[C++] socket - 4 [线程同步 简单例子]

/*WINAPI 线程同步*/
#include<windows.h>
#include<stdio.h>
DWORD WINAPI myfun1(LPVOID lpParameter);//声明线程函数
DWORD WINAPI myfun2(LPVOID lpParameter);
static int a=;
CRITICAL_SECTION Section;
int main()
{
    HANDLE h1,h2;//定义句柄变量
    InitializeCriticalSection(&Section);
    h1=::CreateThread(NULL,,myfun1,NULL,,NULL);//创建线程1
    printf("线程1开始运行！\r\n");
    h2=::CreateThread(NULL,,myfun2,NULL,,NULL);//创建线程2
    printf("线程2开始运行！\t\n");
    ::CloseHandle(h1);//关闭线程句柄对象
    ::CloseHandle(h2);
    ::Sleep();
    printf("正常退出请按'q'\r\n");
    if(getchar()=='q')
    {
        DeleteCriticalSection(&Section);
    }
    else
    {
        return ;
    }
}
DWORD WINAPI myfun1(LPVOID lpParameter)//线程函数
{
    while()
    {
        EnterCriticalSection(&Section);
        a++;
        if(a<)
        {
            printf("线程1正在计数%d\r\n",a);
            LeaveCriticalSection(&Section);
            ::Sleep();
        }
        else
        {
            LeaveCriticalSection(&Section);
            break;
        }
    }
    return ;
}
DWORD WINAPI myfun2(LPVOID lpParameter)
{
    while()
    {
        EnterCriticalSection(&Section);
        a++;
        if(a<)
        {
            printf("线程2正在计数%d\r\n",a);
            LeaveCriticalSection(&Section);
            ::Sleep();
        }
        else
        {
            LeaveCriticalSection(&Section);
            break;
        }
    }
    return ;
}