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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . E X E C U T I O N _ T I M E --
-- --
-- B o d y --
-- --
-- Copyright (C) 2007-2010, 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/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This is the POSIX (Realtime Extension) version of this package
with Ada.Task_Identification; use Ada.Task_Identification;
with Ada.Unchecked_Conversion;
with System.OS_Interface; use System.OS_Interface;
with Interfaces.C; use Interfaces.C;
package body Ada.Execution_Time is
pragma Linker_Options ("-lrt");
-- POSIX.1b Realtime Extensions library. Needed to have access to function
-- clock_gettime.
---------
-- "+" --
---------
function "+"
(Left : CPU_Time;
Right : Ada.Real_Time.Time_Span) return CPU_Time
is
use type Ada.Real_Time.Time;
begin
return CPU_Time (Ada.Real_Time.Time (Left) + Right);
end "+";
function "+"
(Left : Ada.Real_Time.Time_Span;
Right : CPU_Time) return CPU_Time
is
use type Ada.Real_Time.Time;
begin
return CPU_Time (Left + Ada.Real_Time.Time (Right));
end "+";
---------
-- "-" --
---------
function "-"
(Left : CPU_Time;
Right : Ada.Real_Time.Time_Span) return CPU_Time
is
use type Ada.Real_Time.Time;
begin
return CPU_Time (Ada.Real_Time.Time (Left) - Right);
end "-";
function "-"
(Left : CPU_Time;
Right : CPU_Time) return Ada.Real_Time.Time_Span
is
use type Ada.Real_Time.Time;
begin
return (Ada.Real_Time.Time (Left) - Ada.Real_Time.Time (Right));
end "-";
-----------
-- Clock --
-----------
function Clock
(T : Ada.Task_Identification.Task_Id :=
Ada.Task_Identification.Current_Task)
return CPU_Time
is
TS : aliased timespec;
Result : Interfaces.C.int;
function To_CPU_Time is
new Ada.Unchecked_Conversion (Duration, CPU_Time);
-- Time is equal to Duration (although it is a private type) and
-- CPU_Time is equal to Time.
function clock_gettime
(clock_id : Interfaces.C.int;
tp : access timespec)
return int;
pragma Import (C, clock_gettime, "clock_gettime");
-- Function from the POSIX.1b Realtime Extensions library
CLOCK_THREAD_CPUTIME_ID : constant := 3;
-- Identifier for the clock returning per-task CPU time
begin
if T = Ada.Task_Identification.Null_Task_Id then
raise Program_Error;
end if;
Result := clock_gettime
(clock_id => CLOCK_THREAD_CPUTIME_ID, tp => TS'Unchecked_Access);
pragma Assert (Result = 0);
return To_CPU_Time (To_Duration (TS));
end Clock;
-----------
-- Split --
-----------
procedure Split
(T : CPU_Time;
SC : out Ada.Real_Time.Seconds_Count;
TS : out Ada.Real_Time.Time_Span)
is
use type Ada.Real_Time.Time;
begin
Ada.Real_Time.Split (Ada.Real_Time.Time (T), SC, TS);
end Split;
-------------
-- Time_Of --
-------------
function Time_Of
(SC : Ada.Real_Time.Seconds_Count;
TS : Ada.Real_Time.Time_Span := Ada.Real_Time.Time_Span_Zero)
return CPU_Time
is
begin
return CPU_Time (Ada.Real_Time.Time_Of (SC, TS));
end Time_Of;
end Ada.Execution_Time;
|
