143 lines
5.1 KiB
Ada
143 lines
5.1 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- S Y S T E M . O S _ I N T E R F A C E --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1998-2009, Free Software Foundation, Inc. --
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-- --
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-- GNARL is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. --
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-- Extensive contributions were provided by Ada Core Technologies, Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This is the DEC Unix version of this package
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-- This package encapsulates all direct interfaces to OS services
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-- that are needed by children of System.
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pragma Polling (Off);
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-- Turn off polling, we do not want ATC polling to take place during
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-- tasking operations. It causes infinite loops and other problems.
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with Interfaces.C; use Interfaces.C;
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with System.Machine_Code; use System.Machine_Code;
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package body System.OS_Interface is
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--------------------
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-- Get_Stack_Base --
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--------------------
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function Get_Stack_Base (thread : pthread_t) return Address is
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pragma Unreferenced (thread);
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begin
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return Null_Address;
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end Get_Stack_Base;
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------------------
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-- pthread_init --
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------------------
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procedure pthread_init is
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begin
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null;
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end pthread_init;
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------------------
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-- pthread_self --
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------------------
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function pthread_self return pthread_t is
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Self : pthread_t;
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begin
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Asm ("call_pal 0x9e" & ASCII.LF & ASCII.HT &
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"bis $31, $0, %0",
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Outputs => pthread_t'Asm_Output ("=r", Self),
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Clobber => "$0",
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Volatile => True);
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return Self;
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end pthread_self;
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----------------------
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-- Hide_Yellow_Zone --
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----------------------
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procedure Hide_Unhide_Yellow_Zone (Hide : Boolean) is
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type Teb_Ptr is access all pthread_teb_t;
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Teb : Teb_Ptr;
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Res : Interfaces.C.int;
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pragma Unreferenced (Res);
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begin
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-- Get the Thread Environment Block address
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Asm ("call_pal 0x9e" & ASCII.LF & ASCII.HT &
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"bis $31, $0, %0",
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Outputs => Teb_Ptr'Asm_Output ("=r", Teb),
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Clobber => "$0",
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Volatile => True);
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-- Stick a guard page right above the Yellow Zone if it exists
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if Teb.all.stack_yellow /= Teb.all.stack_guard then
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Res :=
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mprotect
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(Teb.all.stack_yellow, Get_Page_Size,
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prot => (if Hide then PROT_ON else PROT_OFF));
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end if;
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end Hide_Unhide_Yellow_Zone;
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-----------------
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-- To_Duration --
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-----------------
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function To_Duration (TS : timespec) return Duration is
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begin
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return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
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end To_Duration;
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-----------------
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-- To_Timespec --
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-----------------
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function To_Timespec (D : Duration) return timespec is
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S : time_t;
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F : Duration;
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begin
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S := time_t (Long_Long_Integer (D));
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F := D - Duration (S);
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-- If F has negative value due to a round-up, adjust for positive F
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-- value.
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if F < 0.0 then
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S := S - 1;
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F := F + 1.0;
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end if;
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return timespec'(tv_sec => S,
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tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
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end To_Timespec;
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end System.OS_Interface;
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