------------------------------------------------------------------------------
-- --
--- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
+-- GNAT 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) 1995-2001 Florida State University --
+-- Copyright (C) 1991-1994, Florida State University --
+-- Copyright (C) 1995-2008, AdaCore --
-- --
-- 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- --
-- 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. --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, 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, --
-- 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. It is --
--- now maintained by Ada Core Technologies, Inc. (http://www.gnat.com). --
+-- 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 Ada.Unchecked_Conversion;
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
+ function To_Access_Address is new Ada.Unchecked_Conversion
(Access_Node, Access_Address);
-- Store pointer to indirect attribute list
procedure Finalize (X : in out Instance) is
Q, To_Be_Freed : Access_Node;
+ Self_Id : constant Task_Id := Self;
begin
- Defer_Abortion;
+ -- Defer abort. Note that we use the nestable versions of Defer_Abort
+ -- and Undefer_Abort, because abort can already deferred when this is
+ -- called during finalization, which would cause an assert failure
+ -- in Defer_Abort.
+
+ Defer_Abort_Nestable (Self_Id);
Lock_RTS;
- -- Remove this instantiation from the list of all instantiations.
+ -- Remove this instantiation from the list of all instantiations
declare
P : Access_Instance;
end;
if X.Index /= 0 then
- -- Free location of this attribute, for reuse.
+
+ -- 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.
+ -- 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.
+ -- 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;
+ C : System.Tasking.Task_Id := All_Tasks_List;
P : Access_Node;
begin
P.Next := Q.Next;
end if;
- -- Can't Deallocate now since we are holding RTS_Lock.
+ -- Can't Deallocate now since we are holding RTS_Lock
Q.Next := To_Be_Freed;
To_Be_Freed := Q;
X.Deallocate.all (Q);
end loop;
- Undefer_Abortion;
+ Undefer_Abort_Nestable (Self_Id);
exception
- when others => null;
+ when others =>
+ null;
pragma Assert (False,
"Exception in task attribute instance finalization");
end Finalize;
-- 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
+ 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.
+ -- Deallocate all the indirect attributes of this task
while Q /= null loop
P := Q;
T.Indirect_Attributes := null;
exception
- when others => null;
+ 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.
- -- It relies on their being no concurrent access to this TCB,
- -- so it does not defer abortion nor lock T.L.
+ -- This is to be called by System.Tasking.Stages.Create_Task
+
+ procedure Initialize_Attributes (T : Task_Id) is
+ P : Access_Instance;
+ Self_Id : constant Task_Id := Self;
- procedure Initialize_Attributes (T : Task_ID) is
- P : Access_Instance;
begin
+ Defer_Abort (Self_Id);
Lock_RTS;
- -- Initialize all the direct-access attributes of this task.
+ -- 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) :=
- System.Storage_Elements.To_Address (P.Initial_Value);
+ Direct_Attribute_Element
+ (System.Storage_Elements.To_Address (P.Initial_Value));
end if;
P := P.Next;
end loop;
Unlock_RTS;
+ Undefer_Abort (Self_Id);
exception
- when others => null;
+ when others =>
+ null;
pragma Assert (False);
end Initialize_Attributes;
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