File : a-disedf.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                  A D A . D I S P A T C H I N G . E D F                   --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 -- This specification is derived from the Ada Reference Manual for use with --
  10 -- GNAT.  In accordance with the copyright of that document, you can freely --
  11 -- copy and modify this specification,  provided that if you redistribute a --
  12 -- modified version,  any changes that you have made are clearly indicated. --
  13 --                                                                          --
  14 ------------------------------------------------------------------------------
  15 
  16 --  This unit is not implemented in typical GNAT implementations that lie on
  17 --  top of operating systems, because it is infeasible to implement in such
  18 --  environments.
  19 
  20 --  If a target environment provides appropriate support for this package,
  21 --  then the Unimplemented_Unit pragma should be removed from this spec and
  22 --  an appropriate body provided.
  23 
  24 with Ada.Real_Time;
  25 with Ada.Task_Identification;
  26 
  27 package Ada.Dispatching.EDF is
  28    pragma Preelaborate;
  29 
  30    pragma Unimplemented_Unit;
  31 
  32    subtype Deadline is Ada.Real_Time.Time;
  33 
  34    Default_Deadline : constant Deadline := Ada.Real_Time.Time_Last;
  35 
  36    procedure Set_Deadline
  37       (D : Deadline;
  38        T : Ada.Task_Identification.Task_Id :=
  39              Ada.Task_Identification.Current_Task);
  40 
  41    procedure Delay_Until_And_Set_Deadline
  42       (Delay_Until_Time : Ada.Real_Time.Time;
  43        Deadline_Offset  : Ada.Real_Time.Time_Span);
  44 
  45    function Get_Deadline
  46       (T : Ada.Task_Identification.Task_Id :=
  47              Ada.Task_Identification.Current_Task)
  48        return Deadline
  49    with
  50      SPARK_Mode,
  51      Volatile_Function,
  52      Global => Ada.Task_Identification.Tasking_State;
  53 
  54 end Ada.Dispatching.EDF;