CRITICAL_SECTION 学习

 

// Critsetion.cpp : 定义控制台应用程序的入口点。

//



#include "stdafx.h"

#include <Windows.h>

#include <iostream>

#include <process.h>

using namespace std;





CRITICAL_SECTION g_cs;

char name[]="zhangdongsheng";



unsigned __stdcall ThreadPoc1( void* pArguments)

{

	while (1)

	{

		EnterCriticalSection(&g_cs); //如果此处不对全局变量name进行加锁

		                             //那么输出结果将有可能出现不一致现象

		memset(name,0,sizeof(name));

		strcpy(name,"Thread1");

		Sleep(600);

		cout<<"Thread1 "<<name<<endl;

		LeaveCriticalSection(&g_cs);

	}



	return 0;

}

unsigned __stdcall ThreadPoc2( void* pArguments)

{

	while(1)

	{

		EnterCriticalSection(&g_cs);

		memset(name,0,sizeof(name));

		strcpy(name,"Thread2");

		Sleep(500);

		cout<<"Thread2 "<<name<<endl;

		LeaveCriticalSection(&g_cs);

	}



	return 0;

}

int _tmain(int argc, _TCHAR* argv[])

{

	InitializeCriticalSection(&g_cs);

	HANDLE hThread1=(HANDLE)_beginthreadex(NULL,0,ThreadPoc1,NULL,0,NULL);

	HANDLE hThread2=(HANDLE)_beginthreadex(NULL,0,ThreadPoc2,NULL,0,NULL);

	CloseHandle(hThread1);

	CloseHandle(hThread2);

	while(1)

	{

		Sleep(500);

	}

	DeleteCriticalSection(&g_cs);

	return 0;

}

不加锁会出现不一致的情况

加锁后：