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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . T H R E A D S . I N I T I A L I Z A T I O N --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2003 Free Software Foundation, Inc. --
-- --
-- GNAT 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. 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, 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. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This is the VxWorks version of this package; to use this implementation,
-- the task hook libraries should be included in the VxWorks kernel.
with System.Secondary_Stack;
with Interfaces.C;
with Unchecked_Conversion;
package body System.Threads.Initialization is
use Interfaces.C;
package SSS renames System.Secondary_Stack;
procedure Initialize_Task_Hooks;
-- Register the appropriate hooks (Register and Reset_TSD) to the
-- underlying OS, so that they will be called when a task is created
-- or reset.
Current_ATSD : aliased System.Address;
pragma Import (C, Current_ATSD, "__gnat_current_atsd");
---------------------------
-- Initialize_Task_Hooks --
---------------------------
procedure Initialize_Task_Hooks is separate;
-- Separate, as these hooks are different for AE653 and VxWorks 5.5.
--------------
-- Register --
--------------
function Register (T : OSI.Thread_Id) return OSI.STATUS is
TSD : ATSD_Access := new ATSD;
Result : OSI.STATUS;
begin
-- It cannot be assumed that the caller of this routine has a ATSD;
-- so neither this procedure nor the procedures that it calls should
-- raise or handle exceptions, or make use of a secondary stack.
if OSI.taskIdVerify (T) = OSI.ERROR
or else OSI.taskVarGet (T, Current_ATSD'Access) /= OSI.ERROR
then
return OSI.ERROR;
end if;
Result := OSI.taskVarAdd (T, Current_ATSD'Access);
pragma Assert (Result /= -1);
Result := OSI.taskVarSet (T, Current_ATSD'Access, TSD.all'Address);
pragma Assert (Result /= -1);
TSD.Sec_Stack_Addr := SSS.SS_Create;
SSS.SS_Init (TSD.Sec_Stack_Addr);
return Result;
end Register;
---------------
-- Reset_TSD --
---------------
function Reset_TSD (T : OSI.Thread_Id) return OSI.STATUS is
TSD_Ptr : int;
function To_Address is new Unchecked_Conversion
(Interfaces.C.int, ATSD_Access);
begin
TSD_Ptr := OSI.taskVarGet (T, Current_ATSD'Access);
pragma Assert (TSD_Ptr /= OSI.ERROR);
-- Just reset the secondary stack pointer. The implementation here
-- assumes that the fixed secondary stack implementation is used.
-- If not, there will be a memory leak (along with allocation, which
-- is prohibited for ARINC processes once the system enters "normal"
-- mode).
SSS.SS_Init (To_Address (TSD_Ptr).Sec_Stack_Addr);
return OSI.OK;
end Reset_TSD;
begin
Initialize_Task_Hooks;
end System.Threads.Initialization;
|
