程序崩溃

Question

#include <windows.h>
#include <iostream.h>DWORD WINAPI ThreadProc(
  LPVOID lpParameter   // thread data
);
int index = 0;
void main()
{
HANDLE hThread1;
hThread1 = CreateThread(NULL,0,ThreadProc,NULL,0,NULL);
CloseHandle(hThread1);
while(index++ < 1000)
     cout<<"main thread is running"<<endl;
// Sleep(10);
    
// return 0;
}DWORD WINAPI ThreadProc(
  LPVOID lpParameter   // thread data
)
{
while(index++ < 1000)
     cout<<" thread1 is running"<<endl;
    return 0;
}这段代码运行起来有时候崩溃，有时候却又正常，这是什么情况的呀？？？
我看不出哪里有问题呀？

Answer 1

有可能主线程退出时，子线程还在运行
main()退出之前调用
WaitForSingleObject(hThread1, Infinite);
CloseHandle(hThread1)

Answer 2

#include "stdafx.h"
#include <windows.h>
#include <iostream.h>DWORD WINAPI ThreadProc(
LPVOID lpParameter   // thread data
);
int index = 0;
CRITICAL_SECTION  critical;void main()
{
InitializeCriticalSection(&critical);
HANDLE hThread1;
hThread1 = CreateThread(NULL,0,ThreadProc,NULL,0,NULL);
CloseHandle(hThread1); EnterCriticalSection(&critical);
int temp = index;
LeaveCriticalSection(&critical); while(temp < 1000)
{
EnterCriticalSection(&critical);
cout<<"main thread is running"<<endl;
index++;
temp = index;
LeaveCriticalSection(&critical);
}
}DWORD WINAPI ThreadProc(
LPVOID lpParameter   // thread data
)
{
EnterCriticalSection(&critical);
int temp = index;
LeaveCriticalSection(&critical); while(temp < 1000)
{
EnterCriticalSection(&critical);
cout<<" thread1 is running"<<endl;
index++;
temp = index;
LeaveCriticalSection(&critical);
}
return 0;
}