原来直觉以为线程Thread1中创建的线程Thread2是子线程，如果Thread1结束，Thread2也会结束，但是实际并不是，如下面的例子

DWORD WINAPI  Thread2(LPVOID p);

DWORD WINAPI  Thread1(LPVOID p)
{
	HANDLE htest = CreateThread(NULL, 0, Thread2, NULL, 0, NULL);

	int i = 0;
	while (i < 6)
	{
		cout << endl;
		cout << "--------------Thread1-----------------" << endl;
		Sleep(1000);
		i++;
	}

	return 0;

}

DWORD WINAPI  Thread2(LPVOID p)
{
	while (true)
	{
		cout << endl;
		cout << "--------------Thread2---------------" << endl;
		Sleep(1000);
	}

	return 0;
}

int main()
{

	CreateThread(NULL, 0, Thread1, NULL, 0, NULL);

输出如下，当Thread1结束后，Thread2还在一直的执行

--------------Thread1-----------------

--------------Thread2---------------

--------------Thread1-------------------------------Thread2---------------

--------------Thread1-----------------

--------------Thread2---------------

--------------Thread1-----------------

--------------Thread2---------------

--------------Thread2---------------

--------------Thread1-----------------

--------------Thread1-----------------

--------------Thread2---------------

--------------Thread2---------------

--------------Thread2---------------

--------------Thread2---------------

--------------Thread2---------------

--------------Thread2---------------

--------------Thread2---------------

--------------Thread2---------------

--------------Thread2---------------