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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --             A D A . E X E C U T I O N _ T I M E . T I M E R S            --
   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 System;
  25
  26 package Ada.Execution_Time.Timers is
  27    pragma Preelaborate;
  28
  29    pragma Unimplemented_Unit;
  30
  31    type Timer (T : not null access constant Ada.Task_Identification.Task_Id) is
  32       tagged limited private;
  33
  34    type Timer_Handler is access protected procedure (TM : in out Timer);
  35
  36    Min_Handler_Ceiling : constant System.Any_Priority := System.Priority'Last;
  37
  38    procedure Set_Handler
  39      (TM      : in out Timer;
  40       In_Time : Ada.Real_Time.Time_Span;
  41       Handler : Timer_Handler);
  42
  43    procedure Set_Handler
  44      (TM      : in out Timer;
  45       At_Time : CPU_Time;
  46       Handler : Timer_Handler);
  47
  48    function Current_Handler (TM : Timer) return Timer_Handler;
  49
  50    procedure Cancel_Handler
  51      (TM        : in out Timer;
  52       Cancelled : out Boolean);
  53
  54    function Time_Remaining (TM : Timer) return Ada.Real_Time.Time_Span;
  55
  56    Timer_Resource_Error : exception;
  57
  58 private
  59    type Timer (T : access Ada.Task_Identification.Task_Id) is
  60       tagged limited null record;
  61 end Ada.Execution_Time.Timers;