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Diffstat (limited to 'gcc/ada/5zthrini.adb')
| -rw-r--r-- | gcc/ada/5zthrini.adb | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/gcc/ada/5zthrini.adb b/gcc/ada/5zthrini.adb new file mode 100644 index 00000000000..ded9a5118bb --- /dev/null +++ b/gcc/ada/5zthrini.adb @@ -0,0 +1,113 @@ +------------------------------------------------------------------------------ +-- -- +-- 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; |