线程同步技术一:Critical Section的使用

critical section 称为代码关键段或者临界区域，它并不是核心对象，不是属于操作系统维护的而是属于进程维护的，用它可以解决多线程同步技术。代码如下:控制台程序模拟卖票系统

#include <windows.h>#include <iostream>using namespace std;DWORD WINAPI Fun1Proc( LPVOID lpParameter // thread data );DWORD WINAPI Fun2Proc( LPVOID lpParameter // thread data );int index=0;int tickets=100;CRITICAL_SECTION critical_sec; //定义关键区域void main(){HANDLE hThread1;HANDLE hThread2;InitializeCriticalSection(&critical_sec); //初始化关键区域hThread1=CreateThread(NULL,0,Fun1Proc,NULL,0,NULL);hThread2=CreateThread(NULL,0,Fun2Proc,NULL,0,NULL);CloseHandle(hThread1);CloseHandle(hThread2);Sleep(4000);}DWORD WINAPI Fun1Proc( LPVOID lpParameter // thread data ){while(TRUE){ EnterCriticalSection(&critical_sec); //进入关键代码区域if(tickets>0){Sleep(1);cout<<"thread1 sell ticket : "<<tickets--<<endl;}elsebreak;LeaveCriticalSection(&critical_sec); //离开代码关键区域}return 0;}DWORD WINAPI Fun2Proc( LPVOID lpParameter // thread data ){while(TRUE){EnterCriticalSection(&critical_sec); //进入关键代码区域if(tickets>0){Sleep(1);cout<<"thread2 sell ticket : "<<tickets--<<endl;}elsebreak;LeaveCriticalSection(&critical_sec); //离开代码关键区域}return 0;}

 

主要使用的几个函数是:InitializeCriticalSection(&critical_sec);

                               EnterCriticalSection(&critical_sec);

                               LeaveCriticalSection(&critical_sec);