|Microsoft DirectX 9.0|
The Lock method locks the critical section object.
This method calls the Microsoft® Win32® EnterCriticalSection method.
Call the CCritSec::Unlock member function to unlock the critical section. You can make multiple calls to the Lock method on the same thread; be sure to call Unlock a corresponding number of times.
If the object is already locked by another thread, the CCritSec::Lock method blocks until the object is released, or until a possible-deadlock exception occurs.