优先级。高优先级线程优先执行。但是不能完全保证,因为线程是高度依赖系统的。它只提高了优先级较高的线程在低优先级线程之前执行的机会。
using System;
using System.Threading;
public class MyThread
{
public void Thread1()
{
for(int i=0; i<3; i++)
{
Thread t = Thread.CurrentThread;
Console.WriteLine(t.Name + " is running");
}
}
}
public class ThreadExample
{
public static void Main()
{
MyThread mt = new MyThread();
Thread t1 = new Thread(new ThreadStart(mt.Thread1));
Thread t2 = new Thread(new ThreadStart(mt.Thread1));
Thread t3 = new Thread(new ThreadStart(mt.Thread1));
t1.Name = "Highest-Thread ";
t2.Name = "Normal-Thread ";
t3.Name = "Lowest-Thread ";
t1.Priority = ThreadPriority.Highest;
t2.Priority = ThreadPriority.Normal;
t3.Priority = ThreadPriority.Lowest;
t1.Start();
t2.Start();
t3.Start();
}
}
输出是不可预测的,因为线程系统依赖性高。它可以遵循任何算法抢先或非抢占式来执行。
执行上面示例代码,得到以下结果 -
Highest-Thread is running
Normal-Thread is running
Normal-Thread is running
Normal-Thread is running
Lowest-Thread is running
Lowest-Thread is running
Lowest-Thread is running
Highest-Thread is running
Highest-Thread is running