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-------------------------------------------------------------------------------
--- --
--- 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) 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- --
--- 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, 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, --
--- 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. --
--- --
-------------------------------------------------------------------------------
-
--- This package provides support for the body of Ada.Task_Attributes
-
-with Ada.Finalization;
-
-with System.Storage_Elements;
-
-package System.Tasking.Task_Attributes is
-
- type Attribute is new Integer;
- -- A stand-in for the generic formal type of Ada.Task_Attributes
- -- in the following declarations.
-
- type Node;
- type Access_Node is access all Node;
- -- This needs comments ???
-
- function To_Access_Node is new Ada.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;
- -- 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
-
- type Instance;
-
- type Access_Instance is access all Instance;
-
- type Instance is new Ada.Finalization.Limited_Controlled with record
- Deallocate : Deallocator;
- 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.
-
- Next : Access_Instance;
- -- Next instance in All_Attributes list
- end record;
-
- procedure Finalize (X : in out Instance);
-
- type Node is record
- Wrapper : Access_Dummy_Wrapper;
- Instance : Access_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.
-
- type Dummy_Wrapper is record
- 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;
- -- 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.
-
- 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);
- -- 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, abort must be deferred
- -- and T.L must be write-locked.
-
-end System.Tasking.Task_Attributes;