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a-reatim.adb
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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- A D A . R E A L _ T I M E --
-- --
-- B o d y --
-- --
-- Copyright (C) 1991-1994, Florida State University --
-- Copyright (C) 1995-2010, AdaCore --
-- Copyright (C) 2016, 2017 Free Software Foundation Inc. --
-- --
-- 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/>. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. --
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
with Interfaces;
with System.FreeRTOS.Tasks;
package body Ada.Real_Time
with SPARK_Mode => Off
is
---------
-- "*" --
---------
-- Note that Constraint_Error may be propagated
function "*" (Left : Time_Span; Right : Integer) return Time_Span is
pragma Unsuppress (Overflow_Check);
begin
return Time_Span (Duration (Left) * Right);
end "*";
function "*" (Left : Integer; Right : Time_Span) return Time_Span is
pragma Unsuppress (Overflow_Check);
begin
return Time_Span (Left * Duration (Right));
end "*";
---------
-- "+" --
---------
-- Note that Constraint_Error may be propagated
function "+" (Left : Time; Right : Time_Span) return Time is
pragma Unsuppress (Overflow_Check);
begin
return Left + To_Time (Right);
end "+";
function "+" (Left : Time_Span; Right : Time) return Time is
pragma Unsuppress (Overflow_Check);
begin
return To_Time (Left) + Right;
end "+";
function "+" (Left, Right : Time_Span) return Time_Span is
pragma Unsuppress (Overflow_Check);
begin
return Time_Span (Duration (Left) + Duration (Right));
end "+";
---------
-- "-" --
---------
-- Note that Constraint_Error may be propagated
function "-" (Left : Time; Right : Time_Span) return Time is
pragma Unsuppress (Overflow_Check);
begin
return Left - To_Time (Right);
end "-";
function "-" (Left, Right : Time) return Time_Span is
pragma Unsuppress (Overflow_Check);
begin
return To_Time_Span (Left - Right);
end "-";
function "-" (Left, Right : Time_Span) return Time_Span is
pragma Unsuppress (Overflow_Check);
begin
return Time_Span (Duration (Left) - Duration (Right));
end "-";
function "-" (Right : Time_Span) return Time_Span is
pragma Unsuppress (Overflow_Check);
begin
return Time_Span_Zero - Right;
end "-";
---------
-- "/" --
---------
-- Note that Constraint_Error may be propagated
function "/" (Left, Right : Time_Span) return Integer is
pragma Unsuppress (Overflow_Check);
begin
return Integer (Standard."/" (Left, Right));
end "/";
function "/" (Left : Time_Span; Right : Integer) return Time_Span is
pragma Unsuppress (Overflow_Check);
begin
return Time_Span (Duration (Left) / Right);
end "/";
-----------
-- Clock --
-----------
function Clock return Time is
-- This is a simple-minded version, which is only valid up to
-- 2**32 / (FreeRTOS_Tick_Rate, typically 1000) seconds from
-- system startup. This is approximately 50 days.
-- FreeRTOSConfig.h has set configUSE_16_BIT_TICKS to 0 (so we
-- get 32-bit ticks) and configTICK_RATE_HZ to (typically) 1000.
function xTaskGetTickCount return Interfaces.Unsigned_32
with
Import,
Convention => C,
External_Name => "xTaskGetTickCount";
function xTaskGetTickCountFromISR return Interfaces.Unsigned_32
with
Import,
Convention => C,
External_Name => "xTaskGetTickCountFromISR";
begin
return Time (if System.FreeRTOS.Tasks.In_ISR
then xTaskGetTickCountFromISR
else xTaskGetTickCount);
end Clock;
------------------
-- Microseconds --
------------------
function Microseconds (US : Integer) return Time_Span is
begin
return Time_Span (US) / 1_000_000;
end Microseconds;
------------------
-- Milliseconds --
------------------
function Milliseconds (MS : Integer) return Time_Span is
begin
return Time_Span (MS) / 1_000;
end Milliseconds;
-------------
-- Minutes --
-------------
function Minutes (M : Integer) return Time_Span is
begin
return Milliseconds (M) * Integer'(60_000);
end Minutes;
-----------------
-- Nanoseconds --
-----------------
function Nanoseconds (NS : Integer) return Time_Span is
begin
return Time_Span (NS) / 1_000_000_000;
end Nanoseconds;
-------------
-- Seconds --
-------------
function Seconds (S : Integer) return Time_Span is
begin
return Milliseconds (S) * Integer'(1000);
end Seconds;
-----------
-- Split --
-----------
procedure Split (T : Time; SC : out Seconds_Count; TS : out Time_Span) is
T_Val : constant Time_Span := To_Time_Span (T);
begin
-- Extract the integer part of T, truncating towards zero
SC := (if T_Val < 0.5 then 0 else Seconds_Count (T_Val - 0.5));
TS := T_Val - Time_Span (SC);
end Split;
-------------
-- Time_Of --
-------------
function Time_Of (SC : Seconds_Count; TS : Time_Span) return Time is
begin
return Time (SC) + TS;
end Time_Of;
-----------------
-- To_Duration --
-----------------
function To_Duration (TS : Time_Span) return Duration is
pragma Unsuppress (Overflow_Check);
begin
return Duration (TS);
end To_Duration;
------------------
-- To_Time_Span --
------------------
function To_Time_Span (D : Duration) return Time_Span is
begin
-- Note regarding AI-00432 requiring range checking on this
-- conversion. The range of Time_Span is greater than that of
-- Duration, so there is no issue of overflow.
return Time_Span (D);
end To_Time_Span;
-- begin
-- Ensure that the tasking run time is initialized when using clock and/or
-- delay operations. The initialization routine has the required machinery
-- to prevent multiple calls to Initialize.
-- System.Tasking.Initialize;
end Ada.Real_Time;