[C++] socket - 6 [API互斥事件对象实现线程同步]

/*API互斥事件对象实现线程同步*/
#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=;
HANDLE hmutex;//互斥事件对象
int main()
{
    HANDLE h1,h2;//定义句柄变量
    hmutex=::CreateMutex(NULL,FALSE,NULL);//创建互斥事件并返回其句柄
    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();
    return ;
}
DWORD WINAPI myfun1(LPVOID lpParameter)//线程函数
{
    while()
    {
        ::WaitForSingleObject(hmutex,INFINITE);//请求互斥事件
        if(a<)
        {
            ::Sleep();
            a+=;
            printf("线程1：%d\r\n",a);
            ::ReleaseMutex(hmutex);
        }
        else
        {
            ::ReleaseMutex(hmutex);//释放互斥事件句柄
            break;
        }
    }
    return ;
}
DWORD WINAPI myfun2(LPVOID lpParameter)
{
    while()
    {
        ::WaitForSingleObject(hmutex,INFINITE);//请求事件对象
        if(a<)
        {
            ::Sleep();
            a+=;
            printf("线程2：%d\r\n",a);
            ::ReleaseMutex(hmutex);
        }
        else
        {
            ::ReleaseMutex(hmutex);
            break;
        }
    }
    return ;
}