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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 System.Storage_Elements;
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
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.
-- This routine is only necessary because taskVarAdd cannot be
-- executed once an AE653 partition has entered normal mode
-- (depending on configRecord.c, allocation could be disabled).
-- Otherwise, everything could have been done in Thread_Body_Enter.
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 /= OSI.ERROR);
return Result;
end Register;
subtype Default_Sec_Stack is
System.Storage_Elements.Storage_Array
(1 .. SSS.Default_Secondary_Stack_Size);
Main_Sec_Stack : aliased Default_Sec_Stack;
-- Secondary stack for environment task
Main_ATSD : aliased ATSD;
-- TSD for environment task
begin
Initialize_Task_Hooks;
-- Register the environment task
declare
Result : Interfaces.C.int := Register (OSI.taskIdSelf);
pragma Assert (Result /= OSI.ERROR);
begin
Thread_Body_Enter
(Main_Sec_Stack'Address,
Main_Sec_Stack'Size / System.Storage_Unit,
Main_ATSD'Address);
end;
end System.Threads.Initialization;
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