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+------------------------------------------------------------------------------
+-- --
+-- GNAT LIBRARY COMPONENTS --
+-- --
+-- ADA.CONTAINERS.UNBOUNDED_SYNCHRONIZED_QUEUES --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 2011, Free Software Foundation, Inc. --
+-- --
+-- This specification is derived from the Ada Reference Manual for use with --
+-- GNAT. The copyright notice above, and the license provisions that follow --
+-- apply solely to the contents of the part following the private keyword. --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- This unit was originally developed by Matthew J Heaney. --
+------------------------------------------------------------------------------
+
+with System;
+with Ada.Containers.Synchronized_Queue_Interfaces;
+with Ada.Finalization;
+
+generic
+ with package Queue_Interfaces is
+ new Ada.Containers.Synchronized_Queue_Interfaces (<>);
+
+ Default_Ceiling : System.Any_Priority := System.Priority'Last;
+
+package Ada.Containers.Unbounded_Synchronized_Queues is
+ pragma Preelaborate;
+
+ package Implementation is
+
+ -- All identifiers in this unit are implementation defined
+
+ pragma Implementation_Defined;
+
+ type List_Type is tagged limited private;
+
+ procedure Enqueue
+ (List : in out List_Type;
+ New_Item : Queue_Interfaces.Element_Type);
+
+ procedure Dequeue
+ (List : in out List_Type;
+ Element : out Queue_Interfaces.Element_Type);
+
+ function Length (List : List_Type) return Count_Type;
+
+ function Max_Length (List : List_Type) return Count_Type;
+
+ private
+
+ type Node_Type;
+ type Node_Access is access Node_Type;
+
+ type Node_Type is limited record
+ Element : Queue_Interfaces.Element_Type;
+ Next : Node_Access;
+ end record;
+
+ type List_Type is new Ada.Finalization.Limited_Controlled with record
+ First, Last : Node_Access;
+ Length : Count_Type := 0;
+ Max_Length : Count_Type := 0;
+ end record;
+
+ overriding
+ procedure Finalize (List : in out List_Type);
+
+ end Implementation;
+
+ protected type Queue (Ceiling : System.Any_Priority := Default_Ceiling)
+ with Priority => Ceiling is new Queue_Interfaces.Queue with
+
+ overriding
+ entry Enqueue (New_Item : Queue_Interfaces.Element_Type);
+
+ overriding
+ entry Dequeue (Element : out Queue_Interfaces.Element_Type);
+
+ overriding
+ function Current_Use return Count_Type;
+
+ overriding
+ function Peak_Use return Count_Type;
+
+ private
+
+ List : Implementation.List_Type;
+
+ end Queue;
+
+end Ada.Containers.Unbounded_Synchronized_Queues;