[RM D.7] This restriction is a declaration that any protected entry compiled in the scope of the restriction has at most the specified number of tasks waiting on the entry at any one time, and so no queue is required. Note that this restriction is checked at run time. Violation of this restriction results in the raising of Program_Error exception at the point of the call.
The restriction Max_Entry_Queue_Depth is recognized as a
synonym for Max_Entry_Queue_Length. This is retained for historical
compatibility purposes (and a warning will be generated for its use if
warnings on obsolescent features are activated).