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：