--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnarl/a-etgrbu.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,110 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUN-TIME COMPONENTS                         --
+--                                                                          --
+--      A D A . E X E C U T I O N _ T I M E . G R O U P _ B U D G E T S     --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--            Copyright (C) 2015-2017, 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/>.                                          --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This unit is not implemented in typical GNAT implementations that lie on
+--  top of operating systems, because it is infeasible to implement in such
+--  environments.
+
+--  If a target environment provides appropriate support for this package,
+--  then the Unimplemented_Unit pragma should be removed from this spec and
+--  an appropriate body provided.
+
+with System;
+with System.Multiprocessors;
+
+package Ada.Execution_Time.Group_Budgets is
+   pragma Unimplemented_Unit;
+
+   type Group_Budget
+     (CPU : System.Multiprocessors.CPU := System.Multiprocessors.CPU'First)
+   is tagged limited private;
+
+   type Group_Budget_Handler is access
+      protected procedure (GB : in out Group_Budget);
+
+   type Task_Array is
+      array (Positive range <>) of Ada.Task_Identification.Task_Id;
+
+   Min_Handler_Ceiling : constant System.Any_Priority :=
+                           System.Any_Priority'First;
+   --  Initial value is an arbitrary choice ???
+
+   procedure Add_Task
+     (GB : in out Group_Budget;
+      T  : Ada.Task_Identification.Task_Id);
+
+   procedure Remove_Task
+     (GB : in out Group_Budget;
+      T  : Ada.Task_Identification.Task_Id);
+
+   function Is_Member
+     (GB : Group_Budget;
+      T  : Ada.Task_Identification.Task_Id) return Boolean;
+
+   function Is_A_Group_Member
+     (T : Ada.Task_Identification.Task_Id) return Boolean;
+
+   function Members (GB : Group_Budget) return Task_Array;
+
+   procedure Replenish
+     (GB : in out Group_Budget;
+      To : Ada.Real_Time.Time_Span);
+
+   procedure Add
+     (GB       : in out Group_Budget;
+      Interval : Ada.Real_Time.Time_Span);
+
+   function Budget_Has_Expired (GB : Group_Budget) return Boolean;
+
+   function Budget_Remaining
+     (GB : Group_Budget) return Ada.Real_Time.Time_Span;
+
+   procedure Set_Handler
+     (GB      : in out Group_Budget;
+      Handler : Group_Budget_Handler);
+
+   function Current_Handler (GB : Group_Budget) return Group_Budget_Handler;
+
+   procedure Cancel_Handler
+     (GB        : in out Group_Budget;
+      Cancelled : out Boolean);
+
+   Group_Budget_Error : exception;
+
+private
+   type Group_Budget
+     (CPU : System.Multiprocessors.CPU := System.Multiprocessors.CPU'First)
+   is tagged limited null record;
+end Ada.Execution_Time.Group_Budgets;