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+------------------------------------------------------------------------------
+--                                                                          --
+--                         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                                  --
+--                                                                          --
+-- This specification is derived from the Ada Reference Manual for use with --
+-- GNAT.  In accordance with the copyright of that document, you can freely --
+-- copy and modify this specification,  provided that if you redistribute a --
+-- modified version,  any changes that you have made are clearly indicated. --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  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;
+
+package Ada.Execution_Time.Group_Budgets is
+   pragma Preelaborate;
+
+   pragma Unimplemented_Unit;
+
+   type Group_Budget 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 is tagged limited null record;
+end Ada.Execution_Time.Group_Budgets;