代码与《秒杀多线程第三篇 原子操作 Interlocked系列函数》上的一样，下面，我们用互斥器来解决：

#include "stdio.h"
#include "windows.h"

long LoginCount;
HANDLE handle[50];
HANDLE hMutex;

DWORD WINAPI ThreadFunc(void *pm)
{
	Sleep(300);
	WaitForSingleObject(hMutex,INFINITE);
	LoginCount++;
	ReleaseMutex(hMutex);
	return 0;
}
int main()
{
	int num=20;
	while(num--)
	{
		LoginCount=0;
		hMutex=CreateMutex(NULL,FALSE,NULL);
		for(int i=0; i<50; i++)
		{
			handle[i]=CreateThread(NULL,0,ThreadFunc,NULL,0,NULL);
		}
		WaitForMultipleObjects(50,handle,TRUE,INFINITE);
		printf("有%d个用户登录，记录结果是%d\n",50,LoginCount);
	}
	system("pause");
	return 0;
}