线程同步--关键代码段

 

#include <windows.h>
#include <iostream.h>

//线程入口函数声明
DWORD WINAPI Fun1Proc(
                        LPVOID lpParameter   // thread data
                        );

DWORD WINAPI Fun2Proc(
                        LPVOID lpParameter   // thread data
                        );

int tickets = 100;  //票数
CRITICAL_SECTION g_cs;

void main()
{
    //线程句柄
    HANDLE hThread1;
    HANDLE hThread2;

    //创建线程
    hThread1 = CreateThread(NULL, 0, Fun1Proc, NULL, 0, NULL);
    hThread2 = CreateThread(NULL, 0, Fun2Proc, NULL, 0, NULL);

    //关闭线程句柄，因为主线程不需要再对线程操作
    CloseHandle(hThread1);
    CloseHandle(hThread2);

    //初始化关键代码段
    InitializeCriticalSection(&g_cs);

    //让主线程休眠4秒
    Sleep(4000);

    //删除关键代码段
    DeleteCriticalSection(&g_cs);
}


//线程1的入口函数
DWORD WINAPI Fun1Proc(LPVOID lpParameter)
{
    while(TRUE)
    {
        EnterCriticalSection(&g_cs);
        if( tickets>0)
        {
            Sleep(1);
            cout<<"thread1 sell ticket: "<<tickets--<<endl;
            LeaveCriticalSection(&g_cs);
        }
        else
        {
            LeaveCriticalSection(&g_cs);
            break;
        }
    }
    return 0;
}



//线程2的入口函数
DWORD WINAPI Fun2Proc(LPVOID lpParameter)
{
    while(TRUE)
    {
        EnterCriticalSection(&g_cs);
        if( tickets>0)
        {
            Sleep(1);
            cout<<"thread2 sell ticket: "<<tickets--<<endl;
            LeaveCriticalSection(&g_cs);
        }
        else
        {
            LeaveCriticalSection(&g_cs);
            break;
        }
    }
    return 0;
}