SignalObjectAndWait

http://msdn.microsoft.com/en-us/library/ms686293(VS.85).aspx

So far, I haven't used this API because it only handles kernel objects.
In general, most programmers prefer using a user-mode lock object instead of kernel objects.
(e.g. critical section, slim rw lock)

By the way, in case of using multiple kernel objects, this API is very useful for performance.