This class helps us with a recursive thread lock without using a recursive thread lock. Non_Servant_Upcall has a magic constructor and destructor. We unlock the Object_Adapter lock for the duration of the non-servant (i.e., adapter activator and servant activator) upcalls; reacquiring once the upcalls complete. Even though we are releasing the lock, other threads will not be able to make progress since <Object_Adapter::non_servant_upcall_in_progress_> has been set
Define a table entry that holds an operation name and its corresponding skeleton. A table of such entries is used to initialize the different lookup strategies
