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-------------------------------------------------------------------------------
--- --
--- 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 --
--- <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 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;
-
- function To_Duration (TV : struct_timeval) return Duration is
- begin
- return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
- 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;
-
- ----------------
- -- To_Timeval --
- ----------------
-
- function To_Timeval (D : Duration) return struct_timeval is
- S : long;
- F : Duration;
-
- begin
- S := long (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
- struct_timeval'
- (tv_sec => S,
- tv_usec => long (Long_Long_Integer (F * 10#1#E6)));
- end To_Timeval;
-
- -------------------
- -- clock_gettime --
- -------------------
-
- function clock_gettime
- (clock_id : clockid_t;
- tp : access timespec)
- return int
- is
- pragma Warnings (Off, clock_id);
-
- Result : int;
- tv : aliased struct_timeval;
-
- function gettimeofday
- (tv : access struct_timeval;
- tz : System.Address := System.Null_Address)
- return int;
- pragma Import (C, gettimeofday, "gettimeofday");
-
- begin
- Result := gettimeofday (tv'Unchecked_Access);
- tp.all := To_Timespec (To_Duration (tv));
- 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;