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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) 1998-2007, 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 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;