C++ semaphore count seems not work

[henry1999sg]

I create a semaphore and use ReleaseSemaphore to check the previous count. but everytime I got 0.

any clue ?

HANDLE hSemaphore = CreateSemaphore(NULL, 0,10, "My Semaphore Name"); 
dwWaitResult = WaitForSingleObject(
        hSemaphore,   // handle to semaphore
        tmout);      
	
LONG prev_counter; 
bool ret;
ret=ReleaseSemaphore(hSemaphore, incnt, &prev_counter); 
if(ret)		std::cout<<"prev_counter="<<prev_counter<<std::endl;

ret=ReleaseSemaphore(hSemaphore, incnt, &prev_counter); 
if(ret)		std::cout<<"prev_counter="<<prev_counter<<std::endl;