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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) 1998-2009, 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 the DEC Unix version of this package
-- This package encapsulates all direct interfaces to OS services
-- that are needed by children of System.
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; use Interfaces.C;
with System.Machine_Code; use System.Machine_Code;
package body System.OS_Interface is
--------------------
-- Get_Stack_Base --
--------------------
function Get_Stack_Base (thread : pthread_t) return Address is
pragma Unreferenced (thread);
begin
return Null_Address;
end Get_Stack_Base;
------------------
-- pthread_init --
------------------
procedure pthread_init is
begin
null;
end pthread_init;
------------------
-- pthread_self --
------------------
function pthread_self return pthread_t is
Self : pthread_t;
begin
Asm ("call_pal 0x9e" & ASCII.LF & ASCII.HT &
"bis $31, $0, %0",
Outputs => pthread_t'Asm_Output ("=r", Self),
Clobber => "$0",
Volatile => True);
return Self;
end pthread_self;
----------------------
-- Hide_Yellow_Zone --
----------------------
procedure Hide_Unhide_Yellow_Zone (Hide : Boolean) is
type Teb_Ptr is access all pthread_teb_t;
Teb : Teb_Ptr;
Res : Interfaces.C.int;
pragma Unreferenced (Res);
begin
-- Get the Thread Environment Block address
Asm ("call_pal 0x9e" & ASCII.LF & ASCII.HT &
"bis $31, $0, %0",
Outputs => Teb_Ptr'Asm_Output ("=r", Teb),
Clobber => "$0",
Volatile => True);
-- Stick a guard page right above the Yellow Zone if it exists
if Teb.all.stack_yellow /= Teb.all.stack_guard then
if Hide then
Res := mprotect (Teb.all.stack_yellow, Get_Page_Size, PROT_ON);
else
Res := mprotect (Teb.all.stack_yellow, Get_Page_Size, PROT_OFF);
end if;
end if;
end Hide_Unhide_Yellow_Zone;
-----------------
-- 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_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;
end System.OS_Interface;
|
