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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) 1997-2013, 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;
------------------------
-- 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;
-----------------
-- 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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