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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) 2007-2012, 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_Constants; use System.OS_Constants;
+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
+
+ 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;
+
+ --------------------------
+ -- Clock_For_Interrupts --
+ --------------------------
+
+ function Clock_For_Interrupts return CPU_Time is
+ begin
+ -- According to AI 0170-1, D.14(18.1/3), if Interrupt_Clocks_Supported
+ -- is set to False the function raises Program_Error.
+
+ raise Program_Error;
+ return CPU_Time_First;
+ end Clock_For_Interrupts;
+
+ -----------
+ -- 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;