--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/a-cusyqu.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,106 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT LIBRARY COMPONENTS                          --
+--                                                                          --
+--               ADA.CONTAINERS.UNBOUNDED_SYNCHRONIZED_QUEUES               --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 2011-2017, 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 Annotate (CodePeer, Skip_Analysis);
+   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;