1 ------------------------------------------------------------------------------
3 -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- 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 --
11 -- Copyright (C) 1995-2002 Florida State University --
13 -- GNARL is free software; you can redistribute it and/or modify it under --
14 -- terms of the GNU General Public License as published by the Free Soft- --
15 -- ware Foundation; either version 2, or (at your option) any later ver- --
16 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
17 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
18 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
19 -- for more details. You should have received a copy of the GNU General --
20 -- Public License distributed with GNARL; see file COPYING. If not, write --
21 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
22 -- MA 02111-1307, USA. --
24 -- As a special exception, if other files instantiate generics from this --
25 -- unit, or you link this unit with other files to produce an executable, --
26 -- this unit does not by itself cause the resulting executable to be --
27 -- covered by the GNU General Public License. This exception does not --
28 -- however invalidate any other reasons why the executable file might be --
29 -- covered by the GNU Public License. --
31 -- GNARL was developed by the GNARL team at Florida State University. It is --
32 -- now maintained by Ada Core Technologies, Inc. (http://www.gnat.com). --
34 ------------------------------------------------------------------------------
36 -- This package provides support for the body of Ada.Task_Attributes.
38 with Ada.Finalization;
39 -- used for Limited_Controlled
41 with System.Storage_Elements;
42 -- used for Integer_Address
44 package System.Tasking.Task_Attributes is
46 type Attribute is new Integer;
47 -- A stand-in for the generic formal type of Ada.Task_Attributes
48 -- in the following declarations.
51 type Access_Node is access all Node;
52 -- This needs comments ???
55 type Access_Dummy_Wrapper is access all Dummy_Wrapper;
56 for Access_Dummy_Wrapper'Storage_Size use 0;
57 -- This is a stand-in for the generic type Wrapper defined in
58 -- Ada.Task_Attributes. The real objects allocated are always
59 -- of type Wrapper, no Dummy_Wrapper objects are ever created.
61 type Deallocator is access procedure (P : in out Access_Node);
62 -- Called to deallocate an Wrapper. P is a pointer to a Node within.
66 type Access_Instance is access all Instance;
68 type Instance is new Ada.Finalization.Limited_Controlled with record
69 Deallocate : Deallocator;
70 Initial_Value : aliased System.Storage_Elements.Integer_Address;
73 -- The index of the TCB location used by this instantiation,
74 -- if it is stored in the TCB, otherwise zero.
76 Next : Access_Instance;
77 -- Next instance in All_Attributes list.
80 procedure Finalize (X : in out Instance);
83 Wrapper : Access_Dummy_Wrapper;
84 Instance : Access_Instance;
88 -- The following type is a stand-in for the actual
89 -- wrapper type, which is different for each instantiation
90 -- of Ada.Task_Attributes.
92 type Dummy_Wrapper is record
95 Value : aliased Attribute;
96 -- The generic formal type, may be controlled
99 In_Use : Direct_Index_Vector := 0;
100 -- is True for direct indices that are already used.
102 All_Attributes : Access_Instance;
103 -- A linked list of all indirectly access attributes,
104 -- which includes all those that require finalization.
106 procedure Initialize_Attributes (T : Task_ID);
107 -- Initialize all attributes created via Ada.Task_Attributes for T.
108 -- This must be called by the creator of the task, inside Create_Task,
109 -- via soft-link Initialize_Attributes_Link. On entry, abortion must
110 -- be deferred and the caller must hold no locks
112 procedure Finalize_Attributes (T : Task_ID);
113 -- Finalize all attributes created via Ada.Task_Attributes for T.
114 -- This is to be called by the task after it is marked as terminated
115 -- (and before it actually dies), inside Vulnerable_Free_Task, via the
116 -- soft-link Finalize_Attributes_Link. On entry, abortion must be deferred
117 -- and T.L must be write-locked.
119 end System.Tasking.Task_Attributes;