gcc/ada/a-reatim.ads

   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 --                                                                          --
  10 --          Copyright (C) 1992-2001 Free Software Foundation, Inc.          --
  11 --                                                                          --
  12 -- This specification is derived from the Ada Reference Manual for use with --
  13 -- GNAT. The copyright notice above, and the license provisions that follow --
  14 -- apply solely to the  contents of the part following the private keyword. --
  15 --                                                                          --
  16 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  17 -- terms of the  GNU General Public License as published  by the Free Soft- --
  18 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  19 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  20 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  21 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  22 -- for  more details.  You should have  received  a copy of the GNU General --
  23 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  24 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  25 -- MA 02111-1307, USA.                                                      --
  26 --                                                                          --
  27 -- As a special exception,  if other files  instantiate  generics from this --
  28 -- unit, or you link  this unit with other files  to produce an executable, --
  29 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  30 -- covered  by the  GNU  General  Public  License.  This exception does not --
  31 -- however invalidate  any other reasons why  the executable file  might be --
  32 -- covered by the  GNU Public License.                                      --
  33 --                                                                          --
  34 -- GNAT was originally developed  by the GNAT team at  New York University. --
  35 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  36 --                                                                          --
  37 ------------------------------------------------------------------------------
  38
  39 with System.Task_Primitives.Operations;
  40 pragma Elaborate_All (System.Task_Primitives.Operations);
  41
  42 package Ada.Real_Time is
  43
  44    type Time is private;
  45    Time_First : constant Time;
  46    Time_Last  : constant Time;
  47    Time_Unit  : constant := 10#1.0#E-9;
  48
  49    type Time_Span is private;
  50    Time_Span_First : constant Time_Span;
  51    Time_Span_Last  :  constant Time_Span;
  52    Time_Span_Zero  :  constant Time_Span;
  53    Time_Span_Unit  :  constant Time_Span;
  54
  55    Tick : constant Time_Span;
  56    function Clock return Time;
  57
  58    function "+"  (Left : Time;      Right : Time_Span) return Time;
  59    function "+"  (Left : Time_Span; Right : Time)      return Time;
  60    function "-"  (Left : Time;      Right : Time_Span) return Time;
  61    function "-"  (Left : Time;      Right : Time)      return Time_Span;
  62
  63    function "<"  (Left, Right : Time) return Boolean;
  64    function "<=" (Left, Right : Time) return Boolean;
  65    function ">"  (Left, Right : Time) return Boolean;
  66    function ">=" (Left, Right : Time) return Boolean;
  67
  68    function "+"  (Left, Right : Time_Span)             return Time_Span;
  69    function "-"  (Left, Right : Time_Span)             return Time_Span;
  70    function "-"  (Right : Time_Span)                   return Time_Span;
  71    function "*"  (Left : Time_Span; Right : Integer)   return Time_Span;
  72    function "*"  (Left : Integer;   Right : Time_Span) return Time_Span;
  73    function "/"  (Left, Right : Time_Span)             return Integer;
  74    function "/"  (Left : Time_Span; Right : Integer)   return Time_Span;
  75
  76    function "abs" (Right : Time_Span) return Time_Span;
  77
  78    function "<"  (Left, Right : Time_Span) return Boolean;
  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
  83    function To_Duration  (TS : Time_Span) return Duration;
  84    function To_Time_Span (D : Duration)   return Time_Span;
  85
  86    function Nanoseconds  (NS : Integer) return Time_Span;
  87    function Microseconds (US : Integer) return Time_Span;
  88    function Milliseconds (MS : Integer) return Time_Span;
  89
  90    --  Seconds_Count needs 64 bits, since Time has the full range of
  91    --  Duration. The delta of Duration is 10 ** (-9), so the maximum
  92    --  number of seconds is 2**63/10**9 = 8*10**9 which does not quite
  93    --  fit in 32 bits.
  94
  95    type Seconds_Count is range -2 ** 63 .. 2 ** 63 - 1;
  96
  97    procedure Split (T : Time; SC : out Seconds_Count; TS : out Time_Span);
  98    function Time_Of (SC : Seconds_Count; TS : Time_Span) return Time;
  99
 100 private
 101    type Time is new Duration;
 102
 103    Time_First : constant Time := Time'First;
 104
 105    Time_Last  : constant Time := Time'Last;
 106
 107    type Time_Span is new Duration;
 108
 109    Time_Span_First : constant Time_Span := Time_Span'First;
 110
 111    Time_Span_Last  : constant Time_Span := Time_Span'Last;
 112
 113    Time_Span_Zero  : constant Time_Span := 0.0;
 114
 115    Time_Span_Unit  : constant Time_Span := 10#1.0#E-9;
 116
 117    Tick : constant Time_Span :=
 118             Time_Span (System.Task_Primitives.Operations.RT_Resolution);
 119
 120    --  Time and Time_Span are represented in 64-bit Duration value in
 121    --  in nanoseconds. For example, 1 second and 1 nanosecond is
 122    --  represented as the stored integer 1_000_000_001.
 123
 124    pragma Import (Intrinsic, "<");
 125    pragma Import (Intrinsic, "<=");
 126    pragma Import (Intrinsic, ">");
 127    pragma Import (Intrinsic, ">=");
 128    pragma Import (Intrinsic, "abs");
 129
 130 end Ada.Real_Time;