初学多线程的代码，请帮忙看看,该怎么处理

初学多线程的代码，请帮忙看看
#include   <windows.h>
#include   <iostream>
#include   <cstdlib>

using   namespace   std;

DWORD   WINAPI   ThreadProc1(LPVOID   lpParameter);
DWORD   WINAPI   ThreadProc2(LPVOID   lpParameter);

int   index   =   0;
HANDLE   hMutex;

void   main()
{
HANDLE   hThrd1;
HANDLE   hThrd2;
hThrd1   =   CreateThread(NULL,0,ThreadProc1,NULL,0,NULL);
hThrd2   =   CreateThread(NULL,0,ThreadProc2,NULL,0,NULL);
CloseHandle(hThrd1);
CloseHandle(hThrd2);

hMutex   =   CreateMutex(NULL,FALSE,NULL);
Sleep(5000);
}

DWORD   WINAPI   ThreadProc1(LPVOID   lpParameter)
{
while(index++ <10)
{
WaitForSingleObject(hMutex,INFINITE);
cout < < "thread   1   is   running.   index=   " < <index < <endl;
ReleaseMutex(hMutex);
}
return   0;
}

DWORD   WINAPI   ThreadProc2(LPVOID   lpParameter)
{
while(index++ <10)
{
WaitForSingleObject(hMutex,INFINITE);
cout < < "thread   2   is   running.   index=   " < <index < <endl;
ReleaseMutex(hMutex);
}
return   0;
}
为什么线程不是顺序执行，而是按照1   2   2   1   2   1   2   1   1这样的顺序执行，index值也不是1--10这么输出，而是1   2   4   4   5   6   7   8   9   10输出。有谁知道吗？帮帮忙解释一下。谢谢，在线等

------解决方案--------------------
线程的执行顺序是随机的

想将index按照1-10输出要将index在线程内定义
DWORD WINAPI ThreadProc1(LPVOID lpParameter)
{
int index = 0;
while(index++ <10)
{
WaitForSingleObject(hMutex,INFINITE);
cout < < "thread 1 is running. index= " < <index < <endl;
ReleaseMutex(hMutex);
}
return 0;
}

DWORD WINAPI ThreadProc2(LPVOID lpParameter)
{
int index = 0;
while(index++ <10)
{
WaitForSingleObject(hMutex,INFINITE);
cout < < "thread 2 is running. index= " < <index < <endl;
ReleaseMutex(hMutex);
}
return 0;
}

------解决方案--------------------
就如 zottff修改的，关键是CreateMutex的调用时机：
你的代码中：
void main()
{
HANDLE hThrd1;
HANDLE hThrd2;
hThrd1 = CreateThread(NULL,0,ThreadProc1,NULL,0,NULL);
hThrd2 = CreateThread(NULL,0,ThreadProc2,NULL,0,NULL);
CloseHandle(hThrd1);
CloseHandle(hThrd2);

hMutex = CreateMutex(NULL,FALSE,NULL);//这里才调用CreateMutex，此时线程已经创建
Sleep(5000);
}

CreateMutex调用前，hMutex是无效的，WaitForSingleObject(hMutex,INFINITE)立即返回，无法产生同步的作用。

直到CreateMutex被调用，WaitForSingleObject才能阻塞