+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- 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 --
--- --
--- S p e c --
--- --
--- $Revision: 1.1 $
--- --
--- Copyright (C) 1995-2000 Florida State University --
--- --
--- 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. It is --
--- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
--- State University (http://www.gnat.com). --
--- --
-------------------------------------------------------------------------------
-
--- This package provides support for the body of Ada.Task_Attributes.
-
-with Ada.Finalization;
--- used for Limited_Controlled
-
-with System.Storage_Elements;
--- used for Integer_Address
-
-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;
- type Dummy_Wrapper;
- type Access_Dummy_Wrapper is access all Dummy_Wrapper;
-
- 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
- Noed : aliased Node;
-
- Value : aliased Attribute;
- -- The generic formal type, may be controlled
- end record;
-
- In_Use : Direct_Index_Vector := 0;
- -- is True for direct indices that are already used.
-
- All_Attributes : Access_Instance;
- -- A linked list of all indirectly access attributes,
- -- which includes all those that require finalization.
-
- All_Attrs_L : aliased System.Task_Primitives.RTS_Lock;
- -- Protects In_Use, Next_Indirect_Index, and All_Attributes.
- -- Deadlock prevention order of locking:
- -- 1) All_Attrs_L
- -- 2) All_Tasks_L
- -- 3) any TCB.L
-
- 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 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
- -- and T.L must be write-locked.
-
-end System.Tasking.Task_Attributes;
projects / msp430-gcc.git / blobdiff