线程优先级的问题,谁帮帮我..谢谢..

这个程序结果.两个值为什么会不一样呢??
#include<stdio.h>
#include<windows.h>
#include<process.h>
DWORD g1=0;
DWORD g2=0;
BOOL gb=TRUE;
DWORD WINAPI ThreadFunc(LPVOID ipParam);
int main(){
    DWORD u;
    HANDLE h[2];
    h[0]=::CreateThread(NULL,0,ThreadFunc,NULL,CREATE_SUSPENDED,&u);
    ::SetThreadPriority(h[0],THREAD_PRIORITY_IDLE);
    ::ResumeThread(h[0]);
    h[1]=::CreateThread(NULL,0,ThreadFunc,NULL,0,&u);   
    Sleep(1000);
    gb=FALSE;
    ::WaitForMultipleObjects(2,h,TRUE,INFINITE);
    ::CloseHandle(h[0]);
    ::CloseHandle(h[1]);
    printf("终值:%d,%d\n",g1,g2);
    return(0);
}
DWORD WINAPI ThreadFunc(LPVOID ipParam){
    while(gb){
        g1++;
        g2++;   

    }
    printf("%d,%d\n",g1,g2);
    return(0);
}