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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- A D A . R E A L _ T I M E . T I M I N G _ E V E N T S --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 2005-2017, Free Software Foundation, Inc. --
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10 -- --
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11 -- This specification is derived from the Ada Reference Manual for use with --
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12 -- GNAT. The copyright notice above, and the license provisions that follow --
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13 -- apply solely to the contents of the part following the private keyword. --
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14 -- --
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15 -- GNAT is free software; you can redistribute it and/or modify it under --
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16 -- terms of the GNU General Public License as published by the Free Soft- --
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17 -- ware Foundation; either version 3, or (at your option) any later ver- --
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18 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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19 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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20 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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21 -- --
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22 -- As a special exception under Section 7 of GPL version 3, you are granted --
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23 -- additional permissions described in the GCC Runtime Library Exception, --
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24 -- version 3.1, as published by the Free Software Foundation. --
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25 -- --
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26 -- You should have received a copy of the GNU General Public License and --
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27 -- a copy of the GCC Runtime Library Exception along with this program; --
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28 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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29 -- <http://www.gnu.org/licenses/>. --
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30 -- --
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31 -- GNAT was originally developed by the GNAT team at New York University. --
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32 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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33 -- --
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34 ------------------------------------------------------------------------------
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35
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36 with Ada.Finalization;
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37
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38 package Ada.Real_Time.Timing_Events is
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39
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40 type Timing_Event is tagged limited private;
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41
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42 type Timing_Event_Handler
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43 is access protected procedure (Event : in out Timing_Event);
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44
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45 procedure Set_Handler
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46 (Event : in out Timing_Event;
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47 At_Time : Time;
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48 Handler : Timing_Event_Handler);
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49
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50 procedure Set_Handler
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51 (Event : in out Timing_Event;
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52 In_Time : Time_Span;
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53 Handler : Timing_Event_Handler);
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54
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55 function Current_Handler
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56 (Event : Timing_Event) return Timing_Event_Handler;
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57
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58 procedure Cancel_Handler
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59 (Event : in out Timing_Event;
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60 Cancelled : out Boolean);
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61
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62 function Time_Of_Event (Event : Timing_Event) return Time;
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63
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64 private
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65
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66 type Timing_Event is new Ada.Finalization.Limited_Controlled with record
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67 Timeout : Time := Time_First;
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68 -- The time at which the user's handler should be invoked when the
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69 -- event is "set" (i.e., when Handler is not null).
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70
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71 Handler : Timing_Event_Handler;
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72 -- An access value designating the protected procedure to be invoked
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73 -- at the Timeout time in the future. When this value is null the event
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74 -- is said to be "cleared" and no timeout is processed.
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75 end record;
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76
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77 overriding procedure Finalize (This : in out Timing_Event);
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78 -- Finalization procedure is required to satisfy (RM D.15 (19/2)), which
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79 -- says that the object must be cleared on finalization.
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80
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81 end Ada.Real_Time.Timing_Events;
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