------------------------------------------------------------------------------ -- -- -- 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) 1997-2009, 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 AIX (Native) 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. 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 Dispatching_Policy : Character; pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy"); Time_Slice_Val : Integer; pragma Import (C, Time_Slice_Val, "__gl_time_slice_val"); begin -- For the case SCHED_OTHER the only valid priority across all supported -- versions of AIX is 1 (note that the scheduling policy can be set -- with the pragma Task_Dispatching_Policy or setting the time slice -- value). Otherwise, for SCHED_RR and SCHED_FIFO, the system defines -- priorities in the range 1 .. 127. This means that we must map -- System.Any_Priority in the range 0 .. 126 to 1 .. 127. if Dispatching_Policy = ' ' and then Time_Slice_Val < 0 then return 1; else return Interfaces.C.int (Prio) + 1; end if; 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 is negative 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); -- Older AIX don't have clock_gettime, so use gettimeofday use Interfaces; type timeval is array (1 .. 2) of C.long; procedure timeval_to_duration (T : not null access timeval; sec : not null access C.long; usec : not null access C.long); pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration"); Micro : constant := 10**6; sec : aliased C.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; ----------------- -- sched_yield -- ----------------- -- AIX Thread does not have sched_yield; function sched_yield return int is procedure pthread_yield; pragma Import (C, pthread_yield, "sched_yield"); begin pthread_yield; return 0; end sched_yield; -------------------- -- Get_Stack_Base -- -------------------- function Get_Stack_Base (thread : pthread_t) return Address is pragma Warnings (Off, thread); begin return Null_Address; end Get_Stack_Base; -------------------------- -- PTHREAD_PRIO_INHERIT -- -------------------------- AIX_Version : Integer := 0; -- AIX version in the form xy for AIX version x.y (0 means not set) SYS_NMLN : constant := 32; -- AIX system constant used to define utsname, see sys/utsname.h subtype String_NMLN is String (1 .. SYS_NMLN); type utsname is record sysname : String_NMLN; nodename : String_NMLN; release : String_NMLN; version : String_NMLN; machine : String_NMLN; procserial : String_NMLN; end record; pragma Convention (C, utsname); procedure uname (name : out utsname); pragma Import (C, uname); function PTHREAD_PRIO_INHERIT return int is name : utsname; function Val (C : Character) return Integer; -- Transform a numeric character ('0' .. '9') to an integer --------- -- Val -- --------- function Val (C : Character) return Integer is begin return Character'Pos (C) - Character'Pos ('0'); end Val; -- Start of processing for PTHREAD_PRIO_INHERIT begin if AIX_Version = 0 then -- Set AIX_Version uname (name); AIX_Version := Val (name.version (1)) * 10 + Val (name.release (1)); end if; if AIX_Version < 53 then -- Under AIX < 5.3, PTHREAD_PRIO_INHERIT is defined as 0 in pthread.h return 0; else -- Under AIX >= 5.3, PTHREAD_PRIO_INHERIT is defined as 3 return 3; end if; end PTHREAD_PRIO_INHERIT; end System.OS_Interface;