------------------------------------------------------------------------------
-- --
--- 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 --
-- --
-- S p e c --
-- --
--- Copyright (C) 1995-2002 Florida State University --
+-- Copyright (C) 1991-1994, Florida State University --
+-- Copyright (C) 1995-2005, 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. --
-- --
------------------------------------------------------------------------------
--- This package provides support for the body of Ada.Task_Attributes.
+-- This package provides support for the body of Ada.Task_Attributes
with Ada.Finalization;
--- used for Limited_Controlled
+-- Used for Limited_Controlled
with System.Storage_Elements;
--- used for Integer_Address
+-- Used for Integer_Address
package System.Tasking.Task_Attributes is
type Access_Node is access all Node;
-- This needs comments ???
+ function To_Access_Node is new Unchecked_Conversion
+ (Access_Address, Access_Node);
+ -- Used to fetch pointer to indirect attribute list. Declaration is in
+ -- spec to avoid any problems with aliasing assumptions.
+
type Dummy_Wrapper;
type Access_Dummy_Wrapper is access all Dummy_Wrapper;
+ pragma No_Strict_Aliasing (Access_Dummy_Wrapper);
+ -- Needed to avoid possible incorrect aliasing situations from
+ -- instantiation of Unchecked_Conversion in body of Ada.Task_Attributes.
+
for Access_Dummy_Wrapper'Storage_Size use 0;
- -- This is a stand-in for the generic type Wrapper defined in
- -- Ada.Task_Attributes. The real objects allocated are always
+ -- Access_Dummy_Wrapper is a stand-in for the generic type Wrapper defined
+ -- in Ada.Task_Attributes. The real objects allocated are always
-- of type Wrapper, no Dummy_Wrapper objects are ever created.
type Deallocator is access procedure (P : in out Access_Node);
- -- Called to deallocate an Wrapper. P is a pointer to a Node within.
+ -- Called to deallocate an Wrapper. P is a pointer to a Node within
type Instance;
Initial_Value : aliased System.Storage_Elements.Integer_Address;
Index : Direct_Index;
- -- The index of the TCB location used by this instantiation,
- -- if it is stored in the TCB, otherwise zero.
+ -- The index of the TCB location used by this instantiation, if it is
+ -- stored in the TCB, otherwise zero.
Next : Access_Instance;
- -- Next instance in All_Attributes list.
+ -- Next instance in All_Attributes list
end record;
procedure Finalize (X : in out Instance);
Next : Access_Node;
end record;
- -- The following type is a stand-in for the actual
- -- wrapper type, which is different for each instantiation
- -- of Ada.Task_Attributes.
+ -- The following type is a stand-in for the actual wrapper type, which is
+ -- different for each instantiation of Ada.Task_Attributes.
type Dummy_Wrapper is record
- Noed : aliased Node;
+ Dummy_Node : aliased Node;
Value : aliased Attribute;
-- The generic formal type, may be controlled
end record;
+ for Dummy_Wrapper'Alignment use Standard'Maximum_Alignment;
+ -- A number of unchecked conversions involving Dummy_Wrapper_Access
+ -- sources are performed in other units (e.g. Ada.Task_Attributes).
+ -- Ensure that the designated object is always strictly enough aligned.
+
In_Use : Direct_Index_Vector := 0;
- -- is True for direct indices that are already used.
+ -- Set True for direct indices that are already used (True??? type???)
All_Attributes : Access_Instance;
- -- A linked list of all indirectly access attributes,
- -- which includes all those that require finalization.
+ -- A linked list of all indirectly access attributes, which includes all
+ -- those that require finalization.
- procedure Initialize_Attributes (T : Task_ID);
- -- Initialize all attributes created via Ada.Task_Attributes for T.
- -- This must be called by the creator of the task, inside Create_Task,
- -- via soft-link Initialize_Attributes_Link. On entry, abortion must
- -- be deferred and the caller must hold no locks
+ procedure Initialize_Attributes (T : Task_Id);
+ -- Initialize all attributes created via Ada.Task_Attributes for T. This
+ -- must be called by the creator of the task, inside Create_Task, via
+ -- soft-link Initialize_Attributes_Link. On entry, abort must be deferred
+ -- and the caller must hold no locks
- procedure Finalize_Attributes (T : Task_ID);
+ procedure Finalize_Attributes (T : Task_Id);
-- Finalize all attributes created via Ada.Task_Attributes for T.
-- This is to be called by the task after it is marked as terminated
-- (and before it actually dies), inside Vulnerable_Free_Task, via the
- -- soft-link Finalize_Attributes_Link. On entry, abortion must be deferred
+ -- soft-link Finalize_Attributes_Link. On entry, abort must be deferred
-- and T.L must be write-locked.
end System.Tasking.Task_Attributes;
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