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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) 1997-2007, 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 2, or (at your option) any later ver- --
-- sion. GNARL 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNARL; see file COPYING. If not, write --
-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- 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");
begin
-- For the case SCHED_OTHER the only valid priority across all supported
-- versions of AIX is 1. 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 = ' ' 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;
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