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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                         A D A . R E A L _ T I M E                        --
   6 --                                                                          --
   7 --                                  S p e c                                 --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2015, 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 System.Task_Primitives.Operations;
  37 pragma Elaborate_All (System.Task_Primitives.Operations);
  38
  39 package Ada.Real_Time is
  40
  41    pragma Compile_Time_Error
  42      (Duration'Size /= 64,
  43       "this version of Ada.Real_Time requires 64-bit Duration");
  44
  45    type Time is private;
  46    Time_First : constant Time;
  47    Time_Last  : constant Time;
  48    Time_Unit  : constant := 10#1.0#E-9;
  49
  50    type Time_Span is private;
  51    Time_Span_First : constant Time_Span;
  52    Time_Span_Last  : constant Time_Span;
  53    Time_Span_Zero  : constant Time_Span;
  54    Time_Span_Unit  : constant Time_Span;
  55
  56    Tick : constant Time_Span;
  57    function Clock return Time;
  58
  59    function "+"  (Left : Time;      Right : Time_Span) return Time;
  60    function "+"  (Left : Time_Span; Right : Time)      return Time;
  61    function "-"  (Left : Time;      Right : Time_Span) return Time;
  62    function "-"  (Left : Time;      Right : Time)      return Time_Span;
  63
  64    function "<"  (Left, Right : Time) return Boolean;
  65    function "<=" (Left, Right : Time) return Boolean;
  66    function ">"  (Left, Right : Time) return Boolean;
  67    function ">=" (Left, Right : Time) return Boolean;
  68
  69    function "+"  (Left, Right : Time_Span)             return Time_Span;
  70    function "-"  (Left, Right : Time_Span)             return Time_Span;
  71    function "-"  (Right : Time_Span)                   return Time_Span;
  72    function "*"  (Left : Time_Span; Right : Integer)   return Time_Span;
  73    function "*"  (Left : Integer;   Right : Time_Span) return Time_Span;
  74    function "/"  (Left, Right : Time_Span)             return Integer;
  75    function "/"  (Left : Time_Span; Right : Integer)   return Time_Span;
  76
  77    function "abs" (Right : Time_Span) return Time_Span;
  78
  79    function "<"  (Left, Right : Time_Span) return Boolean;
  80    function "<=" (Left, Right : Time_Span) return Boolean;
  81    function ">"  (Left, Right : Time_Span) return Boolean;
  82    function ">=" (Left, Right : Time_Span) return Boolean;
  83
  84    function To_Duration  (TS : Time_Span) return Duration;
  85    function To_Time_Span (D : Duration)   return Time_Span;
  86
  87    function Nanoseconds  (NS : Integer) return Time_Span;
  88    function Microseconds (US : Integer) return Time_Span;
  89    function Milliseconds (MS : Integer) return Time_Span;
  90
  91    function Seconds (S : Integer) return Time_Span;
  92    pragma Ada_05 (Seconds);
  93
  94    function Minutes (M : Integer) return Time_Span;
  95    pragma Ada_05 (Minutes);
  96
  97    type Seconds_Count is new Long_Long_Integer;
  98    --  Seconds_Count needs 64 bits, since the type Time has the full range of
  99    --  Duration. The delta of Duration is 10 ** (-9), so the maximum number of
 100    --  seconds is 2**63/10**9 = 8*10**9 which does not quite fit in 32 bits.
 101    --  However, rather than make this explicitly 64-bits we derive from
 102    --  Long_Long_Integer. In normal usage this will have the same effect. But
 103    --  in the case of CodePeer with a target configuration file with a maximum
 104    --  integer size of 32, it allows analysis of this unit.
 105
 106    procedure Split (T : Time; SC : out Seconds_Count; TS : out Time_Span);
 107    function Time_Of (SC : Seconds_Count; TS : Time_Span) return Time;
 108
 109 private
 110    --  Time and Time_Span are represented in 64-bit Duration value in
 111    --  nanoseconds. For example, 1 second and 1 nanosecond is represented
 112    --  as the stored integer 1_000_000_001. This is for the 64-bit Duration
 113    --  case, not clear if this also is used for 32-bit Duration values.
 114
 115    type Time is new Duration;
 116
 117    Time_First : constant Time := Time'First;
 118
 119    Time_Last  : constant Time := Time'Last;
 120
 121    type Time_Span is new Duration;
 122
 123    Time_Span_First : constant Time_Span := Time_Span'First;
 124
 125    Time_Span_Last  : constant Time_Span := Time_Span'Last;
 126
 127    Time_Span_Zero  : constant Time_Span := 0.0;
 128
 129    Time_Span_Unit  : constant Time_Span := 10#1.0#E-9;
 130
 131    Tick : constant Time_Span :=
 132             Time_Span (System.Task_Primitives.Operations.RT_Resolution);
 133
 134    pragma Import (Intrinsic, "<");
 135    pragma Import (Intrinsic, "<=");
 136    pragma Import (Intrinsic, ">");
 137    pragma Import (Intrinsic, ">=");
 138    pragma Import (Intrinsic, "abs");
 139
 140    pragma Inline (Microseconds);
 141    pragma Inline (Milliseconds);
 142    pragma Inline (Nanoseconds);
 143    pragma Inline (Seconds);
 144    pragma Inline (Minutes);
 145
 146 end Ada.Real_Time;