关于操作系统的c++代码怎么会出现这样的错误？

#define _CRT_RAND_S
#include
#include "semaphore.h"
#include "thread.h"
#include
using namespace std;

Semaphore mutex(1);

unsigned int WINAPI hello(void * param){
unsigned int time = 0;
while(TRUE){
rand_s(&time);
time %= 3000;

    mutex.P();
    cout << GetCurrentThreadId() << " says hello .Sleep: "<< time << "ms"<<endl;
    mutex.V();

    Sleep(time);

}
return 0;

}

#define THREAD_COUNT 3

int main(){

HANDLE hThread[THREAD_COUNT];
int i = 0;
for( i = 0; i < THREAD_COUNT; i++){
    hThread[i] = startThread(hello,NULL);
}

::WaitForMultipleObjects(THREAD_COUNT,hThread,TRUE,INFINITE);
for( i = 0; i < THREAD_COUNT; i++){
    CloseHandle(hThread[i]);
}

return 0;

}

error C2065: 'rand_s' : undeclared identifier
error C2065: '_beginthreadex' : undeclared identifier

可能是软件兼容性的问题，不同系统的支持可能不一样，你找的看看

定义的问题吧，好像是，未定义

rand_s _beginthreadex 这2个是你自己写的函数吗，是否包含头文件