C#--理解线程

￡神魔★判官ぃ 2022-04-01 18:37 308阅读 0赞

一个进程可以有一个或多个线程，这些线程共享资源。CPU按照它自己的进度表，在各线程间切换。

线程并不提高计算机在给定时间内可以完成的工作量，但可以使计算机相应更加灵活。在.Net中，用Thread类来创建线程。如：

1 /\*   
  2  Example14\_1.cs illustrates the creation of threads  
  3  \*/   
  4   
  5  using  System;  
  6  using  System.Threading;  
  7   
  8  class  Example14\_1 \{  
  9   
 10  //  the Countdown method counts down from 1000 to 1   
 11   public  static  void  Countdown() \{  
 12  for  ( int  counter  =  1000 ; counter  >  0 ; counter \-- ) \{  
 13  Console.Write(counter.ToString()  \+  "  " );  
 14  \}  
 15  \}  
 16   
 17  public  static  void  Main() \{  
 18   
 19  //  create a second thread   
 20   Thread t2  =  new  Thread( new  ThreadStart(Countdown));  
 21   
 22  //  launch the second thread   
 23   t2.Start();  
 24   
 25  //  and meanwhile call the Countdown method from the first thread   
 26   Countdown();  
 27   
 28  \}  
 29   
 30 \}

设置优先级

Thread对象可以定义5个优先级：

*  Lowest
 *  BelowNormal
 *  Normal
 *  AboveNormal
 *  Highest

用属性Priority类设置：

1 /\*   
  2  Example14\_2.cs illustrates the use of thread priorities  
  3  \*/   
  4   
  5  using  System;  
  6  using  System.Threading;  
  7   
  8  class  Example14\_2  
  9 \{  
 10   
 11  //  the Countdown method counts down from 1000 to 1   
 12   public  static  void  Countdown()  
 13  \{  
 14  for  ( int  counter  =  1000 ; counter  >  0 ; counter \-- )  
 15  \{  
 16  Console.Write(counter.ToString()  \+  "  " );  
 17  \}  
 18  \}  
 19   
 20  public  static  void  Main()  
 21  \{  
 22   
 23  //  create a second thread   
 24   Thread t2  =  new  Thread( new  ThreadStart(Countdown));  
 25   
 26  //  set the new thread to highest priority   
 27   t2.Priority = ThreadPriority.Highest;  
 28   
 29  //  Locate the current thread and set it to the lowest priority   
 30   Thread.CurrentThread.Priority = ThreadPriority.Lowest;  
 31   
 32  //  launch the second thread   
 33   t2.Start();  
 34   
 35  //  and meanwhile call the Countdown method from the first thread   
 36   Countdown();  
 37   
 38  \}  
 39   
 40 \}