195 lines
6.4 KiB
Ada
195 lines
6.4 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- S Y S T E M . O S _ I N T E R F A C E --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1999-2015, Free Software Foundation, Inc. --
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-- --
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-- GNARL is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. --
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-- Extensive contributions were provided by Ada Core Technologies, Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This is a Darwin Threads version of this package
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pragma Polling (Off);
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-- Turn off polling, we do not want ATC polling to take place during
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-- tasking operations. It causes infinite loops and other problems.
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with Interfaces.C.Extensions;
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package body System.OS_Interface is
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use Interfaces.C;
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use Interfaces.C.Extensions;
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-----------------
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-- To_Duration --
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-----------------
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function To_Duration (TS : timespec) return Duration is
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begin
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return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
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end To_Duration;
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------------------------
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-- To_Target_Priority --
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------------------------
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function To_Target_Priority
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(Prio : System.Any_Priority) return Interfaces.C.int
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is
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begin
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return Interfaces.C.int (Prio);
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end To_Target_Priority;
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-----------------
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-- To_Timespec --
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-----------------
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function To_Timespec (D : Duration) return timespec is
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S : time_t;
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F : Duration;
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begin
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S := time_t (Long_Long_Integer (D));
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F := D - Duration (S);
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-- If F has negative value due to a round-up, adjust for positive F
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-- value.
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if F < 0.0 then
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S := S - 1;
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F := F + 1.0;
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end if;
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return timespec'(tv_sec => S,
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tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
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end To_Timespec;
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-------------------
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-- clock_gettime --
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-------------------
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function clock_gettime
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(clock_id : clockid_t;
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tp : access timespec) return int
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is
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pragma Unreferenced (clock_id);
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-- Darwin Threads don't have clock_gettime, so use gettimeofday
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use Interfaces;
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type timeval is array (1 .. 3) of C.long;
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-- The timeval array is sized to contain long_long sec and long usec.
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-- If long_long'Size = long'Size then it will be overly large but that
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-- won't effect the implementation since it's not accessed directly.
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procedure timeval_to_duration
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(T : not null access timeval;
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sec : not null access C.Extensions.long_long;
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usec : not null access C.long);
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pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration");
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Micro : constant := 10**6;
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sec : aliased C.Extensions.long_long;
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usec : aliased C.long;
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TV : aliased timeval;
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Result : int;
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function gettimeofday
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(Tv : access timeval;
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Tz : System.Address := System.Null_Address) return int;
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pragma Import (C, gettimeofday, "gettimeofday");
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begin
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Result := gettimeofday (TV'Access, System.Null_Address);
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pragma Assert (Result = 0);
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timeval_to_duration (TV'Access, sec'Access, usec'Access);
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tp.all := To_Timespec (Duration (sec) + Duration (usec) / Micro);
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return Result;
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end clock_gettime;
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------------------
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-- clock_getres --
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------------------
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function clock_getres
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(clock_id : clockid_t;
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res : access timespec) return int
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is
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pragma Unreferenced (clock_id);
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-- Darwin Threads don't have clock_getres.
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Nano : constant := 10**9;
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nsec : int := 0;
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Result : int := -1;
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function clock_get_res return int;
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pragma Import (C, clock_get_res, "__gnat_clock_get_res");
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begin
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nsec := clock_get_res;
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res.all := To_Timespec (Duration (0.0) + Duration (nsec) / Nano);
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if nsec > 0 then
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Result := 0;
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end if;
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return Result;
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end clock_getres;
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-----------------
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-- sched_yield --
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-----------------
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function sched_yield return int is
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procedure sched_yield_base (arg : System.Address);
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pragma Import (C, sched_yield_base, "pthread_yield_np");
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begin
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sched_yield_base (System.Null_Address);
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return 0;
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end sched_yield;
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------------------
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-- pthread_init --
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------------------
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procedure pthread_init is
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begin
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null;
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end pthread_init;
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----------------
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-- Stack_Base --
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----------------
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function Get_Stack_Base (thread : pthread_t) return Address is
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pragma Unreferenced (thread);
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begin
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return System.Null_Address;
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end Get_Stack_Base;
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end System.OS_Interface;
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