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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --          A D A . R E A L _ T I M E . T I M I N G _ E V E N T S           --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --           Copyright (C) 2005-2019, Free Software Foundation, Inc.        --
  10 --                                                                          --
  11 -- This specification is derived from the Ada Reference Manual for use with --
  12 -- GNAT. The copyright notice above, and the license provisions that follow --
  13 -- apply solely to the  contents of the part following the private keyword. --
  14 --                                                                          --
  15 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  16 -- terms of the  GNU General Public License as published  by the Free Soft- --
  17 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  18 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  19 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  20 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  21 --                                                                          --
  22 -- As a special exception under Section 7 of GPL version 3, you are granted --
  23 -- additional permissions described in the GCC Runtime Library Exception,   --
  24 -- version 3.1, as published by the Free Software Foundation.               --
  25 --                                                                          --
  26 -- You should have received a copy of the GNU General Public License and    --
  27 -- a copy of the GCC Runtime Library Exception along with this program;     --
  28 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  29 -- <http://www.gnu.org/licenses/>.                                          --
  30 --                                                                          --
  31 -- GNAT was originally developed  by the GNAT team at  New York University. --
  32 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 with Ada.Finalization;
  37
  38 package Ada.Real_Time.Timing_Events is
  39
  40    type Timing_Event is tagged limited private;
  41
  42    type Timing_Event_Handler
  43      is access protected procedure (Event : in out Timing_Event);
  44
  45    procedure Set_Handler
  46      (Event   : in out Timing_Event;
  47       At_Time : Time;
  48       Handler : Timing_Event_Handler);
  49
  50    procedure Set_Handler
  51      (Event   : in out Timing_Event;
  52       In_Time : Time_Span;
  53       Handler : Timing_Event_Handler);
  54
  55    function Current_Handler
  56      (Event : Timing_Event) return Timing_Event_Handler;
  57
  58    procedure Cancel_Handler
  59      (Event     : in out Timing_Event;
  60       Cancelled : out Boolean);
  61
  62    function Time_Of_Event (Event : Timing_Event) return Time;
  63
  64 private
  65
  66    type Timing_Event is new Ada.Finalization.Limited_Controlled with record
  67       Timeout : Time := Time_First;
  68       --  The time at which the user's handler should be invoked when the
  69       --  event is "set" (i.e., when Handler is not null).
  70
  71       Handler : Timing_Event_Handler;
  72       --  An access value designating the protected procedure to be invoked
  73       --  at the Timeout time in the future.  When this value is null the event
  74       --  is said to be "cleared" and no timeout is processed.
  75    end record;
  76
  77    overriding procedure Finalize (This : in out Timing_Event);
  78    --  Finalization procedure is required to satisfy (RM D.15 (19/2)), which
  79    --  says that the object must be cleared on finalization.
  80
  81 end Ada.Real_Time.Timing_Events;