------------------------------------------------------------------------------ -- -- -- 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) 1999-2018, Free Software Foundation, Inc. -- -- -- -- GNARL 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 -- -- . -- -- -- -- GNARL was developed by the GNARL team at Florida State University. -- -- Extensive contributions were provided by Ada Core Technologies, Inc. -- -- -- ------------------------------------------------------------------------------ -- This is a Darwin Threads 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. with Interfaces.C.Extensions; package body System.OS_Interface is use Interfaces.C; ----------------- -- 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_Target_Priority -- ------------------------ function To_Target_Priority (Prio : System.Any_Priority) return Interfaces.C.int is begin return Interfaces.C.int (Prio); end To_Target_Priority; ----------------- -- 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); -- Darwin Threads 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; ------------------ -- clock_getres -- ------------------ function clock_getres (clock_id : clockid_t; res : access timespec) return int is pragma Unreferenced (clock_id); -- Darwin Threads don't have clock_getres. Nano : constant := 10**9; nsec : int := 0; Result : int := -1; function clock_get_res return int; pragma Import (C, clock_get_res, "__gnat_clock_get_res"); begin nsec := clock_get_res; res.all := To_Timespec (Duration (0.0) + Duration (nsec) / Nano); if nsec > 0 then Result := 0; end if; return Result; end clock_getres; ----------------- -- sched_yield -- ----------------- function sched_yield return int is procedure sched_yield_base (arg : System.Address); pragma Import (C, sched_yield_base, "pthread_yield_np"); begin sched_yield_base (System.Null_Address); return 0; end sched_yield; ------------------ -- pthread_init -- ------------------ procedure pthread_init is begin null; end pthread_init; -------------------- -- Get_Stack_Base -- -------------------- function Get_Stack_Base (thread : pthread_t) return Address is pragma Unreferenced (thread); begin return System.Null_Address; end Get_Stack_Base; end System.OS_Interface;