關於同一線程兩次調用EnterCriticalSection的測試

#include "stdafx.h"
#include <iostream>
using namespace std;
#include <windows.h>
#include <process.h>
CRITICAL_SECTION cs;

//1.測試同一線程兩次EnterCriticalSection會不會阻塞
//答案:不會
/*
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.測試同一線程兩次EnterCriticalSection，調用一次LeaveCriticalSection 另一個線程是否可以以EnterCriticalSection
//答案:不可以 兩次EnterCriticalSection 必須調用 LeaveCriticalSection兩次
unsigned  __stdcall ThreadPorc ( void * )
{
    for(int i = 0;i<20;i++)
    {
        EnterCriticalSection(&cs);
        cout<<"線程2進入"<<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;
}