| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- |
| -- -- |
| -- S Y S T E M . O S _ I N T E R F A C E -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1995-2014, AdaCore -- |
| -- -- |
| -- 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. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This is an Android version of this package. |
| |
| pragma Polling (Off); |
| -- Turn off polling, we do not want ATC polling to take place during |
| -- tasking operations. It causes infinite loops and other problems. |
| |
| -- This package encapsulates all direct interfaces to OS services |
| -- that are needed by children of System. |
| |
| with Interfaces.C; use Interfaces.C; |
| with Interfaces.C.Extensions; use Interfaces.C.Extensions; |
| |
| package body System.OS_Interface is |
| |
| ----------------- |
| -- To_Duration -- |
| ----------------- |
| |
| function To_Duration (TS : timespec) return Duration is |
| begin |
| return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9; |
| end To_Duration; |
| |
| ----------------- |
| -- To_Timespec -- |
| ----------------- |
| |
| function To_Timespec (D : Duration) return timespec is |
| S : time_t; |
| F : Duration; |
| |
| begin |
| S := time_t (Long_Long_Integer (D)); |
| F := D - Duration (S); |
| |
| -- If F has negative value due to a round-up, adjust for positive F |
| -- value. |
| |
| if F < 0.0 then |
| S := S - 1; |
| F := F + 1.0; |
| end if; |
| |
| return timespec'(tv_sec => S, |
| tv_nsec => long (Long_Long_Integer (F * 10#1#E9))); |
| end To_Timespec; |
| |
| ------------------- |
| -- clock_gettime -- |
| ------------------- |
| |
| function clock_gettime |
| (clock_id : clockid_t; |
| tp : access timespec) return int |
| is |
| pragma Unreferenced (clock_id); |
| |
| -- Android/Linux don't have clock_gettime, so use gettimeofday |
| |
| use Interfaces; |
| |
| type timeval is array (1 .. 3) of C.long; |
| -- The timeval array is sized to contain long_long sec and long usec. |
| -- If long_long'Size = long'Size then it will be overly large but that |
| -- won't effect the implementation since it's not accessed directly. |
| |
| procedure timeval_to_duration |
| (T : not null access timeval; |
| sec : not null access C.Extensions.long_long; |
| usec : not null access C.long); |
| pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration"); |
| |
| Micro : constant := 10**6; |
| sec : aliased C.Extensions.long_long; |
| usec : aliased C.long; |
| TV : aliased timeval; |
| Result : int; |
| |
| function gettimeofday |
| (Tv : access timeval; |
| Tz : System.Address := System.Null_Address) return int; |
| pragma Import (C, gettimeofday, "gettimeofday"); |
| |
| begin |
| Result := gettimeofday (TV'Access, System.Null_Address); |
| pragma Assert (Result = 0); |
| timeval_to_duration (TV'Access, sec'Access, usec'Access); |
| tp.all := To_Timespec (Duration (sec) + Duration (usec) / Micro); |
| return Result; |
| end clock_gettime; |
| |
| end System.OS_Interface; |
