如何打破只包含受限执行区 (CER) 的循环

Question

我正在使用受限执行区 (CER) 来保护线程的 while 循环内的代码部分：

private static void MyThreadFunc()
{
    try {
        ...
        while (true)
        {
            RuntimeHelpers.PrepareConstrainedRegions();
            try { }
            finally
            {
                // do something not to be aborted
            }
            Thread.Sleep(1);    // allow while loop to be broken out
        }
    }
    catch (ThreadAbortException e)
    {
         // handle the exception 
    }
}

问题是，如果我不在 while 循环末尾引入 Thread.Sleep(1) 语句，任何对线程调用 Thread.Abort() 的尝试都会挂起。有没有更好的方法在不使用 Thread.Sleep() 函数的情况下中止线程？

Answer 1

我不知道您为什么需要手动中止线程，因为 CLR 会在线程完成后执行此操作，或者使用 Thread.Join to wait until it terminates. But you can make use of the ManualResetEvent 优雅地中止它。

我通过将 while(true) 替换为 ManualResetEvent

对代码进行了一些更改

class ThreadManager
{
    private ManualResetEvent shutdown = new ManualResetEvent(false);
    private Thread thread;

    public void start ()
    {
        thread = new Thread(MyThreadFunc);
        thread.Name = "MyThreadFunc";
        thread.IsBackground = true; 
        thread.Start();
    }

    public void Stop ()
    {
        shutdown.Set();
        if (!thread.Join(2000)) //2 sec to stop 
        { 
            thread.Abort();
        }
    }

    void MyThreadFunc ()
    {
        while (!shutdown.WaitOne(0))
        {
            // call with the work you need to do
            try {
                    RuntimeHelpers.PrepareConstrainedRegions();
                    try { }
                    finally
                    {
                        // do something not to be aborted
                    }
                }
                catch (ThreadAbortException e)
                {
                        // handle the exception 
                }
        }
    }
}

如何打破只包含受限执行区 (CER) 的循环

How to break out a loop contains only a constrained execution region (CER)

c#

multithreading

constrained-execution-reg