why does this program does not end the thread created??

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C++

hi all,
the simple program below will create two threads using CreateThread API and then simply returns from the thread depending on the simple flag but two thread created will not be ended if i view the handles in process explorer

<br />
<br />
bool killthread1 = false,killthread2=false;<br />
void thread1()<br />
{<br />
        while(1)<br />
	{<br />
		if (killthread1)<br />
		{<br />
			printf("thread1 killed\n");<br />
			return;<br />
		}<br />
	}<br />
}<br />
<br />
void thread2()<br />
{<br />
	while(1)<br />
	{<br />
		if (killthread2)<br />
		{<br />
			printf("thread2 killed\n");<br />
			return;<br />
		}<br />
	}<br />
}<br />
<br />
int _tmain(int argc, _TCHAR* argv[])<br />
{<br />
	HANDLE th1 = CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)(thread1),NULL,0,0);<br />
	HANDLE th2 = CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)(thread2),NULL,0,0);<br />
	getch();<br />
	killthread1=killthread2=true;<br />
	getch();<br />
	return 0;<br />
}<br />

In debug mode visual studio shows that 2 threads are ended before executing return 0, but "process explorer" shows they are alive, what is wrong in this??