| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS -- |
| -- -- |
| -- S Y S T E M . T A S K I N G . T A S K _ A T T R I B U T E S -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1991-1994, Florida State University -- |
| -- Copyright (C) 1995-2003, Ada Core Technologies -- |
| -- -- |
| -- 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, 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. -- |
| -- -- |
| -- GNARL was developed by the GNARL team at Florida State University. -- |
| -- Extensive contributions were provided by Ada Core Technologies, Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with System.Storage_Elements; |
| -- used for To_Address |
| |
| with System.Task_Primitives.Operations; |
| -- used for Write_Lock |
| -- Unlock |
| -- Lock/Unlock_RTS |
| |
| with System.Tasking.Initialization; |
| -- used for Defer_Abort |
| -- Undefer_Abort |
| |
| with Unchecked_Conversion; |
| |
| package body System.Tasking.Task_Attributes is |
| |
| use Task_Primitives.Operations; |
| use Tasking.Initialization; |
| |
| function To_Access_Node is new Unchecked_Conversion |
| (Access_Address, Access_Node); |
| -- Tetch pointer to indirect attribute list |
| |
| function To_Access_Address is new Unchecked_Conversion |
| (Access_Node, Access_Address); |
| -- Store pointer to indirect attribute list |
| |
| -------------- |
| -- Finalize -- |
| -------------- |
| |
| procedure Finalize (X : in out Instance) is |
| Q, To_Be_Freed : Access_Node; |
| |
| begin |
| Defer_Abortion; |
| Lock_RTS; |
| |
| -- Remove this instantiation from the list of all instantiations. |
| |
| declare |
| P : Access_Instance; |
| Q : Access_Instance := All_Attributes; |
| |
| begin |
| while Q /= null and then Q /= X'Unchecked_Access loop |
| P := Q; Q := Q.Next; |
| end loop; |
| |
| pragma Assert (Q /= null); |
| |
| if P = null then |
| All_Attributes := Q.Next; |
| else |
| P.Next := Q.Next; |
| end if; |
| end; |
| |
| if X.Index /= 0 then |
| -- Free location of this attribute, for reuse. |
| |
| In_Use := In_Use and not (2**Natural (X.Index)); |
| |
| -- There is no need for finalization in this case, |
| -- since controlled types are too big to fit in the TCB. |
| |
| else |
| -- Remove nodes for this attribute from the lists of |
| -- all tasks, and deallocate the nodes. |
| -- Deallocation does finalization, if necessary. |
| |
| declare |
| C : System.Tasking.Task_ID := All_Tasks_List; |
| P : Access_Node; |
| |
| begin |
| while C /= null loop |
| Write_Lock (C); |
| |
| Q := To_Access_Node (C.Indirect_Attributes); |
| while Q /= null |
| and then Q.Instance /= X'Unchecked_Access |
| loop |
| P := Q; |
| Q := Q.Next; |
| end loop; |
| |
| if Q /= null then |
| if P = null then |
| C.Indirect_Attributes := To_Access_Address (Q.Next); |
| else |
| P.Next := Q.Next; |
| end if; |
| |
| -- Can't Deallocate now since we are holding RTS_Lock. |
| |
| Q.Next := To_Be_Freed; |
| To_Be_Freed := Q; |
| end if; |
| |
| Unlock (C); |
| C := C.Common.All_Tasks_Link; |
| end loop; |
| end; |
| end if; |
| |
| Unlock_RTS; |
| |
| while To_Be_Freed /= null loop |
| Q := To_Be_Freed; |
| To_Be_Freed := To_Be_Freed.Next; |
| X.Deallocate.all (Q); |
| end loop; |
| |
| Undefer_Abortion; |
| |
| exception |
| when others => |
| null; |
| pragma Assert (False, |
| "Exception in task attribute instance finalization"); |
| end Finalize; |
| |
| ------------------------- |
| -- Finalize Attributes -- |
| ------------------------- |
| |
| -- This is to be called just before the ATCB is deallocated. |
| -- It relies on the caller holding T.L write-lock on entry. |
| |
| procedure Finalize_Attributes (T : Task_ID) is |
| P : Access_Node; |
| Q : Access_Node := To_Access_Node (T.Indirect_Attributes); |
| |
| begin |
| -- Deallocate all the indirect attributes of this task. |
| |
| while Q /= null loop |
| P := Q; |
| Q := Q.Next; P.Instance.Deallocate.all (P); |
| end loop; |
| |
| T.Indirect_Attributes := null; |
| |
| exception |
| when others => |
| null; |
| pragma Assert (False, |
| "Exception in per-task attributes finalization"); |
| end Finalize_Attributes; |
| |
| --------------------------- |
| -- Initialize Attributes -- |
| --------------------------- |
| |
| -- This is to be called by System.Tasking.Stages.Create_Task. |
| |
| procedure Initialize_Attributes (T : Task_ID) is |
| P : Access_Instance; |
| begin |
| Defer_Abortion; |
| Lock_RTS; |
| |
| -- Initialize all the direct-access attributes of this task. |
| |
| P := All_Attributes; |
| |
| while P /= null loop |
| if P.Index /= 0 then |
| T.Direct_Attributes (P.Index) := |
| Direct_Attribute_Element |
| (System.Storage_Elements.To_Address (P.Initial_Value)); |
| end if; |
| |
| P := P.Next; |
| end loop; |
| |
| Unlock_RTS; |
| Undefer_Abortion; |
| |
| exception |
| when others => |
| null; |
| pragma Assert (False); |
| end Initialize_Attributes; |
| |
| end System.Tasking.Task_Attributes; |
