C++ Semaphore, limit 2 instances at the same time

[eclessiastes]

Hello
I'm trying to make a loop create 10 threads but only 2 working threads at the same time, wait until one finish the job then start another thread but never exceed 2 at same time. I'm doing this with semaphores.

#include <iostream>
#include <Windows.h>

typedef struct structure1 { int threadnr; } structure1;

HANDLE ghSemaphore = CreateSemaphore(NULL, 2, 2, NULL);

DWORD WINAPI ThreadProc(LPVOID param)
{
	structure1 * t1 = (structure1 *)param;
	printf("Thread %i\n",t1->threadnr);
	Sleep(1000);
	return 0;
}

int main()
{
	for (int i = 0; i < 10; i++)
	{
		WaitForSingleObject(ghSemaphore, INFINITE);
		structure1 * t1 = new structure1;
		t1->threadnr = i;
		CreateThread(NULL, 0, ThreadProc, t1, NULL, NULL);
		ReleaseSemaphore(ghSemaphore, 1, 0);
	}
	system("PAUSE");
	return 0;
}

I set the semaphore max value at 2 but it start all threads at same time instead of only 2.
I tried to set WaitForSingleObject at the beginning of ThreadProc and ReleaseSemaphore at the end and it works but it will create all threads in buffer. I want to create just 2 at same time and wait for one to finish then start another one
Any idea ?
Thank you