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181 | ------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . R E A L _ T I M E --
-- --
-- S p e c --
-- --
-- Copyright (C) 2001-2023, AdaCore --
-- --
-- This specification is derived from the Ada Reference Manual for use with --
-- GNAT. The copyright notice above, and the license provisions that follow --
-- apply solely to the contents of the part following the private keyword. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- Ravenscar version of this package for generic bare board targets
with System.OS_Interface;
package Ada.Real_Time with
SPARK_Mode,
Abstract_State => (Clock_Time with Synchronous),
Initializes => Clock_Time
is
pragma Assert
(System.OS_Interface.Ticks_Per_Second >= 50_000,
"Ada RM D.8 (30) requires " &
"that Time_Unit shall be less than or equal to 20 microseconds");
type Time is private;
Time_First : constant Time;
Time_Last : constant Time;
Time_Unit : constant := 1.0 / System.OS_Interface.Ticks_Per_Second;
-- The BB platforms use a time stamp counter driven by the system clock,
-- where the duration of the clock tick (Time_Unit) depends on the speed
-- of the underlying hardware. The system clock frequency is used here to
-- determine Time_Unit.
type Time_Span is private;
Time_Span_First : constant Time_Span;
Time_Span_Last : constant Time_Span;
Time_Span_Zero : constant Time_Span;
Time_Span_Unit : constant Time_Span;
Tick : constant Time_Span;
function Clock return Time with
Volatile_Function,
Global => Clock_Time;
function "+" (Left : Time; Right : Time_Span) return Time with
Global => null;
function "-" (Left : Time; Right : Time_Span) return Time with
Global => null;
function "-" (Left : Time; Right : Time) return Time_Span with
Global => null;
function "+" (Left : Time_Span; Right : Time) return Time is
(Right + Left)
with Global => null;
function "<" (Left, Right : Time) return Boolean with
Global => null;
function "<=" (Left, Right : Time) return Boolean with
Global => null;
function ">" (Left, Right : Time) return Boolean with
Global => null;
function ">=" (Left, Right : Time) return Boolean with
Global => null;
function "+" (Left, Right : Time_Span) return Time_Span with
Global => null;
function "-" (Left, Right : Time_Span) return Time_Span with
Global => null;
function "-" (Right : Time_Span) return Time_Span with
Global => null;
function "*" (Left : Time_Span; Right : Integer) return Time_Span with
Global => null;
function "*" (Left : Integer; Right : Time_Span) return Time_Span with
Global => null;
function "/" (Left, Right : Time_Span) return Integer with
Global => null;
function "/" (Left : Time_Span; Right : Integer) return Time_Span with
Global => null;
function "abs" (Right : Time_Span) return Time_Span with
Global => null;
function "<" (Left, Right : Time_Span) return Boolean with
Global => null;
function "<=" (Left, Right : Time_Span) return Boolean with
Global => null;
function ">" (Left, Right : Time_Span) return Boolean with
Global => null;
function ">=" (Left, Right : Time_Span) return Boolean with
Global => null;
function To_Duration (TS : Time_Span) return Duration with
Global => null;
function To_Time_Span (D : Duration) return Time_Span with
Global => null;
function Nanoseconds (NS : Integer) return Time_Span with
Global => null;
function Microseconds (US : Integer) return Time_Span with
Global => null;
function Milliseconds (MS : Integer) return Time_Span with
Global => null;
function Seconds (S : Integer) return Time_Span with
Global => null;
pragma Ada_05 (Seconds);
function Minutes (M : Integer) return Time_Span with
Global => null;
pragma Ada_05 (Minutes);
-- Seconds_Count needs 64 bits. Time is a 64-bits unsigned integer
-- representing clock ticks, and if the clock frequency is lower than
-- 2 ** 32 Hz (~ 4 GHz), which is the case so far, we need more than 32
-- bits to represent the number of seconds. Additionally, Time is
-- unsigned, so Seconds_Count is always positive.
type Seconds_Count is range 0 .. 2 ** 63 - 1;
procedure Split (T : Time; SC : out Seconds_Count; TS : out Time_Span) with
Global => null;
function Time_Of (SC : Seconds_Count; TS : Time_Span) return Time with
Global => null;
private
pragma SPARK_Mode (Off);
type Time is new System.OS_Interface.Time;
Time_First : constant Time := Time'First;
Time_Last : constant Time := Time'Last;
type Time_Span is new System.OS_Interface.Time_Span;
Time_Span_First : constant Time_Span := Time_Span'First;
Time_Span_Last : constant Time_Span := Time_Span'Last;
Time_Span_Zero : constant Time_Span := 0;
Time_Span_Unit : constant Time_Span := 1;
Tick : constant Time_Span := 1;
pragma Import (Intrinsic, "<");
pragma Import (Intrinsic, "<=");
pragma Import (Intrinsic, ">");
pragma Import (Intrinsic, ">=");
pragma Import (Intrinsic, "abs");
pragma Inline (Microseconds);
pragma Inline (Milliseconds);
pragma Inline (Nanoseconds);
pragma Inline (Seconds);
pragma Inline (Minutes);
end Ada.Real_Time;
|