Critical Section非托管C ++无法正常工作 [英] Critical Section unmanaged C++ not working

问题描述

我在C ++ CLR程序中有一些代码，其中包含以下Critical Section代码。

I have some code in a C++ CLR program with the below Critical Section code.

<pre lang="xml">
///Test.cpp
static CRITICAL_SECTION	PrintCriticalSection;
void Test(int sleep1,int threadNumber)
    {
        cout&lt;&lt;&quot;Thread &quot;&lt;&lt;threadNumber&lt;&lt;&quot; Starts. Sleeping for &quot;&lt;&lt;sleep1&lt;&lt;&quot; seconds.\n&quot;;
        EnterCriticalSection(&amp;PrintCriticalSection);
        Sleep(sleep1);
        LeaveCriticalSection(&amp;PrintCriticalSection);
        cout&lt;&lt;&quot;Thread &quot;&lt;&lt;threadNumber&lt;&lt;&quot; Ends.\n&quot;;

    }</pre>

我使用2个主题调用此代码

I am calling this code using 2 Threads

<pre lang="xml">
class Program
    {
         Thread thread1;
         Thread thread2;
         PhoneCLR.PhonePortCLR test1;
         PhoneCLR.PhonePortCLR test2;
        static void Main(string[] args)
        {
            Program program1=new Program();
            program1.Test1();
             }

        void Test1()
        {
            test1 = new PhonePortCLR(1, 1, 1, 1, true, false, true, false, 1);
            test2 = new PhonePortCLR(1, 1, 1, 1, true, false, true, false, 1);
            PhonePortCLR.InitGlobalOnce(1, false, false, false, false);
            thread1 = new Thread(new ThreadStart(function1));
            thread2 = new Thread(new ThreadStart(function2));
            thread1.Start();
            thread2.Start();
           
            Console.ReadLine();
        }
       
         void function1()
        {
            test1.Test(10000, 1);
        }
         void function2()
        {
            test2.Test(100,2);
        }
    }
}
</pre>

控制台窗口中的输出应为：



线程2开始。睡觉100秒。

线程1开始。睡了10000秒。

///这里应该暂停10,000秒

线程2结束。

线程1结束。



但我得到的输出是随机的。有时我会得到上述内容，但有时我会得到以下输出。太奇怪了。为什么会这样？我可以用什么来解决这个问题呢？救命！！！！！它像六分之一，我得到低于输出。我很高兴我抓住了这个。我还注意到，如果我将变量设置为global而不是static，我每次都会得到以下值（Critical Section不起作用）



控制台窗口中的输出有时候：



线程2开始。睡觉100秒。

线程1开始。睡觉10000秒。

线程2结束。

///这里现在发生10秒暂停...

线程1结束。

The output in console window is supposed to be :

Thread 2 Starts. Sleeping for 100 seconds.
Thread 1 Starts. Sleeping for 10000 seconds.
///There is supposed to be a pause of 10,000 seconds here
Thread 2 Ends.
Thread 1 Ends.

But the output I am getting is random. Sometimes I get the above but sometimes I get below Output. It is so weird. Why is this the case? What can I use instead to fix this issue? Help!!!!! Its like 1 in 6 times I get below output. I am glad I caught this. I also notice that if I make the variable global instead of static, I get the below every time( Critical Section does not work)

The output in console window is sometimes:

Thread 2 Starts. Sleeping for 100 seconds.
Thread 1 Starts. Sleeping for 10000 seconds.
Thread 2 Ends.
///The 10 second pause happens now here...
Thread 1 Ends.

推荐答案

这正是预期的结果。



你滥用 CriticalSection 以一种我从未想象过的有趣方式。你用它保护什么？致电睡眠！



结案时间。



我无法想象你想到的方式。除非这只是一手牌，否则我会说你不知道 CriticalSection 用于什么。试着理解它。为此，请阅读： http://en.wikipedia.org/wiki/Mutual_exclusion [ ^ ]。



更好现在？ :-)

-SA

This is exactly the expected result.

You misuse CriticalSection in such a funny way which I never even imagined. What do you "protect" with it? The call to Sleep!

Case closed.

I cannot imagine the way you could possibly think. Unless this is a slip of a hand, I would say you have no idea what CriticalSection is used for. Try to understand it. For this purpose, read this: http://en.wikipedia.org/wiki/Mutual_exclusion[^].

Better now? :-)

—SA

通过将关键部分移动到测试代码顶部来修复

并添加

Fixed by moving critical section to top of the test code
and adding

thread1.Start();
Thread.Sleep(1000);
thread2.Start();

static CRITICAL_SECTION	PrintCriticalSection;
void Test(int sleep1,int threadNumber)
    {
         EnterCriticalSection(&PrintCriticalSection);
        cout<<"Thread "<<threadNumber<<" Starts. Sleeping for "<<sleep1<<" seconds.\n";
       
        Sleep(sleep1);
        
        cout<<"Thread "<<threadNumber<<" Ends.\n";
        LeaveCriticalSection(&PrintCriticalSection);
    }
 


class Program
    {
         Thread thread1;
         Thread thread2;
         PhoneCLR.PhonePortCLR test1;
         PhoneCLR.PhonePortCLR test2;
        static void Main(string[] args)
        {
            Program program1=new Program();
            program1.Test1();
             }
 
        void Test1()
        {
            test1 = new PhonePortCLR(1, 1, 1, 1, true, false, true, false, 1);
            test2 = new PhonePortCLR(1, 1, 1, 1, true, false, true, false, 1);
            PhonePortCLR.InitGlobalOnce(1, false, false, false, false);
            thread1 = new Thread(new ThreadStart(function1));
            thread2 = new Thread(new ThreadStart(function2));
            thread1.Start();
            Thread.Sleep(1000);
            thread2.Start();
           
            Console.ReadLine();
        }
       
         void function1()
        {
            test1.Test(10000, 1);
        }
         void function2()
        {
            test2.Test(100,2);
        }
    }
}

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