8.1.thread

ThreadState

Running
StopRequested
SuspendRequested
Background
Unstarted
Stopped
WaitSleepJoin
Suspended
AbortRequested
Aborted

基本使用

构造函数是传递两种delegate,然后start(object)可以给第二种delegate传递参数

使用一个类来传递参数,而不是直接传递,主要是为了解决线程安全问题
public class ThreadWrapper<T>
{
    T data;
    public ThreadWrapper(T data){this.data=data;}
    public void ThreadMethod(){
        Console.WriteLine("{0}",data);
    }
}
ThreadWrapper<string> wrapper=new ThreadWrapper<string>("Hello");
Thread t=new Thread(wrapper.ThreadMethod);
t.Start();

IsBackground属性控制是否前台,默认IsBackground=false,即默认创建的都是前台线程
    Thread t=new Thread(action){IsBackground=true}; //新建后台线程

后台线程的意思就是只要前台线程结束了,后台线程不论是否执行完毕,都随着前台线程的结束而结束

控制线程

1. 使用Start()方法使得线程处于Running状态,线程开始执行
2. 使用Join() 使线程处于WaitSleepJoin状态,阻塞调用线程,直到某个线程终止或经过了指定时间为止
3. Sleep()使线程处于WaitSleepJoin状态,在经历Sleep()的时间后,线程会再次唤醒
4. Abort()使线程处于ResetAbort状态,会抛出一个ThradAbordException类型的异常

看thread 类代码基本上看不到任何意义,它都是外部实现的,而不是用c#写的

ctor

1. public Thread(ThreadStart start)
2. public Thread(ThreadStart start,int maxStackSize)
3. public Thread(ParameterizedThreadStart start)
4. public Thread(ParameterizedThreadStart start,int maxStackSize)

ThreadStart,ParameterizedThreadStart 是两个Delegate

public delegate void ThreadStart();
public delegate void ParameterizedThreadStart(Object obj);

SetStartHelper(Delegate start,int maxStackSize)

ThreadHelper threadStartCallBack = new ThreadHelper(start)
内部调用SetStart
private extern void SetStart(Delegate start,int maxStackSize)

Start()

StackCrawlMark stackMark = StackeCrawlMark.LookForMyCaller;
Start(ref stackMark);

StartInternal(IPrincipal principal,ref StackCrawlMark stackMark)

private extern void StartInternal(IPrincipal principal,ref StackCrawlMark stackMark)

thread.cs 1820行

1. internal delegate Object InternalCrossContextDelegate(Object[] args);

2. internal class ThreadHelper

static ThreadHelper(){}
Delegate

3. internal struct ThreadHandle

private IntPtr m_ptr;
internal ThreadHandle(IntPtr pThread){
    m_ptr=pThread;
}

4. public sealed class Thread

5. interal enum StackCrawlMark

1. LookForMe=0
2. LookForMyCaller=1
3. LookForMyCallersCalle=2
4. LookForThread=3