#include "stdafx.h"#include <iostream>using namespace std;#include <windows.h>#include <process.h>CRITICAL_SECTION cs;//1.测试同一线程两次EnterCriticalSection会不会阻塞//答案:不会/*int _tmain(int argc, _TCHAR* argv[]){    InitializeCriticalSection(&cs);    EnterCriticalSection(&cs);    EnterCriticalSection(&cs);    for(int i = 0;i < 20;i++)    {        cout<<"MainThread:"<<i<<endl;        Sleep(1000);    }    LeaveCriticalSection(&cs);    DeleteCriticalSection(&cs);    system("pause");    return 0;}*///2.测试同一线程两次EnterCriticalSection，调用一次LeaveCriticalSection 另一个线程是否可以以EnterCriticalSection//答案:不可以 两次EnterCriticalSection 必须调用 LeaveCriticalSection两次unsigned  __stdcall ThreadPorc ( void * ){    for(int i = 0;i<20;i++)    {        EnterCriticalSection(&cs);        cout<<"线程2进入"<<endl;        break;        LeaveCriticalSection(&cs);        Sleep(1000);    }    return 0;}int _tmain(int argc, _TCHAR* argv[]){    InitializeCriticalSection(&cs);    EnterCriticalSection(&cs);    EnterCriticalSection(&cs);    _beginthreadex(NULL,0,ThreadPorc,NULL,0,NULL);    for(int i = 0;i < 20;i++)    {        if(i == 10)        {            LeaveCriticalSection(&cs);        }        cout<<"MainThread:"<<i<<endl;        Sleep(1000);    }    LeaveCriticalSection(&cs);    Sleep(5000);    DeleteCriticalSection(&cs);    system("pause");    return 0;}